ch05/07_gpt_to_llama/converting-llama2-to-llama3.ipynb

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   "source": [
    "<table style=\"width:100%\">\n",
    "<tr>\n",
    "<td style=\"vertical-align:middle; text-align:left;\">\n",
    "<font size=\"2\">\n",
    "Supplementary code for the <a href=\"http://mng.bz/orYv\">Build a Large Language Model From Scratch</a> book by <a href=\"https://sebastianraschka.com\">Sebastian Raschka</a><br>\n",
    "<br>Code repository: <a href=\"https://github.com/rasbt/LLMs-from-scratch\">https://github.com/rasbt/LLMs-from-scratch</a>\n",
    "<br>汉化的库: <a href=\"https://github.com/GoatCsu/CN-LLMs-from-scratch.git\">https://github.com/GoatCsu/CN-LLMs-from-scratch.git</a>\n",
    "</font>\n",
    "</td>\n",
    "<td style=\"vertical-align:middle; text-align:left;\">\n",
    "<a href=\"http://mng.bz/orYv\"><img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/cover-small.webp\" width=\"100px\"></a>\n",
    "</td>\n",
    "</tr>\n",
    "</table>\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "l62zIRRSBy_R",
   "metadata": {
    "id": "l62zIRRSBy_R"
   },
   "source": [
    "# 从零开始将 LLaMA 2 转换为 LLaMA 3.2"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "aFmxTQbwCUMl",
   "metadata": {
    "id": "aFmxTQbwCUMl"
   },
   "source": [
    "- 本笔记本是 [《从零开始将 GPT 架构转换为 LLaMA 2》](./converting-gpt-to-llama2.ipynb) 的后续内容，逐步将 **Meta AI 的 LLaMA 2** 模型架构转换为 **LLaMA 3**、**LLaMA 3.1** 和 **LLaMA 3.2**。  \n",
    "- 本笔记本的解释部分被 **有意简化**，以避免过度冗长，并专注于 **主要代码**。  \n",
    "- 如需了解更多架构细节，请参考 **LLaMA 2** 和 **LLaMA 3** 相关论文：  \n",
    "  - [LLaMA 2: 开放基础模型与微调聊天模型（2023）](https://arxiv.org/abs/2307.09288)  \n",
    "  - [LLaMA 3 模型](https://arxiv.org/abs/2407.21783)  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "ohhMKUWvGm9z",
   "metadata": {
    "id": "ohhMKUWvGm9z"
   },
   "source": [
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/gpt2-to-llama2-llama3.webp?1\">"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "ws0wsUzwLH2k",
   "metadata": {
    "id": "ws0wsUzwLH2k"
   },
   "outputs": [],
   "source": [
    "# pip install -r requirements-extra.txt"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "JBpQwU89ETA1",
   "metadata": {
    "id": "JBpQwU89ETA1"
   },
   "source": [
    "- 下面是所需要的库"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "34a9a440-84c2-42cc-808b-38677cb6af8a",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "34a9a440-84c2-42cc-808b-38677cb6af8a",
    "outputId": "e3d3d4b6-ee63-4e28-d794-e8b0bdd931fd"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "blobfile version: 3.0.0\n",
      "huggingface_hub version: 0.24.7\n",
      "tiktoken version: 0.8.0\n",
      "torch version: 2.4.1+cu121\n"
     ]
    }
   ],
   "source": [
    "from importlib.metadata import version\n",
    "\n",
    "pkgs = [\n",
    "    \"blobfile\",         # to download pretrained weights\n",
    "    \"huggingface_hub\",  # to download pretrained weights\n",
    "    \"tiktoken\",         # to implement the tokenizer\n",
    "    \"torch\",            # to implement the model\n",
    "]\n",
    "for p in pkgs:\n",
    "    print(f\"{p} version: {version(p)}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "UJJneXpTEg4W",
   "metadata": {
    "id": "UJJneXpTEg4W"
   },
   "source": [
    "&nbsp;\n",
    "# 1. 逐步转换 LLaMA 模型实现"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "v1zpfX2GHBKa",
   "metadata": {
    "id": "v1zpfX2GHBKa"
   },
   "source": [
    "- 如果您 **刚接触** LLM 架构的实现，建议从 **[第 4 章](../../ch04/01_main-chapter-code/ch04.ipynb)** 开始，该章节 **逐步讲解了原始 GPT 架构的实现**。  \n",
    "- 随后，[《从零开始将 GPT 架构转换为 LLaMA 2》](./converting-gpt-to-llama2.ipynb) 介绍了 **LLaMA 特定组件**，包括：\n",
    "  - **RMSNorm** 层  \n",
    "  - **SiLU** 和 **SwiGLU** 激活函数  \n",
    "  - **RoPE（旋转位置编码）**  \n",
    "  - **SentencePiece 分词器**  \n",
    "- 本笔记本将 **LLaMA 2** 结构转换为 **LLaMA 3** 结构，具体步骤如下：\n",
    "  1. **修改旋转位置编码（RoPE）**\n",
    "  2. **实现分组查询注意力（Grouped-Query Attention, GQA）**\n",
    "  3. **采用定制版的 GPT-4 分词器**  \n",
    "- 最后，我们将在此架构中 **加载 Meta AI 提供的原始 LLaMA 3 预训练权重**。  "
   ]
  },
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   "metadata": {
    "id": "c14b9121-abe1-4a46-99b8-acdef71e5b41"
   },
   "source": [
    "&nbsp;\n",
    "## 1.1 复用 LLaMA 2 组件"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "dgDhJGJ6xR4e",
   "metadata": {
    "id": "dgDhJGJ6xR4e"
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   "source": [
    "- **LLaMA 2** 与 **LLaMA 3** 结构上 **非常相似**，如上所述，并在本笔记本顶部的示意图中进行了说明。  \n",
    "- 这意味着，我们可以通过以下代码，从 [LLaMA 2 笔记本](./converting-gpt-to-llama2.ipynb) 中 **导入多个基础模块**： "
   ]
  },
  {
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   "execution_count": 3,
   "id": "a5bc3948-231b-4f1f-8d41-24ad0b7643d0",
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   "source": [
    "import os\n",
    "import sys\n",
    "import io\n",
    "import nbformat\n",
    "import types\n",
    "\n",
    "def import_from_notebook():\n",
    "    def import_definitions_from_notebook(fullname, names):\n",
    "        current_dir = os.getcwd()\n",
    "        path = os.path.join(current_dir, fullname + \".ipynb\")\n",
    "        path = os.path.normpath(path)\n",
    "\n",
    "        # Load the notebook\n",
    "        if not os.path.exists(path):\n",
    "            raise FileNotFoundError(f\"Notebook file not found at: {path}\")\n",
    "\n",
    "        with io.open(path, \"r\", encoding=\"utf-8\") as f:\n",
    "            nb = nbformat.read(f, as_version=4)\n",
    "\n",
    "        # Create a module to store the imported functions and classes\n",
    "        mod = types.ModuleType(fullname)\n",
    "        sys.modules[fullname] = mod\n",
    "\n",
    "        # Go through the notebook cells and only execute function or class definitions\n",
    "        for cell in nb.cells:\n",
    "            if cell.cell_type == \"code\":\n",
    "                cell_code = cell.source\n",
    "                for name in names:\n",
    "                    # Check for function or class definitions\n",
    "                    if f\"def {name}\" in cell_code or f\"class {name}\" in cell_code:\n",
    "                        exec(cell_code, mod.__dict__)\n",
    "        return mod\n",
    "\n",
    "    fullname = \"converting-gpt-to-llama2\"\n",
    "    names = [\"precompute_rope_params\", \"compute_rope\", \"SiLU\", \"FeedForward\", \"RMSNorm\", \"MultiHeadAttention\"]\n",
    "\n",
    "    return import_definitions_from_notebook(fullname, names)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "d546032d-fce4-47cf-8d0e-682b78b21c61",
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    "id": "d546032d-fce4-47cf-8d0e-682b78b21c61"
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   "outputs": [],
   "source": [
    "imported_module = import_from_notebook()\n",
    "\n",
    "# We need to redefine precompute_rope_params\n",
    "# precompute_rope_params = getattr(imported_module, \"precompute_rope_params\", None)\n",
    "compute_rope = getattr(imported_module, \"compute_rope\", None)\n",
    "SiLU = getattr(imported_module, \"SiLU\", None)\n",
    "FeedForward = getattr(imported_module, \"FeedForward\", None)\n",
    "RMSNorm = getattr(imported_module, \"RMSNorm\", None)\n",
    "\n",
    "# MultiHeadAttention only for comparison purposes\n",
    "MultiHeadAttention = getattr(imported_module, \"MultiHeadAttention\", None)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "979c7b6d-1370-4da1-8bfb-a2b27537bf2f",
   "metadata": {
    "id": "979c7b6d-1370-4da1-8bfb-a2b27537bf2f"
   },
   "source": [
    "&nbsp;\n",
    "## 1.2 优化RoPE"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "m9_oDcHCx8VI",
   "metadata": {
    "id": "m9_oDcHCx8VI"
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   "source": [
    "- **LLaMA 3** 采用与 **LLaMA 2** 类似的 **旋转位置编码（RoPE）**（详细说明请参考 [RoPE 论文](https://arxiv.org/abs/2104.09864)）。  \n",
    "- 但在 RoPE 的具体设置上存在一些 **细微差异**：\n",
    "  - **LLaMA 3** 现在支持 **最多 8,192 个 Token**，是 **LLaMA 2（4,096 个 Token）** 的 **一倍**。  \n",
    "  - **RoPE 的基础值** $\\theta$（见下方公式）从 **10,000（LLaMA 2）** 提高至 **500,000（LLaMA 3）**。  \n",
    "\n",
    "  公式（改编自 [RoPE 论文](https://arxiv.org/abs/2104.09864)）：  \n",
    "  $$\n",
    "  \\Theta = \\left\\{\\theta_i = \\text{base}^{\\frac{-2(i-1)}{d}}, i \\in \\left[1, 2, ..., d/2\\right]\\right\\}\n",
    "  $$\n",
    "\n",
    "- 其中，$\\theta$ 值是一组 **预定义参数**，用于计算 **旋转矩阵** 中的旋转角度，其中 $d$ 为 **嵌入空间维度**。  \n",
    "- **将基础值从 10,000 增加到 500,000** 使得频率（旋转角度）在维度上的衰减 **更缓慢**，意味着高维度的角度比以前更大（本质上是对 **频率的解压缩**）。  \n",
    "- 此外，我们在下面的代码中 **引入 `freq_config` 配置** 以调整频率；但 **LLaMA 3 本身并不需要此调整**（仅适用于 **LLaMA 3.1 和 LLaMA 3.2**）。因此，我们稍后会 **重新讨论 `freq_config`**，目前它默认为 `None` 并被 **忽略**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "6Upl109OOAcu",
   "metadata": {
    "id": "6Upl109OOAcu"
   },
   "outputs": [],
   "source": [
    "import torch\n",
    "\n",
    "def precompute_rope_params(head_dim, theta_base=10_000, context_length=4096, freq_config=None):\n",
    "    assert head_dim % 2 == 0, \"Embedding dimension must be even\"\n",
    "\n",
    "    # Compute the inverse frequencies\n",
    "    inv_freq = 1.0 / (theta_base ** (torch.arange(0, head_dim, 2)[: (head_dim // 2)].float() / head_dim))\n",
    "\n",
    "    ################################ NEW ###############################################\n",
    "    # Frequency adjustments\n",
    "    if freq_config is not None:\n",
    "        low_freq_wavelen = freq_config[\"original_context_length\"] / freq_config[\"low_freq_factor\"]\n",
    "        high_freq_wavelen = freq_config[\"original_context_length\"] / freq_config[\"high_freq_factor\"]\n",
    "\n",
    "        wavelen = 2 * torch.pi / inv_freq\n",
    "\n",
    "        inv_freq_llama = torch.where(\n",
    "            wavelen > low_freq_wavelen, inv_freq / freq_config[\"factor\"], inv_freq\n",
    "        )\n",
    "\n",
    "        smooth_factor = (freq_config[\"original_context_length\"] / wavelen - freq_config[\"low_freq_factor\"]) / (\n",
    "            freq_config[\"high_freq_factor\"] - freq_config[\"low_freq_factor\"]\n",
    "        )\n",
    "\n",
    "        smoothed_inv_freq = (\n",
    "            (1 - smooth_factor) * (inv_freq / freq_config[\"factor\"]) + smooth_factor * inv_freq\n",
