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[None][feat] Return topk logprobs in torch backend#7756
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[None][feat] Return topk logprobs in torch backend#7756
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Signed-off-by: Dong Cao <docao@nvidia.com>
…topk_logprobs_torch_backendSigned-off-by: Dong Cao <docao@nvidia.com>
Signed-off-by: Dong Cao <docao@nvidia.com>
coderabbitaibot commentedSep 16, 2025 • edited
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📝 WalkthroughWalkthroughAdds end-to-end support for top‑k token log probabilities: introduces a logprobs parameter in sampling, plumbs it through workers and request objects, computes per-step top‑k logprobs in the sampler via log_softmax, removes prior constraint (logprobs > 1), and adds a unit test validating structure and ordering. Changes
Sequence Diagram(s)sequenceDiagram autonumber participant Client participant LLMAPI as LLM API participant Scaff as Scaffolding Worker participant Exec as Executor Worker participant Req as LlmRequest participant Sampler Client->>LLMAPI: generate(prompt, SamplingParams{logprobs=N}) LLMAPI-->>LLMAPI: validate args (no N==1 restriction) LLMAPI->>Scaff: task params Scaff-->>Scaff: build SamplingParams(..., logprobs=N) Scaff->>Exec: enqueue with SamplingParams Exec-->>Exec: set py_num_logprobs = SamplingParams.logprobs Exec->>Req: construct LlmRequest(..., num_logprobs=N) loop decode steps Sampler->>Sampler: log_softmax(raw_logits) alt logprobs requested Sampler-->>Sampler: topk per step (vals, indices) Sampler-->>Req: store py_topk_logprobs_vals/indices end end Sampler-->>Client: outputs with per-token top‑k logprobsEstimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes ✨ Finishing touches
🧪 Generate unit tests
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Actionable comments posted: 6
🧹 Nitpick comments (7)
tensorrt_llm/executor/worker.py (1)
1-1:Missing NVIDIA Apache-2.0 header (2025).Add the required copyright/license header per repo convention.
tests/unittest/llmapi/test_llm_pytorch.py (1)
1-1:Missing NVIDIA Apache-2.0 header (2025).Add the required copyright/license header per repo convention.
tensorrt_llm/_torch/pyexecutor/llm_request.py (1)
1-1:Missing NVIDIA Apache-2.0 header (2025).Add the required copyright/license header per repo convention.
tensorrt_llm/scaffolding/worker.py (2)
184-186:Minor: coerce task.num_logprobs to int for SamplingParamsProtect against float/str inputs from upstream task sources.
Apply this diff:
- return_context_logits=task.return_context_logits,- logprobs=task.num_logprobs)+ return_context_logits=task.return_context_logits,+ logprobs=(int(task.num_logprobs) if task.num_logprobs is not None else None))
1-1:Missing NVIDIA Apache-2.0 header (2025).Add the required copyright/license header per repo convention.
tensorrt_llm/_torch/pyexecutor/sampler.py (2)
590-594:Type: log_probs_host is a boolean nowFix the signature/type to avoid confusion and accidental tensor operations.
Apply this diff:
- def log_probs_host(self, scheduled_requests: ScheduledRequests):+ def log_probs_host(self, scheduled_requests: ScheduledRequests) -> bool:And in
_process_requests:- log_probs_host: torch.Tensor | None = None):+ log_probs_host: bool = False):
1-1:Missing NVIDIA Apache-2.0 header (2025).Add the required copyright/license header per repo convention.
📜 Review details
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📒 Files selected for processing (6)
tensorrt_llm/_torch/pyexecutor/llm_request.py(3 hunks)tensorrt_llm/_torch/pyexecutor/sampler.py(7 hunks)tensorrt_llm/executor/worker.py(1 hunks)tensorrt_llm/llmapi/llm.py(0 hunks)tensorrt_llm/scaffolding/worker.py(1 hunks)tests/unittest/llmapi/test_llm_pytorch.py(1 hunks)
💤 Files with no reviewable changes (1)
- tensorrt_llm/llmapi/llm.py
🧰 Additional context used
📓 Path-based instructions (3)
**/*.{h,hpp,hh,hxx,cpp,cxx,cc,cu,cuh,py}
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tensorrt_llm/executor/worker.pytests/unittest/llmapi/test_llm_pytorch.pytensorrt_llm/scaffolding/worker.pytensorrt_llm/_torch/pyexecutor/llm_request.pytensorrt_llm/_torch/pyexecutor/sampler.py
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Files:
tensorrt_llm/executor/worker.pytests/unittest/llmapi/test_llm_pytorch.pytensorrt_llm/scaffolding/worker.pytensorrt_llm/_torch/pyexecutor/llm_request.pytensorrt_llm/_torch/pyexecutor/sampler.py
**/*.{cpp,cxx,cc,h,hpp,hh,hxx,cu,cuh,py}
📄 CodeRabbit inference engine (CODING_GUIDELINES.md)
Prepend the NVIDIA Apache-2.0 copyright header with current year to the top of all source files (e.g., .cpp, .h, .cu, .py).
