Dynamic-fork scheduling, Medusa/MTP spec decode, and InternVL resize for HPD-Parsing (based on v0.17.1)#48715
Dynamic-fork scheduling, Medusa/MTP spec decode, and InternVL resize for HPD-Parsing (based on v0.17.1)#48715wwwjjjj wants to merge 18 commits into
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Signed-off-by: Kunshang Ji <kunshang.ji@intel.com> (cherry picked from commit a8f66cb)
Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk> (cherry picked from commit 7196348)
…r leading to encoder_cache_size is 0 (vllm-project#35994) Signed-off-by: Miao, Avery <avery.miao@intel.com> (cherry picked from commit e998fa7)
…roject#35136) Signed-off-by: dougbtv <dosmith@redhat.com> Co-authored-by: Daniele Trifirò <dtrifiro@redhat.com> (cherry picked from commit 0bfa229)
Signed-off-by: khluu <khluu000@gmail.com>
… FP8 (vllm-project#36017) Signed-off-by: amitz-nv <203509407+amitz-nv@users.noreply.github.com> (cherry picked from commit d7adcad)
Signed-off-by: Shaun Kotek - Nvidia <skotek@nvidia.com> Signed-off-by: Natan Bagrov <nbagrov@nvidia.com> Signed-off-by: Daniel Serebrenik <daserebrenik@nvidia.com> Signed-off-by: zjy0516 <riverclouds.zhu@qq.com> Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com> Signed-off-by: yewentao256 <zhyanwentao@126.com> Signed-off-by: Wentao Ye <44945378+yewentao256@users.noreply.github.com> Signed-off-by: liweiguang <codingpunk@gmail.com> Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io> Signed-off-by: wang.yuqi <noooop@126.com> Signed-off-by: Alex Brooks <albrooks@redhat.com> Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk> Signed-off-by: cong-or <conchubhar.gannon@gmail.com> Signed-off-by: Tushar Shetty <tushar.shetty@abbyy.com> Signed-off-by: Tushar Shetty <54362365+tusharshetty61@users.noreply.github.com> Signed-off-by: jiang1.li <jiang1.li@intel.com> Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com> Signed-off-by: Xin Yang <xyangx@amazon.com> Signed-off-by: Kevin H. Luu <khluu000@gmail.com> Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn> Co-authored-by: nvnbagrov <nbagrov@nvidia.com> Co-authored-by: Sage <80211083+sagearc@users.noreply.github.com> Co-authored-by: danisereb <daserebrenik@nvidia.com> Co-authored-by: Jiangyun Zhu <riverclouds.zhu@qq.com> Co-authored-by: Kunshang Ji <kunshang.ji@intel.com> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com> Co-authored-by: Wentao Ye <44945378+yewentao256@users.noreply.github.com> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> Co-authored-by: Weiguang Li <codingpunk@gmail.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Li, Jiang <jiang1.li@intel.com> Co-authored-by: wang.yuqi <yuqi.wang@daocloud.io> Co-authored-by: Alex Brooks <albrooks@redhat.com> Co-authored-by: Cyrus Leung <tlleungac@connect.ust.hk> Co-authored-by: cong-or <conchubhar.gannon@gmail.com> Co-authored-by: Tushar Shetty <54362365+tusharshetty61@users.noreply.github.com> Co-authored-by: liuzhenwei <zhenwei.liu@intel.com> Co-authored-by: Xin Yang <105740670+xyang16@users.noreply.github.com> Co-authored-by: Kevin H. Luu <khluu000@gmail.com> Co-authored-by: Isotr0py <mozf@mail2.sysu.edu.cn> (cherry picked from commit fa02820)
Signed-off-by: Amir Klein <203507526+amirkl94@users.noreply.github.com> (cherry picked from commit 156e335)
…ject#35219) Signed-off-by: Vadim Gimpelson <vadim.gimpelson@gmail.com> (cherry picked from commit 4ff8c3c)
Signed-off-by: Shaun Kotek - Nvidia <skotek@nvidia.com> Co-authored-by: root <root@gpu-259.slurm-workers-slurm.slurm.svc.cluster.local> (cherry picked from commit 203a7f2)
This reverts commit 8e39d39.
Signed-off-by: wzhao18 <wzhao18.sz@gmail.com> Co-authored-by: Robert Shaw <114415538+robertgshaw2-redhat@users.noreply.github.com> (cherry picked from commit 84e436e)
Signed-off-by: Benjamin Chislett <bchislett@nvidia.com> (cherry picked from commit 9040cd4)
Signed-off-by: khluu <khluu000@gmail.com> (cherry picked from commit 82b110d)
Signed-off-by: Shaun Kotek - Nvidia <skotek@nvidia.com> Co-authored-by: root <root@gpu-259.slurm-workers-slurm.slurm.svc.cluster.local> (cherry picked from commit 203a7f2)
Signed-off-by: Roi Koren <roik@nvidia.com> (cherry picked from commit e661b9e)
Three independent features running on top of v0.17.1:
1) Scheduling for Layout-Coordinated Branch Decoding Paradigm:
- Fork requests on fork_token_id (read from HF config), parent-child
tracking and output aggregation
- Fork-aware scheduling: KV-cache admission threshold for parents,
child running-overflow slots, FCFS-by-family waiting-queue priority
- Fork KV-cache sharing + Mamba state copy
- Touches scheduler / request / outputs / input_processor /
kv_cache_manager / single_type_kv_cache_manager / kv_cache_coordinator /
mamba_utils
2) P-MTP speculative decoding:
- Medusa model + v1 spec_decode path, Qwen3 mtp weight skipping,
speculative config plumbing
3) InternVL image resize / tiling strategy:
- New _find_closest_aspect_ratio_optim (top-k by area, then closest
aspect ratio, with ar_threshold), gated by env MAX_PATCHES_WITH_RESIZE
Signed-off-by: wwwjjjj <2854851098@qq.com>
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| super().__init__() | ||
| self.config = config | ||
| print('weishu debug medusa model load vllm_config', vllm_config) |
There was a problem hiding this comment.