    "        )\n",
    "\n",
    "        is_medium_freq = (wavelen <= low_freq_wavelen) & (wavelen >= high_freq_wavelen)\n",
    "        inv_freq_llama = torch.where(is_medium_freq, smoothed_inv_freq, inv_freq_llama)\n",
    "        inv_freq = inv_freq_llama\n",
    "    ####################################################################################\n",
    "\n",
    "\n",
    "    # Generate position indices\n",
    "    positions = torch.arange(context_length)\n",
    "\n",
    "    # Compute the angles\n",
    "    angles = positions[:, None] * inv_freq[None, :]  # Shape: (context_length, head_dim // 2)\n",
    "\n",
    "    # Expand angles to match the head_dim\n",
    "    angles = torch.cat([angles, angles], dim=1)  # Shape: (context_length, head_dim)\n",
    "\n",
    "    # Precompute sine and cosine\n",
    "    cos = torch.cos(angles)\n",
    "    sin = torch.sin(angles)\n",
    "\n",
    "    return cos, sin"
   ]
  },
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   "cell_type": "markdown",
   "id": "jJBvO0YMJBXR",
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   "source": [
    "- 总结一下，**LLaMA 3** 相较于 **LLaMA 2** 的主要变化在于：\n",
    "  - **上下文长度（Context Length）** 增加到 **8,192**（LLaMA 2 为 **4,096**）。  \n",
    "  - **RoPE 的基础值 $\\theta$** 从 **10,000** 提高至 **500,000**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "56c37216-e022-4603-be16-f9d3eaeaf4a1",
   "metadata": {
    "id": "56c37216-e022-4603-be16-f9d3eaeaf4a1"
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   "outputs": [],
   "source": [
    "# Instantiate RoPE parameters\n",
    "\n",
    "llama_2_context_len = 4096\n",
    "llama_3_context_len = 8192\n",
    "\n",
    "llama_2_theta_base = 10_000\n",
    "llama_3_theta_base = 500_000"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "_V8v6i7MJItU",
   "metadata": {
    "id": "_V8v6i7MJItU"
   },
   "source": [
    "- **RoPE 的使用方式仍与 LLaMA 2 相同**："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "dae70c8a-eb18-40f9-a2e5-a6af2a57628b",
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    "id": "dae70c8a-eb18-40f9-a2e5-a6af2a57628b"
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   "outputs": [],
   "source": [
    "# Settings\n",
    "batch_size = 2\n",
    "num_heads = 4\n",
    "head_dim = 16\n",
    "\n",
    "# Instantiate RoPE parameters\n",
    "cos, sin = precompute_rope_params(\n",
    "    head_dim=head_dim,\n",
    "    theta_base=llama_3_theta_base,\n",
    "    context_length=llama_3_context_len\n",
    ")\n",
    "\n",
    "# Dummy query and key tensors\n",
    "torch.manual_seed(123)\n",
    "queries = torch.randn(batch_size, num_heads, llama_3_context_len, head_dim)\n",
    "keys = torch.randn(batch_size, num_heads, llama_3_context_len, head_dim)\n",
    "\n",
    "# Apply rotary position embeddings\n",
    "queries_rot = compute_rope(queries, cos, sin)\n",
    "keys_rot = compute_rope(keys, cos, sin)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "cd19b75c-cf25-47b8-a010-6733fc0e9a8a",
   "metadata": {
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   },
   "source": [
    "&nbsp;\n",
    "## 1.3 分组查询注意力（Grouped-Query Attention, GQA）"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "111c7d3f-fded-49e8-a617-9fe67b81dddc",
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   },
   "source": [
    "- 在本节中，我们用 **分组查询注意力（GQA）** 取代 **多头注意力（MHA）**。  \n",
    "- 简而言之，**GQA** 可以看作是 **计算和参数更加高效** 的 **MHA 替代方案**。  \n",
    "- 在 **GQA** 机制中，我们通过 **共享多个注意力头的键（Key）和值（Value）** 来减少 **Key-Value 投影** 的数量。  \n",
    "- 每个注意力头仍然有 **独立的查询（Query）**，但它们会关注 **相同的 Key-Value 组**。  \n",
    "- 下图展示了 **GQA 机制**，其中 **每组 Key-Value 共享 2 个注意力头（kv-groups = 2）**：\n",
    "\n",
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/grouped-query-attention.webp\" width=\"500px\">"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "perAYa2R_KW2",
   "metadata": {
    "id": "perAYa2R_KW2"
   },
   "source": [
    "- **GQA** 的核心思想是 **减少** 访问 **Key-Value 对** 的 **独立查询组** 数量，从而：\n",
    "  - **减少矩阵乘法的计算量**  \n",
    "  - **降低 MHA（多头注意力）的参数规模**  \n",
    "  - **在不显著影响建模性能的前提下提高计算效率**  \n",
    "- **GQA 代码** 与 **MHA（多头注意力）** 十分相似（代码中的 **\"NEW\"** 部分标注了关键改动）。  \n",
    "- **简而言之，GQA 的主要变化** 是：\n",
    "  - **每个查询组（Query Group）需要重复，以匹配其关联的多头数**（具体实现如下）。  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "842aa71a-4659-424e-8830-392bd6ae86af",
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   "source": [
    "- **此外，我们引入 `SharedBuffers` 类**，用于在 **Transformer 块** 中 **复用 `mask`、`cos` 和 `sin` 张量**，以提高计算效率。  \n",
    "  - 这一优化在 **LLaMA 3.1 和 LLaMA 3.2** 等支持 **多达 131k 输入 Token** 的模型中至关重要。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "9b12e674-ef08-4dd7-8843-615b65b39c91",
   "metadata": {
    "id": "9b12e674-ef08-4dd7-8843-615b65b39c91"
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   "source": [
    "import torch.nn as nn\n",
    "\n",
    "\n",
    "############################# NEW  #############################\n",
    "class SharedBuffers:\n",
    "    _buffers = {}\n",
    "\n",
    "    @staticmethod\n",
    "    def get_buffers(context_length, head_dim, rope_base, freq_config, dtype=torch.float32):\n",
    "        key = (context_length, head_dim, rope_base, tuple(freq_config.values()) if freq_config else freq_config, dtype)\n",
    "\n",
    "        if key not in SharedBuffers._buffers:\n",
    "            # Create or fetch the buffers\n",
    "            mask = torch.triu(torch.ones(context_length, context_length), diagonal=1)\n",
    "            cos, sin = precompute_rope_params(head_dim, rope_base, context_length, freq_config)\n",
    "            if dtype is not None:\n",
    "                cos = cos.to(dtype)\n",
    "                sin = sin.to(dtype)\n",
    "            SharedBuffers._buffers[key] = (mask, cos, sin)\n",
    "\n",
    "        return SharedBuffers._buffers[key]\n",
    "############################# NEW  #############################\n",
    "\n",
    "\n",
    "class GroupedQueryAttention(nn.Module):\n",
    "    def __init__(\n",
    "            self, d_in, d_out, context_length, num_heads,\n",
    "            num_kv_groups,       # NEW\n",
    "            rope_base=10_000,    # NEW\n",
    "            rope_config=None,    # NEW\n",
    "            dtype=None\n",
    "        ):\n",
    "        super().__init__()\n",
    "        assert d_out % num_heads == 0, \"d_out must be divisible by num_heads\"\n",
    "        assert num_heads % num_kv_groups == 0, \"num_heads must be divisible by num_kv_groups\"  # NEW\n",
    "\n",
    "        self.d_out = d_out\n",
    "        self.num_heads = num_heads\n",
    "        self.head_dim = d_out // num_heads\n",
    "\n",
    "        ############################# NEW  #############################\n",
    "        # self.W_key = nn.Linear(d_in, d_out, bias=False, dtype=dtype)\n",
    "        # self.W_value = nn.Linear(d_in, d_out, bias=False, dtype=dtype)\n",
    "        self.W_key = nn.Linear(d_in, num_kv_groups * self.head_dim, bias=False, dtype=dtype)\n",
    "        self.W_value = nn.Linear(d_in, num_kv_groups * self.head_dim, bias=False, dtype=dtype)\n",
    "        self.num_kv_groups = num_kv_groups\n",
    "        self.group_size = num_heads // num_kv_groups\n",
    "        ################################################################\n",
    "\n",
    "        self.W_query = nn.Linear(d_in, d_out, bias=False, dtype=dtype)\n",
    "        self.out_proj = nn.Linear(d_out, d_out, bias=False, dtype=dtype)\n",
    "\n",
    "        ############################# NEW  #############################\n",
    "        # Fetch buffers using SharedBuffers\n",
    "        mask, cos, sin = SharedBuffers.get_buffers(context_length, self.head_dim, rope_base, rope_config, dtype)\n",
    "        ############################# NEW  #############################\n",
    "        \n",
    "        self.register_buffer(\"mask\", mask)\n",
    "        self.register_buffer(\"cos\", cos)\n",
    "        self.register_buffer(\"sin\", sin)\n",
    "\n",
    "    def forward(self, x):\n",
    "        b, num_tokens, d_in = x.shape\n",
    "\n",
    "        queries = self.W_query(x)  # Shape: (b, num_tokens, d_out)\n",
    "        keys = self.W_key(x)  # Shape: (b, num_tokens, num_kv_groups * head_dim)\n",
    "        values = self.W_value(x)  # Shape: (b, num_tokens, num_kv_groups * head_dim)\n",
    "\n",
    "        # Reshape queries, keys, and values\n",
    "        queries = queries.view(b, num_tokens, self.num_heads, self.head_dim)\n",
    "\n",
    "        ##################### NEW  #####################\n",
    "        # keys = keys.view(b, num_tokens, self.num_heads, self.head_dim)\n",
    "        # values = values.view(b, num_tokens, self.num_heads, self.head_dim)\n",
    "        keys = keys.view(b, num_tokens, self.num_kv_groups, self.head_dim)\n",
    "        values = values.view(b, num_tokens, self.num_kv_groups, self.head_dim)\n",
    "        ################################################\n",
    "\n",
    "        # Transpose keys, values, and queries\n",
    "        keys = keys.transpose(1, 2)  # Shape: (b, num_heads, num_tokens, head_dim)\n",
    "        values = values.transpose(1, 2)  # Shape: (b, num_heads, num_tokens, head_dim)\n",
    "        queries = queries.transpose(1, 2)  # Shape: (b, num_query_groups, num_tokens, head_dim)\n",
    "\n",
    "        # Apply RoPE\n",
    "        keys = compute_rope(keys, self.cos, self.sin)\n",
    "        queries = compute_rope(queries, self.cos, self.sin)\n",
    "\n",
    "        ##################### NEW  #####################\n",
    "        # Expand keys and values to match the number of heads\n",
    "        # Shape: (b, num_heads, num_tokens, head_dim)\n",
    "\n",
    "        keys = keys.repeat_interleave(self.group_size, dim=1)  # Shape: (b, num_heads, num_tokens, head_dim)\n",
    "        values = values.repeat_interleave(self.group_size, dim=1)  # Shape: (b, num_heads, num_tokens, head_dim)\n",
    "        # For example, before repeat_interleave along dim=1 (query groups):\n",
    "        #   [K1, K2]\n",
    "        # After repeat_interleave (each query group is repeated group_size times):\n",
    "        #   [K1, K1, K2, K2]\n",
