Add cu129_torch28 (#19)

Author: spectralflight

ATTRIBUTIONS.md

@@ -6,6 +6,8 @@ Index URLs:
 
 * [all](https://nvidia-cosmos.github.io/cosmos-dependencies/v1.2.0/simple)
 * [cu126_torch29](https://nvidia-cosmos.github.io/cosmos-dependencies/v1.2.0/cu126_torch29/simple)
+* [cu128_torch29](https://nvidia-cosmos.github.io/cosmos-dependencies/v1.2.0/cu128_torch29/simple)
+* [cu129_torch28](https://nvidia-cosmos.github.io/cosmos-dependencies/v1.2.0/cu129_torch28/simple)
 * [cu130_torch29](https://nvidia-cosmos.github.io/cosmos-dependencies/v1.2.0/cu126_torch29/simple)
 
 ## Setup

README.md

@@ -51,8 +51,8 @@ uv pip install "torch==${TORCH_VERSION}.*" --index-url "https://download.pytorch
 
 # Set build environment variables
 eval "$(python -c "
-import torch
-print(f'export _GLIBCXX_USE_CXX11_ABI={1 if torch.compiled_with_cxx11_abi() else 0}')
+from cosmos_dependencies.build import build_env
+build_env()
 ")"
 
 # Configure ccache

assets/cu128_torch28.txt renamed to assets/cu128_torch29.txt

@@ -0,0 +1,38 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import torch
+
+
+def _parse_torch_cuda_arch(name: str) -> tuple[int, int]:
+    """Parse CUDA architecture from a string of the form sm_<major><minor>."""
+    name = name.removeprefix("sm_")
+    major = int(name[:-1])
+    minor = int(name[-1])
+    return major, minor
+
+
+def _get_torch_cuda_arch_list() -> list[tuple[int, int]]:
+    """Get the list of CUDA architectures supported by PyTorch."""
+    arch_list = torch.cuda.get_arch_list()
+    return [_parse_torch_cuda_arch(x) for x in arch_list if x.startswith("sm_")]
+
+
+def build_env() -> None:
+    """Print the build environment variables."""
+    _GLIBCXX_USE_CXX11_ABI = 1 if torch.compiled_with_cxx11_abi() else 0
+    print(f"export _GLIBCXX_USE_CXX11_ABI={_GLIBCXX_USE_CXX11_ABI}")
+    TORCH_CUDA_ARCH_LIST = ";".join([f"{major}.{minor}" for major, minor in _get_torch_cuda_arch_list()])
+    print(f"export TORCH_CUDA_ARCH_LIST='{TORCH_CUDA_ARCH_LIST}'")

assets/cu129_torch28.txt

@@ -0,0 +1,26 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from cosmos_dependencies.build import _parse_torch_cuda_arch, build_env
+
+
+def test_parse_torch_cuda_arch():
+    assert _parse_torch_cuda_arch("sm_80") == (8, 0)
+    assert _parse_torch_cuda_arch("sm_86") == (8, 6)
+    assert _parse_torch_cuda_arch("sm_120") == (12, 0)
+
+
+def test_print_build_env():
+    build_env()