⚪ Severity: LOW
Debug print() unconditionally dumps the full vllm_config object (which may include model paths, parallelism settings, quantization config, and speculative-decode secrets) to stdout/logs on every Medusa model initialization. This leaks internal server configuration to anyone with log access.
Helpful? Add 👍 / 👎
💡 Fix Suggestion
Suggestion: Remove the debug print() statement at line 382. This is leftover development code (prefixed 'weishu debug') that unconditionally dumps vllm_config to stdout on every Medusa model initialization, leaking internal server configuration details to logs. The validation notes additional debug prints at lines 387, 451, and 455 that should also be removed.
⚠️ Experimental Feature: This code suggestion is automatically generated. Please review carefully.
| print('weishu debug medusa model load vllm_config', vllm_config) |
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This pull request has merge conflicts that must be resolved before it can be |
| self.target_parallel_config, self.draft_tensor_parallel_size | ||
| ) | ||
| ) | ||
| self.method = "medusa" |
There was a problem hiding this comment.
🟡 Severity: MEDIUM
self.method = "medusa" is placed at indentation level 8 (same as the top-level if/elif/else chain), so it executes unconditionally at the end of __post_init__, overriding whichever speculative decoding method was correctly detected (eagle, eagle3, mtp, mlp_speculator, etc.). This silently bypasses all method-specific validation and forces incorrect draft model execution.
Helpful? Add 👍 / 👎
💡 Fix Suggestion
Suggestion: Remove the stale/misindented line self.method = "medusa" at line 592. The medusa method is already correctly assigned conditionally at line 479 (elif self.draft_model_config.hf_config.model_type == "medusa": self.method = "medusa"). This leftover line executes unconditionally and overrides whichever speculative decoding method was correctly detected. Simply delete line 592 so that only return self remains.
⚠️ Experimental Feature: This code suggestion is automatically generated. Please review carefully.
| self.method = "medusa" | |
| return self |
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| super().__init__() | ||
| self.config = config | ||
| print('weishu debug medusa model load vllm_config', vllm_config) |
There was a problem hiding this comment.
⚪ Severity: LOW
Debug print statement dumps the entire vllm_config object (which may contain model paths, parallelism settings, quantization config, and other deployment-sensitive details) to stdout/logs in production. This developer debug output was left in accidentally and should not ship.
Helpful? Add 👍 / 👎
💡 Fix Suggestion
Suggestion: Remove the debug print statement at line 382. This is clearly accidental developer debug output (it even includes the developer's name 'weishu') that dumps the entire vllm_config object to stdout. Additionally, remove the other debug print block at lines 387–390 ([MEDUSA DEBUG] Medusa init: ...), which also leaks deployment configuration details. The commented-out debug block at lines 447–456 should also be cleaned up.
⚠️ Experimental Feature: This code suggestion is automatically generated. Please review carefully.
| print('weishu debug medusa model load vllm_config', vllm_config) | |
| self.num_mtp_tokens = vllm_config.speculative_config.num_speculative_tokens | |
| self.model = Qwen3_5MultiTokenPredictor( | |
| vllm_config=vllm_config, prefix=maybe_prefix(prefix, "mtp") | |
| ) |
13 participants
Purpose
Prototype of three features built for HPD-Parsing serving, currently running
on vLLM v0.17.1. Opening this PR to gauge upstream interest and get direction
on how to align with
mainbefore investing in the full port.Proposed changes (3 independent features)
1. Layout-Coordinated Branch Decoding (dynamic-fork scheduling)
Fork a request into child branches at a configurable
fork_token_id(read fromHF config), track parent/child relationships, aggregate outputs, and share KV
cache between parent and children. Fork-aware scheduling adds a parent KV-cache
admission threshold, child running-overflow slots, and FCFS-by-family ordering
of the waiting queue.
vllm/v1/core/sched/scheduler.pyvllm/v1/core/sched/async_scheduler.pyvllm/v1/core/sched/output.pyvllm/v1/request.pyvllm/v1/outputs.pyvllm/v1/engine/input_processor.pyvllm/v1/core/kv_cache_manager.pyvllm/v1/core/single_type_kv_cache_manager.pyvllm/v1/core/kv_cache_coordinator.pyvllm/v1/worker/mamba_utils.pyvllm/v1/worker/gpu_model_runner.py2. Medusa / MTP speculative decoding
vllm/model_executor/models/medusa.pyvllm/v1/spec_decode/medusa.pyvllm/model_executor/models/qwen3.py(skipmtpweights)vllm/config/speculative.py3. InternVL image resize / tiling strategy
New
_find_closest_aspect_ratio_optim(top-k by area, then closest aspect ratio,with
ar_threshold), gated by envMAX_PATCHES_WITH_RESIZE.vllm/model_executor/models/internvl.pyFull change vs v0.17.1: 16 files, +1973 / -210.