    "        # If we used regular repeat instead of repeat_interleave, we'd get:\n",
    "        #   [K1, K2, K1, K2]\n",
    "        ################################################\n",
    "\n",
    "        # Compute scaled dot-product attention (aka self-attention) with a causal mask\n",
    "        # Shape: (b, num_heads, num_tokens, num_tokens)\n",
    "        attn_scores = queries @ keys.transpose(2, 3)  # Dot product for each head\n",
    "\n",
    "        # Original mask truncated to the number of tokens and converted to boolean\n",
    "        mask_bool = self.mask.bool()[:num_tokens, :num_tokens]\n",
    "\n",
    "        # Use the mask to fill attention scores\n",
    "        attn_scores.masked_fill_(mask_bool, -torch.inf)\n",
    "\n",
    "        attn_weights = torch.softmax(attn_scores / keys.shape[-1]**0.5, dim=-1)\n",
    "        assert keys.shape[-1] == self.head_dim\n",
    "\n",
    "        # Shape: (b, num_tokens, num_heads, head_dim)\n",
    "        context_vec = (attn_weights @ values).transpose(1, 2)\n",
    "\n",
    "        # Combine heads, where self.d_out = self.num_heads * self.head_dim\n",
    "        context_vec = context_vec.reshape(b, num_tokens, self.d_out)\n",
    "        context_vec = self.out_proj(context_vec)  # optional projection\n",
    "\n",
    "        return context_vec"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "roAXSwJs9hR8",
   "metadata": {
    "id": "roAXSwJs9hR8"
   },
   "source": [
    "- 为了直观展示 **参数节省** 的效果，下面以 **GPT** 和 **LLaMA 2** 代码中的 **多头注意力（MHA）** 作为示例：\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "b4b8f085-349e-4674-a3f0-78fde0664fac",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "b4b8f085-349e-4674-a3f0-78fde0664fac",
    "outputId": "9da09d72-43b1-45af-d46f-6928ea4af33a"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "W_key: torch.Size([4096, 4096])\n",
      "W_value: torch.Size([4096, 4096])\n",
      "W_query: torch.Size([4096, 4096])\n"
     ]
    }
   ],
   "source": [
    "# Settings\n",
    "batch_size = 1\n",
    "context_len = 3000\n",
    "max_context_len = 8192\n",
    "embed_dim = 4096\n",
    "num_heads = 32\n",
    "\n",
    "\n",
    "example_batch = torch.randn((batch_size, context_len, embed_dim))\n",
    "\n",
    "mha = MultiHeadAttention(\n",
    "    d_in=embed_dim,\n",
    "    d_out=embed_dim,\n",
    "    context_length=max_context_len,\n",
    "    num_heads=num_heads\n",
    ")\n",
    "\n",
    "mha(example_batch)\n",
    "\n",
    "print(\"W_key:\", mha.W_key.weight.shape)\n",
    "print(\"W_value:\", mha.W_value.weight.shape)\n",
    "print(\"W_query:\", mha.W_query.weight.shape)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "IMQtFkcQ9sXC",
   "metadata": {
    "id": "IMQtFkcQ9sXC"
   },
   "source": [
    "- 现在，如果我们改用 **分组查询注意力（GQA）**，并设置 **8 个 Key-Value 组（kv-groups）**（这是 **LLaMA 3 8B** 使用的设置），我们可以观察到：\n",
    "  - **Key 和 Value 矩阵的行数减少了 4 倍**，  \n",
    "  - 因为 **32 个注意力头 ÷ 8 个 kv-groups = 4**。  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "15e65d3c-7b42-4ed3-bfee-bb09578657bb",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "15e65d3c-7b42-4ed3-bfee-bb09578657bb",
    "outputId": "69709a78-2aaa-4597-8142-2f44eb59753f"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "W_key: torch.Size([1024, 4096])\n",
      "W_value: torch.Size([1024, 4096])\n",
      "W_query: torch.Size([4096, 4096])\n"
     ]
    }
   ],
   "source": [
    "gqa = GroupedQueryAttention(\n",
    "    d_in=embed_dim,\n",
    "    d_out=embed_dim,\n",
    "    context_length=max_context_len,\n",
    "    num_heads=num_heads,\n",
    "    num_kv_groups=8,\n",
    "    rope_base=llama_3_theta_base\n",
    ")\n",
    "\n",
    "gqa(example_batch)\n",
    "\n",
    "print(\"W_key:\", gqa.W_key.weight.shape)\n",
    "print(\"W_value:\", gqa.W_value.weight.shape)\n",
    "print(\"W_query:\", gqa.W_query.weight.shape)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1a5d4c88-c66a-483b-b4e2-419ff9fd60d5",
   "metadata": {
    "id": "1a5d4c88-c66a-483b-b4e2-419ff9fd60d5"
   },
   "source": [
    "- **补充说明**：如果希望 **分组查询注意力（GQA）** 等效于 **标准多头注意力（MHA）**，可以将 **查询组数（`num_kv_groups`）** 设为 **注意力头数（`num_heads`）**。  \n",
    "- 最后，我们来对比 **参数数量**：  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "58f713aa-ac00-4e2f-8247-94609aa01350",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "58f713aa-ac00-4e2f-8247-94609aa01350",
    "outputId": "486dfd9c-9f3a-4b9e-f9a2-35fb43b9a5fb"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Total number of parameters:\n",
      "MHA: 67,108,864\n",
      "GQA: 41,943,040\n"
     ]
    }
   ],
   "source": [
    "print(\"Total number of parameters:\")\n",
    "\n",
    "mha_total_params = sum(p.numel() for p in mha.parameters())\n",
    "print(f\"MHA: {mha_total_params:,}\")\n",
    "\n",
    "gqa_total_params = sum(p.numel() for p in gqa.parameters())\n",
    "print(f\"GQA: {gqa_total_params:,}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "78b60dfd-6c0f-41f7-8f0c-8e57116f07f5",
   "metadata": {
    "id": "78b60dfd-6c0f-41f7-8f0c-8e57116f07f5"
   },
   "outputs": [],
   "source": [
    "# Free up memory:\n",
    "del mha\n",
    "del gqa"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8fcd8802-2859-45a2-905a-f4fe96629dd9",
   "metadata": {
    "id": "8fcd8802-2859-45a2-905a-f4fe96629dd9"
   },
   "source": [
    "&nbsp;\n",
    "## 1.4 更新 `TransformerBlock` 模块"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "KABNccft_YnR",
   "metadata": {
    "id": "KABNccft_YnR"
   },
   "source": [
    "- 接下来，我们更新 **`TransformerBlock`**。  \n",
    "- 主要修改如下：\n",
    "  - **将 `MultiHeadAttention` 替换为 `GroupedQueryAttention`**  \n",
    "  - **添加新的 RoPE 设置**  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "f9fa8eb4-7196-4dee-aec6-0dcbc70921c4",
   "metadata": {
    "id": "f9fa8eb4-7196-4dee-aec6-0dcbc70921c4"
   },
   "outputs": [],
   "source": [
    "class TransformerBlock(nn.Module):\n",
    "    def __init__(self, cfg):\n",
    "        super().__init__()\n",
    "        self.att =  GroupedQueryAttention(  # MultiHeadAttention(\n",
    "            d_in=cfg[\"emb_dim\"],\n",
    "            d_out=cfg[\"emb_dim\"],\n",
    "            context_length=cfg[\"context_length\"],\n",
    "            num_heads=cfg[\"n_heads\"],\n",
    "            num_kv_groups=cfg[\"n_kv_groups\"],  # NEW\n",
    "            rope_base=cfg[\"rope_base\"],        # NEW\n",
    "            rope_config=cfg[\"rope_freq\"],      # NEW\n",
    "            dtype=cfg[\"dtype\"]\n",
    "        )\n",
    "        self.ff = FeedForward(cfg)\n",
    "        self.norm1 = RMSNorm(cfg[\"emb_dim\"], eps=1e-5)\n",
    "        self.norm2 = RMSNorm(cfg[\"emb_dim\"], eps=1e-5)\n",
    "\n",
    "    def forward(self, x):\n",
    "        # Shortcut connection for attention block\n",
    "        shortcut = x\n",
    "        x = self.norm1(x)\n",
    "        x = self.att(x.to(torch.bfloat16))   # Shape [batch_size, num_tokens, emb_size]\n",
    "        x = x + shortcut  # Add the original input back\n",
    "\n",
    "        # Shortcut connection for feed-forward block\n",
    "        shortcut = x\n",
    "        x = self.norm2(x)\n",
    "        x = self.ff(x.to(torch.bfloat16))\n",
    "        x = x + shortcut  # Add the original input back\n",
    "\n",
    "        return x"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fd921ab5-c48c-4c52-bf41-b847b3b822b9",
   "metadata": {
    "id": "fd921ab5-c48c-4c52-bf41-b847b3b822b9"
   },
   "source": [
    "&nbsp;\n",
    "## 1.5 定义model class"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "M_tLAq_r_llN",
   "metadata": {
    "id": "M_tLAq_r_llN"
   },
   "source": [
    "- 在 **设置模型类** 时，我们几乎 **无需修改** 其他内容；只需将模型名称更新为 **`Llama3Model`**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "475755d6-01f7-4e6e-ad9a-cec6f031ebf6",
   "metadata": {
    "id": "475755d6-01f7-4e6e-ad9a-cec6f031ebf6"
   },
   "outputs": [],
   "source": [
    "# class Llama2Model(nn.Module):\n",
    "class Llama3Model(nn.Module):\n",
    "    def __init__(self, cfg):\n",
    "        super().__init__()\n",
    "        self.tok_emb = nn.Embedding(cfg[\"vocab_size\"], cfg[\"emb_dim\"], dtype=cfg[\"dtype\"])\n",
    "\n",
    "        self.trf_blocks = nn.Sequential(\n",
    "            *[TransformerBlock(cfg) for _ in range(cfg[\"n_layers\"])])\n",
    "\n",
    "        self.final_norm = RMSNorm(cfg[\"emb_dim\"], eps=1e-5)\n",
    "        self.out_head = nn.Linear(cfg[\"emb_dim\"], cfg[\"vocab_size\"], bias=False, dtype=cfg[\"dtype\"])\n",
    "\n",
    "    def forward(self, in_idx):\n",
    "        tok_embeds = self.tok_emb(in_idx)\n",
    "        x = tok_embeds\n",
    "        x = self.trf_blocks(x)\n",
    "        x = self.final_norm(x)\n",
    "        logits = self.out_head(x.to(torch.bfloat16))\n",
    "        return logits"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4bc94940-aaeb-45b9-9399-3a69b8043e60",
   "metadata": {
    "id": "4bc94940-aaeb-45b9-9399-3a69b8043e60"
   },
   "source": [
    "&nbsp;\n",
    "## 2. 初始化模型"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "HoGGRAGykQTE",
   "metadata": {
    "id": "HoGGRAGykQTE"
   },
   "source": [
    "- 现在，我们可以 **定义 LLaMA 3 配置文件**（同时提供 **LLaMA 2 配置文件** 作为对比）。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "e0564727-2d35-4f0c-b0fc-cde1e9134a18",
   "metadata": {
    "id": "e0564727-2d35-4f0c-b0fc-cde1e9134a18"
   },
   "outputs": [],
   "source": [
    "LLAMA2_CONFIG_7B = {\n",
    "    \"vocab_size\": 32_000,    # Vocabulary size\n",
    "    \"context_length\": 4096,  # Context length\n",
    "    \"emb_dim\": 4096,         # Embedding dimension\n",
    "    \"n_heads\": 32,           # Number of attention heads\n",
    "    \"n_layers\": 32,          # Number of layers\n",
    "    \"hidden_dim\": 11_008,    # Size of the intermediate dimension in FeedForward\n",
    "    \"dtype\": torch.bfloat16  # Lower-precision dtype to reduce memory usage\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "2ad90f82-15c7-4806-b509-e45b56f57db5",
   "metadata": {
    "id": "2ad90f82-15c7-4806-b509-e45b56f57db5"
   },
   "outputs": [],
   "source": [
    "LLAMA3_CONFIG_8B = {\n",
    "    \"vocab_size\": 128_256,   # NEW: Larger vocabulary size\n",
    "    \"context_length\": 8192,  # NEW: Larger context length\n",
