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[TRTLLM-14022][feat] BREAKING: DON'T REVIEW Remove legacy TensorRT Python backend#16213

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[TRTLLM-14022][feat] BREAKING: DON'T REVIEW Remove legacy TensorRT Python backend#16213
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@Wanli-Jiang Wanli-Jiang commented Jul 10, 2026 •
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Duplicated PR #15918 to enable post-merge CI tests.

Summary by CodeRabbit

  • Refactor
    • Simplified the package to focus on PyTorch and AutoDeploy workflows.
    • Removed TensorRT-specific backend options, CLI commands, and several legacy exports.
    • Updated benchmark, serve, and eval defaults to align with the PyTorch configuration.
    • Streamlined model and layer availability across the public API.

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  • PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

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@Wanli-Jiang
[TRTLLM-14022][feat] BREAKING: Remove legacy TensorRT Python backend
a7e54c5 
Remove the TensorRT execution backend from the Python package so that
`import tensorrt_llm` and the PyTorch backend run without the `tensorrt`
package installed. The `tensorrt` pip dependency itself is dropped in the
follow-up C++/packaging step; `requirements.txt` is unchanged here.

- Delete the TensorRT graph/build/runtime machinery: builder, network,
  functional graph ops, layers/, plugin/, the legacy models/ implementations,
  the runtime/ session and ModelRunner* classes, _tensorrt_engine, TRT quant
  layers and tools, and the trtllm-build/refit/prune CLIs.
- Keep import paths stable: partly-TensorRT modules (functional.py,
  models/modeling_utils.py, _common.py, runtime/, bench/build) are gutted in
  place so the TensorRT-free symbols used by the PyTorch backend stay put;
  no `_torch/` import churn.
- Drop the TensorRT public API surface (Builder/BuildConfig/TrtLlmArgs/...);
  `LLM(backend="tensorrt")` now raises and `trtllm-serve --backend` accepts
  pytorch/_autodeploy only (api_stability serve-CLI reference updated).
- Remove or de-TRT the tests that exercised the deleted code (disaggregated
  trt-backend tests, TRT bench/openai e2e params, mixed llmapi unittest
  suites) and delist them from test-db/qa/waives; shared test harnesses keep
  their signatures for the PyTorch twins.
- Port test_gather_generation_logits_cuda_graph to the PyTorch accuracy
  suite; repoint examples/apps to the PyTorch LLM; regenerate
  ruff-legacy-baseline.json.

Signed-off-by: Wanli Jiang <35160485+Wanli-Jiang@users.noreply.github.com>
@Wanli-Jiang Wanli-Jiang added the api-breaking Accepted LLM API contract change that is backwards-incompatible label Jul 10, 2026
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Wanli-Jiang commented Jul 10, 2026

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/bot help

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/bot [-h] ['run', 'kill', 'skip', 'reuse-pipeline'] ...

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run [--reuse-test (optional)pipeline-id --disable-fail-fast --skip-test --stage-list "A10-PyTorch-1, xxx" --gpu-type "A30, H100_PCIe" --test-backend "pytorch, cpp" --add-multi-gpu-test --only-multi-gpu-test --disable-multi-gpu-test --post-merge --extra-stage "H100_PCIe-TensorRT-Post-Merge-1, xxx" --detailed-log --debug(experimental) --high-priority]

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--skip-test (OPTIONAL) : Skip all test stages, but still run build stages, package stages and sanity check stages. Note: Does NOT update GitHub check status.

--stage-list "A10-PyTorch-1, xxx" (OPTIONAL) : Only run the specified test stages. Supports wildcard * for pattern matching (e.g., "*PerfSanity*" matches all stages containing PerfSanity). Examples: "A10-PyTorch-1, xxx", "PerfSanity". Note: Does NOT update GitHub check status.

--gpu-type "A30, H100_PCIe" (OPTIONAL) : Only run the test stages on the specified GPU types. Examples: "A30, H100_PCIe". Note: Does NOT update GitHub check status.

--test-backend "pytorch, cpp" (OPTIONAL) : Skip test stages which don't match the specified backends. Only support [pytorch, cpp, tensorrt, triton]. Examples: "pytorch, cpp" (does not run test stages with tensorrt or triton backend). Note: Does NOT update GitHub pipeline status.

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--disable-multi-gpu-test (OPTIONAL) : Disable the multi-GPU tests. Note: Does NOT update GitHub check status.

--add-multi-gpu-test (OPTIONAL) : Force run the multi-GPU tests in addition to running L0 pre-merge pipeline.

--post-merge (OPTIONAL) : Run the L0 post-merge pipeline instead of the ordinary L0 pre-merge pipeline.

--extra-stage "H100_PCIe-TensorRT-Post-Merge-1, xxx" (OPTIONAL) : Run the ordinary L0 pre-merge pipeline and specified test stages. Supports wildcard * for pattern matching. Examples: --extra-stage "H100_PCIe-TensorRT-Post-Merge-1, xxx", --extra-stage "Post-Merge".

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kill

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Wanli-Jiang commented Jul 10, 2026

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/bot run --post-merge --disable-fail-fast

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tensorrt-cicd commented Jul 10, 2026

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PR_Github #58575 [ run ] triggered by Bot. Commit: a7e54c5 Link to invocation

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