Files:
tensorrt_llm/executor/worker.pytests/unittest/llmapi/test_llm_pytorch.pytensorrt_llm/scaffolding/worker.pytensorrt_llm/_torch/pyexecutor/llm_request.pytensorrt_llm/_torch/pyexecutor/sampler.py
🧠 Learnings (1)
📚 Learning: 2025-08-28T10:25:22.370Z
Learnt from: ixlmarPR: NVIDIA/TensorRT-LLM#7294File: tensorrt_llm/_torch/pyexecutor/sampler.py:887-891Timestamp: 2025-08-28T10:25:22.370ZLearning: In tensorrt_llm/_torch/pyexecutor/sampler.py, the draft_probs and target_probs tensors have shapes [1, steps] not [steps, vocab_size] as might be expected, making the .squeeze(0) operations appropriate for removing the batch dimension of size 1.Applied to files:
tensorrt_llm/_torch/pyexecutor/sampler.py
🧬 Code graph analysis (4)
tensorrt_llm/executor/worker.py (1)
tensorrt_llm/scaffolding/task.py (1)
logprobs(99-100)
tests/unittest/llmapi/test_llm_pytorch.py (4)
tensorrt_llm/llmapi/llm.py (1)
generate(238-316)tensorrt_llm/sampling_params.py (1)
SamplingParams(125-486)tensorrt_llm/scaffolding/task.py (1)
logprobs(99-100)tensorrt_llm/executor/result.py (1)
outputs(198-213)
tensorrt_llm/scaffolding/worker.py (2)
tests/unittest/llmapi/test_llm.py (6)
task(480-487)task(527-532)task(1862-1871)task(1965-1978)task(2326-2327)task(2417-2436)tensorrt_llm/scaffolding/task.py (1)
logprobs(99-100)
tensorrt_llm/_torch/pyexecutor/sampler.py (2)
tensorrt_llm/executor/result.py (1)
Logprob(37-40)tensorrt_llm/_torch/pyexecutor/scheduler.py (1)
all_requests(38-39)
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WeiHaocheng commentedSep 16, 2025
/bot run |
tensorrt-cicd commentedSep 16, 2025
PR_Github #18737 [ run ] triggered by Bot |
tensorrt-cicd commentedSep 16, 2025
PR_Github #18737 [ run ] completed with state |
fb6f39f to2aaf2a7CompareWeiHaocheng commentedSep 17, 2025
/bot run |
tensorrt-cicd commentedSep 17, 2025
PR_Github #18876 [ run ] triggered by Bot |
tensorrt-cicd commentedSep 17, 2025
PR_Github #18876 [ run ] completed with state |
Signed-off-by: Dong Cao <docao@nvidia.com>
Signed-off-by: Dong Cao <docao@nvidia.com>
e3d28ab toe01e84dCompareWeiHaocheng commentedSep 17, 2025
/bot run |
tensorrt-cicd commentedSep 17, 2025
PR_Github #18924 [ run ] triggered by Bot |
b872425 to95d23f4Compare…gprobs_torch_backendSigned-off-by: Dong Cao <docao@nvidia.com>
dcaox commentedSep 22, 2025
/bot run --disable-fail-fast |
1 similar comment
WeiHaocheng commentedSep 22, 2025
/bot run --disable-fail-fast |
tensorrt-cicd commentedSep 22, 2025
PR_Github #19573 [ run ] triggered by Bot |
dcaox commentedSep 23, 2025
/bot run --disable-fail-fast |
tensorrt-cicd commentedSep 23, 2025
PR_Github #19634 [ run ] triggered by Bot |
tensorrt-cicd commentedSep 23, 2025
PR_Github #19573 [ run ] completed with state |
tensorrt-cicd commentedSep 23, 2025
PR_Github #19634 [ run ] completed with state |
…gprobs_torch_backendSigned-off-by: Dong Cao <docao@nvidia.com>
…gprobs_torch_backendSigned-off-by: Dong Cao <docao@nvidia.com>
dcaox commentedSep 24, 2025
/bot reuse-pipeline |
tensorrt-cicd commentedSep 24, 2025
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2f8dc6f intoNVIDIA:mainUh oh!
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…)"This reverts commit2f8dc6f.Signed-off-by: Iman Tabrizian <10105175+tabrizian@users.noreply.github.com>
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