    "    \"emb_dim\": 4096,         # Embedding dimension\n",
    "    \"n_heads\": 32,           # Number of attention heads\n",
    "    \"n_layers\": 32,          # Number of layers\n",
    "    \"hidden_dim\": 14_336,    # NEW: Larger size of the intermediate dimension in FeedForward\n",
    "    \"n_kv_groups\": 8,        # NEW: Key-Value groups for grouped-query attention\n",
    "    \"rope_base\": 500_000.0,  # NEW: The base in RoPE's \"theta\" was increased to 500_000\n",
    "    \"rope_freq\": None,       # NEW: Additional configuration for adjusting the RoPE frequencies\n",
    "    \"dtype\": torch.bfloat16  # Lower-precision dtype to reduce memory usage\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "FAP7fiBzkaBz",
   "metadata": {
    "id": "FAP7fiBzkaBz"
   },
   "source": [
    "- 使用这些设置，我们现在可以 **初始化 LLaMA 3 8B 模型**。  \n",
    "- **注意**：该模型 **需要约 34GB 内存**（作为对比，**LLaMA 2 7B 需要约 26GB 内存**）。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "7004d785-ac9a-4df5-8760-6807fc604686",
   "metadata": {
    "id": "7004d785-ac9a-4df5-8760-6807fc604686"
   },
   "outputs": [],
   "source": [
    "model = Llama3Model(LLAMA3_CONFIG_8B)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "edea6334-d1fc-427d-9cf2-4af963ff4bfc",
   "metadata": {},
   "source": [
    "- 下面的代码应输出 **`True`**，以确认 **缓冲区被复用** 而不是 **被不必要地重新创建**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ee9625cc-9afa-4b11-8aab-d536fd170761",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Check buffers\n",
    "print(model.trf_blocks[0].att.mask is model.trf_blocks[-1].att.mask)\n",
    "print(model.trf_blocks[0].att.cos is model.trf_blocks[-1].att.cos)\n",
    "print(model.trf_blocks[0].att.sin is model.trf_blocks[-1].att.sin) "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8056a521-91a6-440f-8473-591409c3177b",
   "metadata": {},
   "source": [
    "- 现在，我们还将 **计算可训练参数的总数**： "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "6079f747-8f20-4c6b-8d38-7156f1101729",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "6079f747-8f20-4c6b-8d38-7156f1101729",
    "outputId": "0a8cd23b-d9fa-4c2d-ca63-3fc79bc4de0d"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Total number of parameters: 8,030,261,248\n"
     ]
    }
   ],
   "source": [
    "total_params = sum(p.numel() for p in model.parameters())\n",
    "print(f\"Total number of parameters: {total_params:,}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "Bx14NtzWk2wj",
   "metadata": {
    "id": "Bx14NtzWk2wj"
   },
   "source": [
    "- 如上所示，该模型包含 **80 亿（8B）参数**。  \n",
    "- 此外，我们可以使用以下代码 **计算该模型的内存需求**：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "0df1c79e-27a7-4b0f-ba4e-167fe107125a",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "0df1c79e-27a7-4b0f-ba4e-167fe107125a",
    "outputId": "3425e9ce-d8c0-4b37-bded-a2c60b66a41a"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "float32 (PyTorch default): 68.08 GB\n",
      "bfloat16: 34.04 GB\n"
     ]
    }
   ],
   "source": [
    "def model_memory_size(model, input_dtype=torch.float32):\n",
    "    total_params = 0\n",
    "    total_grads = 0\n",
    "    for param in model.parameters():\n",
    "        # Calculate total number of elements per parameter\n",
    "        param_size = param.numel()\n",
    "        total_params += param_size\n",
    "        # Check if gradients are stored for this parameter\n",
    "        if param.requires_grad:\n",
    "            total_grads += param_size\n",
    "\n",
    "    # Calculate buffer size (non-parameters that require memory)\n",
    "    total_buffers = sum(buf.numel() for buf in model.buffers())\n",
    "\n",
    "    # Size in bytes = (Number of elements) * (Size of each element in bytes)\n",
    "    # We assume parameters and gradients are stored in the same type as input dtype\n",
    "    element_size = torch.tensor(0, dtype=input_dtype).element_size()\n",
    "    total_memory_bytes = (total_params + total_grads + total_buffers) * element_size\n",
    "\n",
    "    # Convert bytes to gigabytes\n",
    "    total_memory_gb = total_memory_bytes / (1024**3)\n",
    "\n",
    "    return total_memory_gb\n",
    "\n",
    "print(f\"float32 (PyTorch default): {model_memory_size(model, input_dtype=torch.float32):.2f} GB\")\n",
    "print(f\"bfloat16: {model_memory_size(model, input_dtype=torch.bfloat16):.2f} GB\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "zudd-5PulKFL",
   "metadata": {
    "id": "zudd-5PulKFL"
   },
   "source": [
    "- 最后，如果适用，我们还可以将模型部署到 **NVIDIA GPU** 或 **Apple Silicon GPU**：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "a4c50e19-1402-45b6-8ccd-9077b2ba836d",
   "metadata": {
    "id": "a4c50e19-1402-45b6-8ccd-9077b2ba836d"
   },
   "outputs": [],
   "source": [
    "if torch.cuda.is_available():\n",
    "    device = torch.device(\"cuda\")\n",
    "elif torch.backends.mps.is_available():\n",
    "    device = torch.device(\"mps\")\n",
    "else:\n",
    "    device = torch.device(\"cpu\")\n",
    "\n",
    "model.to(device);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5dc64a06-27dc-46ec-9e6d-1700a8227d34",
   "metadata": {
    "id": "5dc64a06-27dc-46ec-9e6d-1700a8227d34"
   },
   "source": [
    "&nbsp;\n",
    "## 3. 加载tokenizer"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0eb30f0c-6144-4bed-87d9-6b2bac377005",
   "metadata": {
    "id": "0eb30f0c-6144-4bed-87d9-6b2bac377005"
   },
   "source": [
    "- 在本节中，我们将 **加载模型的分词器（Tokenizer）**。  \n",
    "- **LLaMA 2** 使用的是 **Google 的 [SentencePiece](https://github.com/google/sentencepiece) 分词器**，而 **不是** 基于 [Tiktoken](https://github.com/openai/tiktoken) 库的 **OpenAI BPE 分词器**。  \n",
    "- **LLaMA 3** 重新 **回归** 了 **Tiktoken 的 BPE 分词器**，并且 **使用了 GPT-4 分词器**，其 **词汇表** 进行了扩展。  \n",
    "- Meta AI 提供了 **LLaMA 3 适配 Tiktoken 的代码**，可在其官方 **[LLaMA 3 仓库](https://github.com/meta-llama/llama3/blob/main/llama/tokenizer.py)** 中找到。  \n",
    "- 下面的代码是对 **LLaMA 3 分词器** 的 **简化版实现**，旨在提升可读性，同时保持相同的行为。  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "5f390cbf-8f92-46dc-afe3-d90b5affae10",
   "metadata": {
    "id": "5f390cbf-8f92-46dc-afe3-d90b5affae10"
   },
   "outputs": [],
   "source": [
    "import os\n",
    "from pathlib import Path\n",
    "\n",
    "import tiktoken\n",
    "from tiktoken.load import load_tiktoken_bpe\n",
    "\n",
    "\n",
    "class Tokenizer:\n",
    "    def __init__(self, model_path):\n",
    "        assert os.path.isfile(model_path), f\"Model file {model_path} not found\"\n",
    "        mergeable_ranks = load_tiktoken_bpe(model_path)\n",
    "\n",
    "        self.special_tokens = {\n",
    "            \"<|begin_of_text|>\": 128000,\n",
    "            \"<|end_of_text|>\": 128001,\n",
    "            \"<|start_header_id|>\": 128006,\n",
    "            \"<|end_header_id|>\": 128007,\n",
    "            \"<|eot_id|>\": 128009,\n",
    "        }\n",
    "        self.special_tokens.update({\n",
    "            f\"<|reserved_{i}|>\": 128002 + i for i in range(256) if (128002 + i) not in self.special_tokens.values()\n",
    "        })\n",
    "\n",
    "        self.model = tiktoken.Encoding(\n",
    "            name=Path(model_path).name,\n",
    "            pat_str=r\"(?i:'s|'t|'re|'ve|'m|'ll|'d)|[^\\r\\n\\p{L}\\p{N}]?\\p{L}+|\\p{N}{1,3}| ?[^\\s\\p{L}\\p{N}]+[\\r\\n]*|\\s*[\\r\\n]+|\\s+(?!\\S)|\\s+\",\n",
    "            mergeable_ranks=mergeable_ranks,\n",
    "            special_tokens=self.special_tokens\n",
    "        )\n",
    "\n",
    "\n",
    "    def encode(self, text, bos=False, eos=False, allowed_special=set(), disallowed_special=()):\n",
    "        if bos:\n",
    "            tokens = [self.special_tokens[\"<|begin_of_text|>\"]]\n",
    "        else:\n",
    "            tokens = []\n",
    "\n",
    "        tokens += self.model.encode(text, allowed_special=allowed_special, disallowed_special=disallowed_special)\n",
    "\n",
    "        if eos:\n",
    "            tokens.append(self.special_tokens[\"<|end_of_text|>\"])\n",
    "        return tokens\n",
    "\n",
    "    def decode(self, tokens):\n",
    "        return self.model.decode(tokens)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0a1509f8-8778-4fec-ba32-14d95c646167",
   "metadata": {
    "id": "0a1509f8-8778-4fec-ba32-14d95c646167"
   },
   "source": [
    "- **Meta AI** 在 **Hugging Face Hub** 上分享了 **LLaMA 3 原始模型权重**及 **分词器词汇表**。  \n",
    "- 我们将首先从 **Hub** 下载 **分词器词汇表**，然后将其加载到上述代码中。  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "KbnlzsbYmJU6",
   "metadata": {
    "id": "KbnlzsbYmJU6"
   },
   "source": [
    "- 请注意，**Meta AI** 要求您在下载文件之前 **接受 LLaMA 3 许可协议**。  \n",
    "  - 为此，您需要创建 **Hugging Face Hub 账号**，然后访问 [meta-llama/Meta-Llama-3-8B](https://huggingface.co/meta-llama/Meta-Llama-3-8B) 仓库并 **接受许可条款**。  \n",
    "- 接下来，您需要创建一个 **访问令牌（Access Token）**。  \n",
    "  - 要生成 **具有 READ 权限的访问令牌**，请点击 **右上角的个人头像**，然后选择 **\"Settings\"（设置）**。  \n",
    "\n",
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/settings.webp?1\" width=\"300px\">\n",
    "\n",
    "- 然后，创建并复制 **访问令牌**，以便在接下来的代码单元中使用。  \n",
    "\n",
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/access-token.webp?1\" width=\"600px\">\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "3357a230-b678-4691-a238-257ee4e80185",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "3357a230-b678-4691-a238-257ee4e80185",
    "outputId": "a3652def-ea7f-46fb-f293-2a59affb71a0"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "The token has not been saved to the git credentials helper. Pass `add_to_git_credential=True` in this function directly or `--add-to-git-credential` if using via `huggingface-cli` if you want to set the git credential as well.\n",
      "Token is valid (permission: read).\n",
      "Your token has been saved to /root/.cache/huggingface/token\n",
      "Login successful\n"
     ]
    }
   ],
   "source": [
    "from huggingface_hub import login\n",
    "import json\n",
    "\n",
    "with open(\"config.json\", \"r\") as config_file:\n",
    "    config = json.load(config_file)\n",
    "    access_token = config[\"HF_ACCESS_TOKEN\"]\n",
    "\n",
    "login(token=access_token)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "IxGh6ZYQo0VN",
   "metadata": {
    "id": "IxGh6ZYQo0VN"
   },
   "source": [
