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[Bugfix][Tool Parser] Parse multi-line JSON arguments in the DeepSeek V3 and V3.1 parsers - #60362
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…tool parsers Signed-off-by: niansia <niansia930202@gmail.com>
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Reproduced and verified: with real DeepSeek-V3/V3.1 tokenizers and two parallel calls (string-, number-, nested-ending args, indent 2 and 4), main loses or truncates every pretty-printed call in both modes for both parsers, and this PR gets all of them right. I'd prefer this over #60361 because the V3.1 parser has the same bug (#60361 only fixes V3). Related, not introduced here: with multi-token deltas (MTP / |
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/ci run |
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✅ @niansia, CI is now available for this PR.
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✅ Triggered Buildkite CI #95901 for commit |
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This pull request has merge conflicts that must be resolved before it can be |
Signed-off-by: Artem Perevedentsev <aperevedents@nvidia.com> # Conflicts: # tests/tool_parsers/test_deepseekv3_tool_parser.py
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/ci run |
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✅ Triggered Buildkite CI #95907 for commit |
… V3 and V3.1 parsers (vllm-project#60362) Signed-off-by: niansia <niansia930202@gmail.com> Co-authored-by: Artem Perevedentsev <aperevedents@nvidia.com>
Overview
Fixes #60342. The
deepseek_v3anddeepseek_v31tool parsers lose tool calls whose JSON arguments the model pretty-prints over several lines: their regexes match the arguments with., which stops at a newline.Claims
deepseek_v3anddeepseek_v31, in both streaming and non-streaming mode.Validation
Reproducer from the issue, run through the test helpers with the real tokenizers (
deepseek-ai/DeepSeek-V3,deepseek-ai/DeepSeek-V3.1), with{"city": "Tokyo", "unit": "celsius"}dumped withindent=2:deepseek_v3tools_called=True,tool_calls=[])get_weatherwith the full argumentsdeepseek_v3get_weatherwith arguments{get_weatherwith the full argumentsdeepseek_v31get_weatherwith the full argumentsdeepseek_v31get_weatherwith arguments{get_weatherwith the full argumentsAdded
test_multiline_json_arguments(DeepSeek-V3, two parallel calls with pretty-printed arguments) andtest_extract_tool_calls_with_multiline_arguments(DeepSeek-V3.1), each run in streaming and non-streaming mode. All four cases fail on main and pass with this change.ruff check,ruff format --checkandtools/pre_commit/mypy.pypass on the changed files.These ran on CPU (WSL,
VLLM_TARGET_DEVICE=empty, with the post-test GPU cleanup skipped since there is no accelerator). I did not run a server end to end with a DeepSeek-V3 checkpoint, which needs a multi-GPU node; the change is limited to the parsers' regexes.Details
DeepSeekV3ToolParsermatchesfunction_argumentswith.*(.*[^\n`]when streaming), andDeepSeekV31ToolParserwith.*?/.*. Withoutre.DOTALL,.doesn't match\n, so the non-streaming regex finds nothing and the streaming regex captures only the first line of the arguments.[\s\S]. It stays non-greedy in the regexes used withfindall, so parallel calls still split at the first closing tag. The type and function-name groups keep., so a name can't span lines and the whole pattern doesn't needre.DOTALL.rust/src/parser/src/tool/deepseek_json) don't use a regex here;take_json_objectscans the object by brace depth, so from reading the code they already handle pretty-printed arguments. Only the Python parsers change.AI assistance was used for this change (tracking down the cause, writing the tests and this description). I reviewed every changed line and ran the tests above.
Pull Request Checklist
I used vLLM's
/pr-checklistskill. (Mandatory for agents, optional for humans).AI assistance was used during the creation of this PR.
Design Fit: Minimizes impact on core components, reuses existing functionality, and justifies added complexity.
Testing and Validation: Validates the change and ensures any added tests are meaningful and reliable, with CI coverage or documented CI resource constraints and validation performed outside CI.
Code Quality and Style: Keeps code and comments clear and concise, and updates relevant documentation and examples.
Pull Request Contents: Includes a brief summary and relevant links, supports claims with evidence, explains root causes and implementation trade-offs, and follows the contributing guide.