    "- **使用访问token（Access Token）登录** 后，系统将验证我们已接受 **LLaMA 3 许可协议**，然后即可 **下载分词器词汇表**：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "69714ea8-b9b8-4687-8392-f3abb8f93a32",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "69714ea8-b9b8-4687-8392-f3abb8f93a32",
    "outputId": "c9836ba8-5176-4dd5-b618-6cc36fdbe1f0"
   },
   "outputs": [],
   "source": [
    "from huggingface_hub import hf_hub_download\n",
    "\n",
    "tokenizer_file_path = hf_hub_download(\n",
    "    repo_id=\"meta-llama/Meta-Llama-3-8B\",\n",
    "    filename=\"original/tokenizer.model\",\n",
    "    local_dir=\"Llama-3-8B\"\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "F8BH1Nk0AYCS",
   "metadata": {
    "id": "F8BH1Nk0AYCS"
   },
   "source": [
    "- 请注意，在使用 **LLaMA 3** 相关文件时，我们可能需要 **`blobfile`** 库。  \n",
    "- 该库用于处理存储在 **云存储**（如 **Google Cloud Storage (GCS)**、**Azure Blob Storage** 或 **Amazon S3**）中的 **数据集或模型文件**。  \n",
    "- 您可以通过 **取消注释并运行** 下面的 **`pip` 命令** 来安装此依赖项。  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "5dm6Oz7uAytV",
   "metadata": {
    "id": "5dm6Oz7uAytV"
   },
   "outputs": [],
   "source": [
    "# pip install blobfile"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "8b8c0ce6-a6fb-4b8a-8de2-ee7bb7646fd0",
   "metadata": {
    "id": "8b8c0ce6-a6fb-4b8a-8de2-ee7bb7646fd0"
   },
   "outputs": [],
   "source": [
    "tokenizer = Tokenizer(tokenizer_file_path)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "NVhmFeX3pT_M",
   "metadata": {
    "id": "NVhmFeX3pT_M"
   },
   "source": [
    "- 现在，我们可以使用 **`generate` 函数** 让 **LLaMA 3** 模型 **生成新文本**：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "e0a2b5cd-6cba-4d72-b8ff-04d8315d483e",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "e0a2b5cd-6cba-4d72-b8ff-04d8315d483e",
    "outputId": "990d7b74-cb35-476b-d8bd-d544006e00f4"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Output text:\n",
      " Every effort_dead aeros Ingredients başında.extensionégor clangmissions güc như submodule.and report官方%，.Reader(\",\");\n",
      "ामल ندار Parliamentary !!! HigginsDynamicZhgmt writeln Globalsletion 사진------\n"
     ]
    }
   ],
   "source": [
    "from previous_chapters import generate, text_to_token_ids, token_ids_to_text\n",
    "\n",
    "\n",
    "torch.manual_seed(123)\n",
    "\n",
    "token_ids = generate(\n",
    "    model=model,\n",
    "    idx=text_to_token_ids(\"Every effort\", tokenizer).to(device),\n",
    "    max_new_tokens=30,\n",
    "    context_size=LLAMA3_CONFIG_8B[\"context_length\"],\n",
    "    top_k=1,\n",
    "    temperature=0.\n",
    ")\n",
    "\n",
    "print(\"Output text:\\n\", token_ids_to_text(token_ids, tokenizer))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "93WTtAA5paYV",
   "metadata": {
    "id": "93WTtAA5paYV"
   },
   "source": [
    "- 当然，如上所示，当前生成的文本**并无实际意义**，因为我们尚未对 **LLaMA 3** 模型进行训练。  \n",
    "- 在下一节，我们不会自行训练模型（这将花费 **数万到数十万美元**），而是直接 **加载 Meta AI 提供的预训练权重**。  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f63cc248-1d27-4eb6-aa50-173b436652f8",
   "metadata": {
    "id": "f63cc248-1d27-4eb6-aa50-173b436652f8"
   },
   "source": [
    "&nbsp;\n",
    "## 4. 加载预训练的参数"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "aKeN7rUfqZMI",
   "metadata": {
    "id": "aKeN7rUfqZMI"
   },
   "source": [
    "- 下面，我们加载 **[\"meta-llama/Meta-Llama-3-8B\"](https://huggingface.co/meta-llama/Meta-Llama-3-8B)** 预训练基础模型，该模型在微调之前 **仅用于文本补全**。  \n",
    "- 或者，您可以通过 **修改下一代码单元中的字符串**，加载 **指令微调并对齐的 [\"meta-llama/Meta-Llama-3-8B-Instruct\"](https://huggingface.co/meta-llama/Meta-Llama-3-8B-Instruct) 模型**。  \n",
    "- 这些 **权重文件的总大小约为 16GB**。  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "5fa9c06c-7a53-4b4d-9ce4-acc027322ee4",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/",
     "height": 145,
     "referenced_widgets": [
      "f3788acce34f4956b0727b58d0cf38c6",
      "6022a9426683420690d9b41a0ca4f870",
      "e9aba3d53b4d45c485a7aad649c7b465",
      "f1a12d7929db4309b9881853135359fc",
      "58c9dec75a3346b1b787f88dd510d254",
      "9492edc02dee456f840325d913fa4e4f",
      "66dc94b23556499f985f8accbb1f89cb",
      "7c6658cfff1a4d27af3de148184f77d9",
      "7266a729edfb4a44b5b1c67dc79be146",
      "76dbab4873f342019c5d7624ae2c9775",
      "3cea4b431147441a8d9bd872811d5974",
      "8ae98969541849efa356cf912ac39b1e",
      "f9373112649945e3b446c3e1ec274dc1",
      "d49791082a304ade95c185c79fae1f41",
      "616e383bb3d442bcb6edb2721a8180b6",
      "87f474861e54432e9d533e0a89bb77da",
      "e805bb6dfee34dab8870f4618d8bffdb",
      "be3e9bf271f04eb0b119659e1af3a0ea",
      "00148825ce0248b7a23eb28e3eca6749",
      "f1a9b0c2431640298a6c1b258298b12d",
      "8ba9f009e92a46fcbcbb401dc444f12e",
      "d74186bb74d142dfb683fa347b6990f7",
      "9bb60a5a3710463ebe3a17f8d2a446be",
      "0a08fb81165748748ccb080e6df0600f",
      "603690f543114a7fb6aebd433c80bdc3",
      "773b802daed942f5a11f3eab3b83be08",
      "7989003a613e45f780d3f800e121543a",
      "9d49589118f5432cac49650251046429",
      "f114549fe8ce49638a791ca2fecb2d89",
      "0aa155b794a8426aa265f4a7670f43ad",
      "a06fbde549cc47fdaddfbdb82d35d823",
      "172c0c6955e1428b999dcb2d133704cd",
      "1bf7108774c34016a2193e2cd7639b7d",
      "ed28e180d94a4b7aa548581612e31232",
      "ff4338faded5494da1ccb660e1c441ed",
      "b46a08cf4929422eb0f76d8d9af11249",
      "f049eb4a50f54c34912ca959d2eaf353",
      "80dfd3e80ceb444a83ec1fd65f9af80e",
      "519147a10b984befbd0f255f78c1f66a",
      "562e82438dbe41b793ff488b8447c5bf",
      "1da83719e47c4196b06f3aa32056b560",
      "c4a2c88326d14fbca87cfde073755a2e",
      "f0ab5a46cbb0444c88ed137d8a95002b",
      "f8f28ac0e149428f9fef42373c6a87d0"
     ]
    },
    "id": "5fa9c06c-7a53-4b4d-9ce4-acc027322ee4",
    "outputId": "c05118ce-9f81-41c8-a1f2-72caa932ae86"
   },
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "245443330e4d40c887a5649cc1663e98",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00001-of-00004.safetensors:   0%|          | 0.00/4.98G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "from safetensors.torch import load_file\n",
    "\n",
    "combined_weights = {}\n",
    "\n",
    "for i in range(1, 5):\n",
    "    weights_file = hf_hub_download(\n",
    "        repo_id=\"meta-llama/Meta-Llama-3-8B\",\n",
    "        filename=f\"model-0000{i}-of-00004.safetensors\",\n",
    "        local_dir=\"Llama-3-8B\"\n",
    "    )\n",
    "    current_weights = load_file(weights_file)\n",
    "    combined_weights.update(current_weights)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "-15SJ7btq2zE",
   "metadata": {
    "id": "-15SJ7btq2zE"
   },
   "source": [
    "- **`weights`** 变量包含以下 **张量**（为简洁起见，仅展示 **前 15 个**）：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "ee26bd0b-fea9-4924-97f7-409c14f28e49",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "ee26bd0b-fea9-4924-97f7-409c14f28e49",
    "outputId": "2fbc2786-677f-4fea-9472-5fb8542ff14b"
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['model.embed_tokens.weight',\n",
       " 'model.layers.0.input_layernorm.weight',\n",
       " 'model.layers.0.mlp.down_proj.weight',\n",
       " 'model.layers.0.mlp.gate_proj.weight',\n",
       " 'model.layers.0.mlp.up_proj.weight',\n",
       " 'model.layers.0.post_attention_layernorm.weight',\n",
       " 'model.layers.0.self_attn.k_proj.weight',\n",
       " 'model.layers.0.self_attn.o_proj.weight',\n",
       " 'model.layers.0.self_attn.q_proj.weight',\n",
       " 'model.layers.0.self_attn.v_proj.weight',\n",
       " 'model.layers.1.input_layernorm.weight',\n",
       " 'model.layers.1.mlp.down_proj.weight',\n",
       " 'model.layers.1.mlp.gate_proj.weight',\n",
       " 'model.layers.1.mlp.up_proj.weight',\n",
       " 'model.layers.1.post_attention_layernorm.weight']"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "list(combined_weights.keys())[:15]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "UeeSpnunrDFB",
   "metadata": {
    "id": "UeeSpnunrDFB"
   },
   "source": [
    "- The following function, modeled after the `load_weights_into_gpt` function in [chapter 5](../01_main-chapter-code/ch05.ipynb), loads the pretrained weights into our Llama 3 model:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "3820e2a7-4f26-41bc-953b-f3879b0aff65",
   "metadata": {
    "id": "3820e2a7-4f26-41bc-953b-f3879b0aff65"
   },
   "outputs": [],
   "source": [
    "def assign(left, right, tensor_name=\"unknown\"):\n",
    "    if left.shape != right.shape:\n",
    "        raise ValueError(f\"Shape mismatch in tensor '{tensor_name}'. Left: {left.shape}, Right: {right.shape}\")\n",
    "\n",
    "    if isinstance(right, torch.Tensor):\n",
    "        return torch.nn.Parameter(right.clone().detach())\n",
    "    else:\n",
    "        return torch.nn.Parameter(torch.tensor(right))\n",
    "\n",
    "\n",
    "def load_weights_into_llama(model, param_config, params):\n",
    "    model.tok_emb.weight = assign(model.tok_emb.weight, params[\"model.embed_tokens.weight\"], \"model.embed_tokens.weight\")\n",
    "\n",
    "    for l in range(param_config[\"n_layers\"]):\n",
    "\n",
    "        # Load attention weights\n",
    "        model.trf_blocks[l].att.W_query.weight = assign(\n",
    "            model.trf_blocks[l].att.W_query.weight,\n",
    "            params[f\"model.layers.{l}.self_attn.q_proj.weight\"],\n",
    "            f\"model.layers.{l}.self_attn.q_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].att.W_key.weight = assign(\n",
    "            model.trf_blocks[l].att.W_key.weight,\n",
    "            params[f\"model.layers.{l}.self_attn.k_proj.weight\"],\n",
    "            f\"model.layers.{l}.self_attn.k_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].att.W_value.weight = assign(\n",
    "            model.trf_blocks[l].att.W_value.weight,\n",
    "            params[f\"model.layers.{l}.self_attn.v_proj.weight\"],\n",
    "            f\"model.layers.{l}.self_attn.v_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].att.out_proj.weight = assign(\n",
    "            model.trf_blocks[l].att.out_proj.weight,\n",
    "            params[f\"model.layers.{l}.self_attn.o_proj.weight\"],\n",
    "            f\"model.layers.{l}.self_attn.o_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].norm1.weight = assign(\n",
    "            model.trf_blocks[l].norm1.weight,\n",
    "            params[f\"model.layers.{l}.input_layernorm.weight\"],\n",
    "            f\"model.layers.{l}.input_layernorm.weight\"\n",
    "        )\n",
    "\n",
    "        # Load FeedForward weights\n",
    "        model.trf_blocks[l].ff.fc1.weight = assign(\n",
    "            model.trf_blocks[l].ff.fc1.weight,\n",
    "            params[f\"model.layers.{l}.mlp.gate_proj.weight\"],\n",
    "            f\"model.layers.{l}.mlp.gate_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].ff.fc2.weight = assign(\n",
    "            model.trf_blocks[l].ff.fc2.weight,\n",
    "            params[f\"model.layers.{l}.mlp.up_proj.weight\"],\n",
    "            f\"model.layers.{l}.mlp.up_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].ff.fc3.weight = assign(\n",
    "            model.trf_blocks[l].ff.fc3.weight,\n",
    "            params[f\"model.layers.{l}.mlp.down_proj.weight\"],\n",
    "            f\"model.layers.{l}.mlp.down_proj.weight\"\n",
    "        )\n",
    "        model.trf_blocks[l].norm2.weight = assign(\n",
    "            model.trf_blocks[l].norm2.weight,\n",
    "            params[f\"model.layers.{l}.post_attention_layernorm.weight\"],\n",
    "            f\"model.layers.{l}.post_attention_layernorm.weight\"\n",
    "        )\n",
    "\n",
    "    # Load output layer weights\n",
    "    model.final_norm.weight = assign(model.final_norm.weight, params[\"model.norm.weight\"], \"model.norm.weight\")\n",
    "\n",
    "    if \"lm_head.weight\" in params.keys():\n",
    "        model.out_head.weight = assign(model.out_head.weight, params[\"lm_head.weight\"], \"lm_head.weight\")\n",
    "    else:\n",
    "        model.out_head.weight = assign(model.out_head.weight, params[\"model.embed_tokens.weight\"], \"model.embed_tokens.weight\")\n",
    "        print(\"Model uses weight tying.\")\n",
    "\n",
    "\n",
    "load_weights_into_llama(model, LLAMA3_CONFIG_8B, combined_weights)\n",
    "model.to(device);\n",
    "del combined_weights  # free up memory"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "TDuv_Us2rNvk",
   "metadata": {
    "id": "TDuv_Us2rNvk"
   },
   "source": [
    "- 接下来，我们已准备好使用 **模型进行文本生成**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "240987e8-a023-462e-9376-9edfb27559ec",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "240987e8-a023-462e-9376-9edfb27559ec",
    "outputId": "6dab0e56-40a8-45db-a096-ab2b9ee97a69"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Output text:\n",
      " Every effort has been made to trace copyright holders and to obtain their permission for the use of copyright material. The publisher apologizes for any\n"
     ]
    }
   ],
   "source": [
    "torch.manual_seed(123)\n",
    "\n",
    "token_ids = generate(\n",
    "    model=model,\n",
    "    idx=text_to_token_ids(\"Every effort\", tokenizer).to(device),\n",
    "    max_new_tokens=25,\n",
    "    context_size=LLAMA3_CONFIG_8B[\"context_length\"],\n",
    "    top_k=1,\n",
    "    temperature=0.\n",
    ")\n",
    "\n",
    "print(\"Output text:\\n\", token_ids_to_text(token_ids, tokenizer))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1203041e-4794-4157-a978-3ce80909da44",
   "metadata": {
    "id": "1203041e-4794-4157-a978-3ce80909da44"
   },
   "source": [
    "&nbsp;\n",
    "## 5. 使用指令微调的模型"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "akyo7WNyF_YL",
   "metadata": {
    "id": "akyo7WNyF_YL"
   },
   "source": [
    "- 先前我们使用的是 **预训练基础模型**；如果希望使用 **能够遵循指令的模型**，请改用 `\"meta-llama/Llama-3-8B-Instruct\"`，如下所示：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "id": "hdA-xjjdS26J",
   "metadata": {
    "id": "hdA-xjjdS26J"
   },
   "outputs": [],
   "source": [
    "# to free up memory\n",
    "\n",
    "import gc\n",
    "\n",
    "del model\n",
    "\n",
    "gc.collect()  # Run Python garbage collector\n",
    "\n",
    "if torch.cuda.is_available():\n",
    "    torch.cuda.empty_cache()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "nbvAV7vaz6yc",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/",
     "height": 145,
     "referenced_widgets": [
      "409470784b6346a981920350de4f6f28",
      "9ba6a11ffd194bf9a0900f52a7ed4d4f",
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      "e8a4b441281b4038bb0204d093411f68",
      "bdf8b693821344fc97918e6cbc31c8bf",
      "97e8877869cd4be68ff38ce745be5045",
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      "f17fa78263414ef8b414c7bf3ac03192",
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      "31d27bf34a74432f8e0dbfe9ecb76130",
      "a3137f3669b54e84be91010c9654d985",
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      "279cffe683fe4e7383062162e07ed9ed",
      "6176990205cc499f8995c71fc6b9d4df",
      "66c23ae98bcc45f18fc5c91e0e73c3e4",
      "05b502e1e3a9436297dafbb1ce7af722",
      "25977b0d89084703ad787fe9208b5aad",
      "71a84ee5fc964ec89ff2832c84735cc2",
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      "ca81071ab07446df96795a482ce0c630",
      "e0550cab24c7492787af40dc4b8576bf",
      "7015bf6f85954036aaf8cc4f1c44ea0f",
      "2a2ba3d065634484a932b8d3c212af56"
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    },
    "id": "nbvAV7vaz6yc",
    "outputId": "9e1badc9-a6c4-48b7-9125-e0810655528b"
   },
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "f7df6bbf8e63448c8a6cb5d2f6208403",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00001-of-00004.safetensors:  36%|###6      | 1.81G/4.98G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "4772f31a1c5b4c168c9aabe7a1d2bacc",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00002-of-00004.safetensors:   0%|          | 0.00/5.00G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "ad49eeb9e1204ea2bd2e371df8ccdea2",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00003-of-00004.safetensors:   0%|          | 0.00/4.92G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "951b9e81613a40a2a503f61e69677f0a",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00004-of-00004.safetensors:   0%|          | 0.00/1.17G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "combined_weights = {}\n",
    "\n",
    "for i in range(1, 5):\n",
    "    weights_file = hf_hub_download(\n",
    "        repo_id=\"meta-llama/Meta-Llama-3-8B-Instruct\",\n",
    "        filename=f\"model-0000{i}-of-00004.safetensors\",\n",
    "        local_dir=\"Llama-3-8B-Instruct\"\n",
    "    )\n",
    "    current_weights = load_file(weights_file)\n",
    "    combined_weights.update(current_weights)\n",
    "\n",
    "\n",
    "model = Llama3Model(LLAMA3_CONFIG_8B)\n",
    "load_weights_into_llama(model, LLAMA3_CONFIG_8B, combined_weights)\n",
    "model.to(device)\n",
    "del combined_weights  # free up memory"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "VlH7qYVdDKQr",
   "metadata": {
    "id": "VlH7qYVdDKQr"
   },
   "source": [
    "- **请注意**，LLaMA 3 模型在使用时，**应当匹配微调时使用的正确 Prompt 模板**（详见 **第 7 章**）。  \n",
    "- 下面是一个 **基于 Meta AI LLaMA 3 专用 [ChatFormat 代码](https://github.com/meta-llama/llama3/blob/11817d47e1ba7a4959b025eb1ca308572e0e3963/llama/tokenizer.py#L202)** 的 **分词器包装类**，用于构造 **Prompt 模板**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "id": "4be5b481-1110-46e8-a931-3988d890cf8c",
   "metadata": {
    "id": "4be5b481-1110-46e8-a931-3988d890cf8c"
   },
   "outputs": [],
   "source": [
    "class ChatFormat:\n",
    "    def __init__(self, tokenizer):\n",
    "        self.tokenizer = tokenizer\n",
    "\n",
    "    def encode_header(self, message):\n",
    "        tokens = []\n",
    "        tokens.append(self.tokenizer.special_tokens[\"<|start_header_id|>\"])\n",
    "        tokens.extend(self.tokenizer.encode(message[\"role\"], bos=False, eos=False))\n",
    "        tokens.append(self.tokenizer.special_tokens[\"<|end_header_id|>\"])\n",
    "        tokens.extend(self.tokenizer.encode(\"\\n\\n\", bos=False, eos=False))\n",
    "        return tokens\n",
    "\n",
    "    def encode(self, text):\n",
    "        message = {\n",
    "            \"role\": \"user\",\n",
    "            \"content\": text\n",
    "        }\n",
    "\n",
    "        tokens = self.encode_header(message)\n",
    "        tokens.extend(\n",
    "            self.tokenizer.encode(message[\"content\"].strip(), bos=False, eos=False)\n",
    "        )\n",
    "        tokens.append(self.tokenizer.special_tokens[\"<|eot_id|>\"])\n",
    "        return tokens\n",
    "\n",
    "    def decode(self, token_ids):\n",
    "        return self.tokenizer.decode(token_ids)\n",
    "\n",
    "\n",
    "chat_tokenizer = ChatFormat(tokenizer)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "M-dkSNvwDttN",
   "metadata": {
    "id": "M-dkSNvwDttN"
   },
   "source": [
    "- 用法如下"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "nwBrTGTsUNhn",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "nwBrTGTsUNhn",
    "outputId": "72a495b4-b872-429a-88ef-49a9b4577f0f"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[128006, 882, 128007, 271, 9906, 4435, 0, 128009]\n"
     ]
    }
   ],
   "source": [
    "token_ids = chat_tokenizer.encode(\"Hello World!\")\n",
    "print(token_ids)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "0fpmpVgYVTRZ",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/",
     "height": 36
    },
    "id": "0fpmpVgYVTRZ",
    "outputId": "bb3e819a-112a-466c-ac51-5d14a9c3475b"
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'<|start_header_id|>user<|end_header_id|>\\n\\nHello World!<|eot_id|>'"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "tokenizer.decode(token_ids)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "Wo-aUGeKDvqq",
   "metadata": {
    "id": "Wo-aUGeKDvqq"
   },
   "source": [
    "- 现在，让我们看看 **LLaMA 3 指令模型** 的实际效果：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "id": "ozGOBu6XOkEW",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "ozGOBu6XOkEW",
    "outputId": "4f689c70-bed9-46f3-a52a-aea47b641283"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Output text:\n",
      " Llamas are herbivores, which means they primarily eat plants and plant-based foods. Here are some of the things llamas like to eat:\n",
      "\n",
      "1. Grass: Llamas love to graze on grass, especially in the spring and summer months.\n",
      "2. Hay: Hay is a staple in a llama's diet. They like to eat timothy hay, alfalfa hay, and other types of hay.\n",
      "3. Grains: Llamas may also be fed grains like oats, barley, and corn. However, grains should not make up more than 10-15% of a llama's diet.\n",
      "4. Fruits and vegetables: Llamas may enjoy fruits and vegetables as treats, such as\n"
     ]
    }
   ],
   "source": [
    "torch.manual_seed(123)\n",
    "\n",
    "token_ids = generate(\n",
    "    model=model,\n",
    "    idx=text_to_token_ids(\"What do llamas eat?\", chat_tokenizer).to(device),\n",
    "    max_new_tokens=150,\n",
    "    context_size=LLAMA3_CONFIG_8B[\"context_length\"],\n",
    "    top_k=1,\n",
    "    temperature=0.\n",
    ")\n",
    "\n",
    "output_text = token_ids_to_text(token_ids, tokenizer)\n",
    "\n",
    "\n",
    "def clean_text(text, header_end=\"assistant<|end_header_id|>\\n\\n\"):\n",
    "    # Find the index of the first occurrence of \"<|end_header_id|>\"\n",
    "    index = text.find(header_end)\n",
    "\n",
    "    if index != -1:\n",
    "        # Return the substring starting after \"<|end_header_id|>\"\n",
    "        return text[index + len(header_end):].strip()  # Strip removes leading/trailing whitespace\n",
    "    else:\n",
    "        # If the token is not found, return the original text\n",
    "        return text\n",
    "\n",
    "print(\"Output text:\\n\", clean_text(output_text))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "2r5JKrO-ZOHK",
   "metadata": {
    "id": "2r5JKrO-ZOHK"
   },
   "source": [
    "&nbsp;\n",
    "# Llama 3.1 8B"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "QiQxX0XnP_iC",
   "metadata": {
    "id": "QiQxX0XnP_iC"
   },
   "source": [
    "- **在 LLaMA 3 初次发布几个月后**，Meta AI 推出了 **LLaMA 3.1** 系列模型（详细信息请参考官方博客 [《Introducing Llama 3.1: Our most capable models to date》](https://ai.meta.com/blog/meta-llama-3-1/)）。  \n",
    "- **值得庆幸的是，我们可以直接复用** 之前 **LLaMA 3 的代码** 来实现 **LLaMA 3.1 8B**。  \n",
    "\n",
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/llama3-to-llama31.webp\" width=\"700px\">\n",
    "\n",
    "- **LLaMA 3.1** 采用 **与 LLaMA 3 完全相同的架构**，**唯一的改动** 是在 **配置文件** 中 **调整 RoPE 频率缩放参数**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "X5Fg8XUHMv4M",
   "metadata": {
    "id": "X5Fg8XUHMv4M"
   },
   "outputs": [],
   "source": [
    "LLAMA3_CONFIG_8B = {\n",
    "    \"vocab_size\": 128_256,   # Vocabulary size\n",
    "    \"context_length\": 8192,  # Context length\n",
    "    \"emb_dim\": 4096,         # Embedding dimension\n",
    "    \"n_heads\": 32,           # Number of attention heads\n",
    "    \"n_layers\": 32,          # Number of layers\n",
    "    \"hidden_dim\": 14_336,    # Size of the intermediate dimension in FeedForward\n",
    "    \"n_kv_groups\": 8,        # Key-Value groups for grouped-query attention\n",
    "    \"rope_base\": 500_000.0,  # The base in RoPE's \"theta\"\n",
    "    \"rope_freq\": None,       # Additional configuration for adjusting the RoPE frequencies\n",
    "    \"dtype\": torch.bfloat16  # Lower-precision dtype to reduce memory usage\n",
    "}\n",
    "\n",
    "LLAMA31_CONFIG_8B = {\n",
    "    \"vocab_size\": 128_256,      # Vocabulary size\n",
    "    \"context_length\": 131_072,  # NEW: Larger supported context length\n",
    "    \"emb_dim\": 4096,            # Embedding dimension\n",
    "    \"n_heads\": 32,              # Number of attention heads\n",
    "    \"n_layers\": 32,             # Number of layers\n",
    "    \"hidden_dim\": 14_336,       # Size of the intermediate dimension in FeedForward\n",
    "    \"n_kv_groups\": 8,           # Key-Value groups for grouped-query attention\n",
    "    \"rope_base\": 500_000.0,     # The base in RoPE's \"theta\"\n",
    "    \"dtype\": torch.bfloat16,    # Lower-precision dtype to reduce memory usage\n",
    "    \"rope_freq\": {              # NEW: RoPE frequency scaling\n",
    "        \"factor\": 8.0,\n",
    "        \"low_freq_factor\": 1.0,\n",
    "        \"high_freq_factor\": 4.0,\n",
    "        \"original_context_length\": 8192,\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d81ee464-c112-43b0-9ee8-70df6ac942d0",
   "metadata": {},
   "source": [
    "- **减少上下文长度** 以确保模型能在 **MacBook Air** 上正常运行（如果您的设备有 **更多 RAM**，可以 **取消注释** 下面的代码行）：  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "a55a8769-1a03-4265-8fd0-15f1c423da53",
   "metadata": {
    "id": "a8bc2370-39d2-4bfe-b4c1-6bdd75fe101c"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "New RoPE theta: 31250.0\n"
     ]
    }
   ],
   "source": [
    "old_context_length = LLAMA31_CONFIG_8B[\"context_length\"]\n",
    "LLAMA31_CONFIG_8B[\"context_length\"] = 8192\n",
    "\n",
    "\n",
    "def rescale_theta(theta_old, context_length_old, context_length_new):\n",
    "    scaling_factor = context_length_new / context_length_old\n",
    "    theta_new = theta_old * scaling_factor\n",
    "    return theta_new\n",
    "\n",
    "LLAMA31_CONFIG_8B[\"rope_base\"] = rescale_theta(\n",
    "    LLAMA31_CONFIG_8B[\"rope_base\"],\n",
    "    old_context_length,\n",
    "    LLAMA31_CONFIG_8B[\"context_length\"]\n",
    ")\n",
    "\n",
    "print(\"New RoPE theta:\", LLAMA31_CONFIG_8B[\"rope_base\"])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "xa3bpMDtTdBs",
   "metadata": {
    "id": "xa3bpMDtTdBs"
   },
   "source": [
    "- 如前面的代码所示，**RoPE 方法** 通过 **正弦（sine）和余弦（cosine）函数**，将 **位置信息** 直接嵌入 **注意力机制** 中。  \n",
    "- 在 **LLaMA 3.1** 中，我们通过 **额外的配置** 对 **逆频率计算（inverse frequency calculations）** 进行了 **进一步调整**。  \n",
    "- 这些调整会影响 **不同频率分量** 在 **位置编码中的贡献**（详细解释留待以后讨论）。  \n",
    "- 现在，让我们 **实际测试 LLaMA 3.1**，首先 **清理旧模型** 以 **释放 GPU 内存**。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "7dUtYnNUOqhL",
   "metadata": {
    "id": "7dUtYnNUOqhL"
   },
   "outputs": [],
   "source": [
    "# free up memory\n",
    "del model\n",
    "\n",
    "gc.collect()  # Run Python garbage collector\n",
    "\n",
    "if torch.cuda.is_available():\n",
    "    torch.cuda.empty_cache()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "DbbVsll6TYWR",
   "metadata": {
    "id": "DbbVsll6TYWR"
   },
   "source": [
    "- 接下来，我们 **下载分词器**。  \n",
    "- **请注意**，由于 **LLaMA 3.1** 与 **LLaMA 3** **属于不同的模型系列**，您需要访问 [meta-llama/Llama-3.1-8B](https://huggingface.co/meta-llama/Llama-3.1-8B) **仓库**，并 **接受许可协议**，否则您的 **Hugging Face 访问令牌** 无法用于下载。  \n",
    "- **提示**：为简化演示，我们下面只加载 **基础模型（base model）**，如果您希望使用 **指令微调版本**，请将 `\"meta-llama/Llama-3.1-8B\"` **替换为** `\"meta-llama/Llama-3.1-8B-Instruct\"`。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "8xDk4chtPNU4",
   "metadata": {
    "id": "8xDk4chtPNU4"
   },
   "outputs": [],
   "source": [
    "tokenizer_file_path = hf_hub_download(\n",
    "    repo_id=\"meta-llama/Llama-3.1-8B\",\n",
    "    filename=\"original/tokenizer.model\",\n",
    "    local_dir=\"Llama-3.1-8B\"\n",
    ")\n",
    "\n",
    "tokenizer = Tokenizer(tokenizer_file_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "a7l21VE4Otcs",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "a7l21VE4Otcs",
    "outputId": "3dd5cfba-bf3f-44d2-9be1-7cd42bfe4ba9"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Total number of parameters: 8,030,261,248\n"
     ]
    }
   ],
   "source": [
    "model = Llama3Model(LLAMA31_CONFIG_8B)\n",
    "\n",
    "total_params = sum(p.numel() for p in model.parameters())\n",
    "print(f\"Total number of parameters: {total_params:,}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "id": "u4J7IxOvOyPM",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/",
     "height": 145,
     "referenced_widgets": [
      "5bbaa046d8934c8fae0a12c3d7bd991b",
      "e1e4125eac004bae92dc1f22f673bf0e",
      "d5b4bb4891ec4e44be46e9815c7e10dc",
      "4f6595a392b244bd8e887935defc06f0",
      "100c1b15cc4046cea1147f657eb2d8d0",
      "81458e7953a349cfafccaa213b370406",
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      "f55b59efcefa4ad5955d082f4bf7c637",
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      "02ad170019454fd096b37347de5c481d",
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      "080c484114f64f5591fa1287a35b46c9",
      "14dc6a3717484c55a116612e28447dbb",
      "00d3286c9c1d4161bb777b7b65ae744d",
      "66f27fb11edf453b8144c2dfcdc66baa",
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      "94073be250cd42d5b82e196e30cbf22e",
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      "f0d9febe1a634a0ba7e8e50fa104dcc2",
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      "87da9905a0534c26ad0712ad426ca930",
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      "a06dcb3bdfc84905a7222066c32fe500",
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      "dc5d555099f64a998514ebde90eeb6df",
      "ef93a2f58cc54373941f43658bb808cf",
      "fea1e2327d2944859af3d91c216b9008",
      "320c00a5d18c45ccae634d166f1bd810",
      "6c857e69d5204cd3b7c3bf426993ad1f",
      "2145e47428f1446fba3e62b3cde0a7f5",
      "3d519ce3562c4e249bf392c7f43d04c0",
      "cc20ffcf0c1a4656945959bf457dfd84"
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    },
    "id": "u4J7IxOvOyPM",
    "outputId": "925348d7-fc69-4d1b-90f1-7029426bcfcf"
   },
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "eabfde3ef38b436ea750e6fb50a02b5c",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00001-of-00004.safetensors:   0%|          | 0.00/4.98G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "e117ad45771747ae95c16f9876e6dc19",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00002-of-00004.safetensors:   0%|          | 0.00/5.00G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "170185f2f046437dab57c2ad23163c5c",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00003-of-00004.safetensors:   0%|          | 0.00/4.92G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "6e65f5d6c5af4ab78bc7b3778b98ef86",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "model-00004-of-00004.safetensors:   0%|          | 0.00/1.17G [00:00<?, ?B/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "combined_weights = {}\n",
    "\n",
    "for i in range(1, 5):\n",
    "    weights_file = hf_hub_download(\n",
    "        repo_id=\"meta-llama/Llama-3.1-8B\",\n",
    "        filename=f\"model-0000{i}-of-00004.safetensors\",\n",
    "        local_dir=\"Llama-3.1-8B\"\n",
    "    )\n",
    "    current_weights = load_file(weights_file)\n",
    "    combined_weights.update(current_weights)\n",
    "\n",
    "load_weights_into_llama(model, LLAMA31_CONFIG_8B, combined_weights)\n",
    "model.to(device);\n",
    "del combined_weights  # free up memory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "id": "wJFnF8ATPbtD",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "wJFnF8ATPbtD",
    "outputId": "67d5cb66-3588-4fd4-ac75-39bfe3aa82d8"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Output text:\n",
      " Every effort has been made to trace copyright holders and to obtain their permission for the use of copyright material. The publisher apologizes for any\n"
     ]
    }
   ],
   "source": [
    "torch.manual_seed(123)\n",
    "\n",
    "token_ids = generate(\n",
    "    model=model,\n",
    "    idx=text_to_token_ids(\"Every effort\", tokenizer).to(device),\n",
    "    max_new_tokens=25,\n",
    "    context_size=LLAMA31_CONFIG_8B[\"context_length\"],\n",
    "    top_k=1,\n",
    "    temperature=0.\n",
    ")\n",
    "\n",
    "print(\"Output text:\\n\", token_ids_to_text(token_ids, tokenizer))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "DR9NBDUjPrDp",
   "metadata": {
    "id": "DR9NBDUjPrDp"
   },
   "source": [
    "&nbsp;\n",
    "# Llama 3.2 1B"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "imoxFiDzJcxk",
   "metadata": {
    "id": "imoxFiDzJcxk"
   },
   "source": [
    "- 截至目前，**Meta AI 最新发布的模型** 是 **LLaMA 3.2** 系列，官方公告见 [这里](https://ai.meta.com/blog/llama-3-2-connect-2024-vision-edge-mobile-devices/)。  \n",
    "- **LLaMA 3.2 文本模型的代码** 与 **LLaMA 3.1** **基本相似**，但有以下 **两大变化**：\n",
    "  1. **模型尺寸缩小**，提供 **1B 和 3B 版本**（相比 LLaMA 3.1 8B 更轻量）。  \n",
    "  2. **重新引入权重共享（Weight Tying）**，这一方法最早应用于 **GPT-2 架构**，它 **复用输入（token）嵌入层和输出层的权重参数**，从而提高效率。  \n",
    "- **LLaMA 3.2 1B 版本体积较小，可在许多移动设备上运行**，极大提升了部署灵活性。  \n",
    "- **下图展示了 LLaMA 3.1 8B 与 LLaMA 3.2 1B 之间的架构差异**：  "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "OL1EoXQ6TPb7",
   "metadata": {
    "id": "OL1EoXQ6TPb7"
   },
   "source": [
    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/bonus/gpt-to-llama/llama31-to-llama32.webp?1\" width=\"700px\">"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "K0KgjwCCJ9Fb",
   "metadata": {
    "id": "K0KgjwCCJ9Fb"
   },
   "source": [
    "- 从上图可以看出，**LLaMA 3.1 8B** 与 **LLaMA 3.2 1B** **架构的主要区别** 在于 **模型尺寸**。  \n",
    "- **另一个小改动** 是 **RoPE 重新缩放因子（RoPE Rescaling Factor）增加**，这一变化已在 **配置文件** 中体现。  \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "Yv_yF3NCQTBx",
   "metadata": {
    "id": "Yv_yF3NCQTBx"
   },
   "outputs": [],
   "source": [
    "LLAMA31_CONFIG_8B = {\n",
    "    \"vocab_size\": 128_256,      # Vocabulary size\n",
    "    \"context_length\": 131_072,  # NEW: Larger supported context length\n",
    "    \"emb_dim\": 4096,            # Embedding dimension\n",
    "    \"n_heads\": 32,              # Number of attention heads\n",
    "    \"n_layers\": 32,             # Number of layers\n",
    "    \"hidden_dim\": 14_336,       # Size of the intermediate dimension in FeedForward\n",
    "    \"n_kv_groups\": 8,           # Key-Value groups for grouped-query attention\n",
    "    \"rope_base\": 500_000.0,     # The base in RoPE's \"theta\"\n",
    "    \"dtype\": torch.bfloat16,    # Lower-precision dtype to reduce memory usagey\n",
    "    \"rope_freq\": {              # NEW: RoPE frequency scaling\n",
    "        \"factor\": 8.0,\n",
    "        \"low_freq_factor\": 1.0,\n",
    "        \"high_freq_factor\": 4.0,\n",
    "        \"original_context_length\": 8192,\n",
    "    }\n",
    "}\n",
    "\n",
    "\n",
    "LLAMA32_CONFIG_1B = {\n",
    "    \"vocab_size\": 128_256,      # Vocabulary size\n",
    "    \"context_length\": 131_072,  # Context length\n",
    "    \"emb_dim\": 2048,            # NEW: Half the embedding dimension\n",
    "    \"n_heads\": 32,              # Number of attention heads\n",
    "    \"n_layers\": 16,             # NEW: Half the number of layers\n",
    "    \"hidden_dim\": 8192,         # NEW: Almost half the size of the intermediate dimension in FeedForward\n",
    "    \"n_kv_groups\": 8,           # Key-Value groups for grouped-query attention\n",
    "    \"rope_base\": 500_000.0,     # The base in RoPE's \"theta\"\n",
    "    \"dtype\": torch.bfloat16,    # Lower-precision dtype to reduce memory usage\n",
    "    \"rope_freq\": {              # RoPE frequency scaling\n",
    "        \"factor\": 32.0,         # NEW: Adjustment of the rescaling factor\n",
    "        \"low_freq_factor\": 1.0,\n",
    "        \"high_freq_factor\": 4.0,\n",
    "        \"original_context_length\": 8192,\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b5cd351b-d883-460d-9cdc-47e15ddb884a",
   "metadata": {},
   "source": [
    "- **减少上下文长度** 以确保模型能在 **MacBook Air** 上正常运行（如果您的设备有 **更多 RAM**，可以 **取消注释** 下面的代码行）：  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "73f001a6-7ae0-4204-aa83-a27a8878dfd2",
   "metadata": {
    "id": "a8bc2370-39d2-4bfe-b4c1-6bdd75fe101c"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "New RoPE theta: 31250.0\n"
     ]
    }
   ],
   "source": [
    "old_context_length = LLAMA32_CONFIG_1B[\"context_length\"]\n",
    "LLAMA32_CONFIG_1B[\"context_length\"] = 8192\n",
    "\n",
    "LLAMA32_CONFIG_1B[\"rope_base\"] = rescale_theta(\n",
    "    LLAMA32_CONFIG_1B[\"rope_base\"],\n",
    "    old_context_length,\n",
    "    LLAMA32_CONFIG_1B[\"context_length\"]\n",
    ")\n",
    "\n",
    "print(\"New RoPE theta:\", LLAMA32_CONFIG_1B[\"rope_base\"])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "Dl4_0EoJKKYv",
   "metadata": {
    "id": "Dl4_0EoJKKYv"
   },
   "source": [
    "- 下面，我们可以 **复用 LLaMA 3.1 8B 章节的代码** 来加载 **LLaMA 3.2 1B** 模型。  \n",
    "- **请注意**，由于 **LLaMA 3.2** **属于不同的模型系列**，您需要访问 [meta-llama/Llama-3.2-1B](https://huggingface.co/meta-llama/Llama-3.2-1B) **仓库**，并 **接受许可协议**，否则您的 **Hugging Face 访问令牌** 无法用于下载。  \n",
    "- **提示**：为简化演示，我们下面只加载 **基础模型（base model）**，如果您希望使用 **指令微调版本**，请将 `\"meta-llama/Llama-3.2-1B\"` **替换为** `\"meta-llama/Llama-3.2-1B-Instruct\"`。  "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "id": "tCstHgyRRD2x",
   "metadata": {
    "id": "tCstHgyRRD2x"
   },
   "outputs": [],
   "source": [
    "# free up memory\n",
    "del model\n",
    "\n",
    "\n",
    "gc.collect()  # Run Python garbage collector\n",
    "\n",
    "if torch.cuda.is_available():\n",
    "    torch.cuda.empty_cache()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "id": "jt8BKAHXRCPI",
   "metadata": {
    "id": "jt8BKAHXRCPI"
   },
   "outputs": [],
   "source": [
    "tokenizer_file_path = hf_hub_download(\n",
    "    repo_id=\"meta-llama/Llama-3.2-1B\",\n",
    "    filename=\"original/tokenizer.model\",\n",
    "    local_dir=\"Llama-3.2-1B\"\n",
    ")\n",
    "\n",
    "tokenizer = Tokenizer(tokenizer_file_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "id": "uf8KjasmRFSt",
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   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Total number of parameters: 1,498,482,688\n",
      "\n",
      "Total number of unique parameters: 1,235,814,400\n"
     ]
    }
   ],
   "source": [
    "model = Llama3Model(LLAMA32_CONFIG_1B)\n",
    "\n",
    "total_params = sum(p.numel() for p in model.parameters())\n",
    "print(f\"Total number of parameters: {total_params:,}\")\n",
    "\n",
    "# Account for weight tying\n",
    "total_params_normalized = total_params - model.tok_emb.weight.numel()\n",
    "print(f\"\\nTotal number of unique parameters: {total_params_normalized:,}\")"
   ]
  },
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       "model.safetensors:   0%|          | 0.00/2.47G [00:00<?, ?B/s]"
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     "text": [
      "Model uses weight tying.\n"
     ]
    }
   ],
   "source": [
    "weights_file = hf_hub_download(\n",
    "    repo_id=\"meta-llama/Llama-3.2-1B\",\n",
    "    filename=f\"model.safetensors\",\n",
    "    local_dir=\"Llama-3.2-1B\"\n",
    ")\n",
    "current_weights = load_file(weights_file)\n",
    "\n",
    "load_weights_into_llama(model, LLAMA32_CONFIG_1B, current_weights)\n",
    "model.to(device);\n",
    "del current_weights  # free up memory"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "id": "pPp5yjir6FYJ",
   "metadata": {
    "colab": {
     "base_uri": "https://localhost:8080/"
    },
    "id": "pPp5yjir6FYJ",
    "outputId": "6c8e79d2-0769-43a7-93b3-f04c030e1aac"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Weight tying: True\n"
     ]
    }
   ],
   "source": [
    "print(\"Weight tying:\", torch.equal(model.tok_emb.weight, model.out_head.weight))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "id": "3kh7yrw2W4qr",
   "metadata": {
    "colab": {
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    "id": "3kh7yrw2W4qr",
    "outputId": "b7e66a17-57ec-4b0e-c4ff-8d9a6b8e6ea5"
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Output text:\n",
      " Every effort is made to ensure that the information on this website is accurate. However, we cannot guarantee that the information is accurate, complete\n"
     ]
    }
   ],
   "source": [
    "torch.manual_seed(123)\n",
    "\n",
    "token_ids = generate(\n",
    "    model=model,\n",
    "    idx=text_to_token_ids(\"Every effort\", tokenizer).to(device),\n",
    "    max_new_tokens=25,\n",
    "    context_size=LLAMA32_CONFIG_1B[\"context_length\"],\n",
    "    top_k=1,\n",
    "    temperature=0.\n",
    ")\n",
    "\n",
    "print(\"Output text:\\n\", token_ids_to_text(token_ids, tokenizer))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "VO4Qf0zyW1ZC",
   "metadata": {
    "id": "VO4Qf0zyW1ZC"
   },
   "source": [
    "&nbsp;\n",
    "# 展望"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "CjCewpo2XPAd",
   "metadata": {
    "id": "CjCewpo2XPAd"
   },
   "source": [
    "- 本笔记本至此完成了 **从 GPT 到 LLaMA 3.2 的转换**。  \n",
    "- 如果您希望获取一个 **更紧凑、独立的 LLaMA 3.2 代码笔记本**，请参考 [standalone-llama32.ipynb](standalone-llama32.ipynb)。  "
   ]
  }
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