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[None][fix] DeepSeek-V3.2 encoder: restore the blank lines of the tools preamble - #21055
tensorrt_llm/tokenizer/deepseek_v32/encoding.py is a copy of DeepSeek-V3.2's own prompt encoder (encoding/encoding_dsv32.py in the checkpoint). It says so in its header. The copy dropped the seven empty lines inside TOOLS_SYSTEM_TEMPLATE, the preamble rendered for every request with tools:
after ## Tools;
after each example </｜DSML｜function_calls>;
after the "String and scalar..." and "If the thinking_mode..." lines;
after </function_results>;
after the thinking line.
So every request with tools served with --custom_tokenizer deepseek_v32 rendered a preamble the checkpoint was not trained on. Its token ids differ from the checkpoint's from the ninth token on. Prompts without tools are unaffected.
Upstream has only one revision of the encoder, and it has those lines. This is a copying slip, not a second version of the format. DeepSeek-V3.2-Exp uses its own chat template and does not use this encoder. The affected models are the ones served with this encoder:
deepseek-ai/DeepSeek-V3.2;
deepseek-ai/DeepSeek-V3.2-Speciale;
nvidia/DeepSeek-V3.2-NVFP4.
The template is now copied verbatim. Nothing else changes.
Test Coverage
tests/unittest/llmapi/test_deepseek_v32_encoding.py (new, CPU, added to l0_cpu.yml):
test_tools_preamble_keeps_its_blank_lines needs no checkpoint.
test_matches_the_checkpoint_golden_prompts runs the checkpoint's own encoder test for all three golden prompts: tools on the first message, thinking mode. It needs the checkpoint's encoding/ directory under LLM_MODELS_ROOT (DeepSeek-V3.2-hf) and is skipped without it.
Without this change, all three golden prompts differ from the encoder's output, only at those lines.
With it, all three are equal.
PR Checklist
PR description clearly explains what and why.
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TOOLS_SYSTEM_TEMPLATE restores the missing blank lines in the DeepSeek-V3.2 tools preamble. This changes rendered tool-enabled prompts without changing the encoder API. The change is limited to the template, its CPU tests, and the CPU test list. Test execution results were not supplied.
QA Engineer Review
The change adds tests/unittest/llmapi/test_deepseek_v32_encoding.py and lists it in tests/integration/test_lists/test-db/l0_cpu.yml. test_tools_preamble_keeps_its_blank_lines checks the rendered preamble. The parameterized test_matches_the_checkpoint_golden_prompts compares three prompts with checkpoint golden files and skips when the checkpoint inputs are unavailable. Coverage: sufficient for verifying the template correction. Execution is unverified.
Per-File QA Perspective
tensorrt_llm/tokenizer/deepseek_v32/encoding.py: Verify that tool-enabled prompts contain the restored blank lines. The change affects template whitespace.
tests/unittest/llmapi/test_deepseek_v32_encoding.py: Covers preamble whitespace and three checkpoint golden prompts. The module is listed in the CPU CI list. No manual-QA list entry was found.
tests/integration/test_lists/test-db/l0_cpu.yml: Adds the encoder test module to the CPU CI list.
…ls preamble
The vendored copy of DeepSeek-V3.2's prompt encoder dropped the seven empty
lines of TOOLS_SYSTEM_TEMPLATE that the checkpoint's own encoding_dsv32.py
has, so every request with tools rendered a preamble the checkpoint was not
trained on. The template is now copied verbatim, and a CPU test compares
the encoder with the checkpoint's three golden prompts when the checkpoint's
encoding/ directory is available.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
Reviewing files that changed from the base of the PR and between d14b1a7 and ed882ac.
Files selected for processing: 1
tests/integration/test_lists/test-db/l0_cpu.yml
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Walkthrough
The DeepSeek-V3.2 tools preamble now includes additional blank lines. New CPU tests check the rendered preamble and compare encoded prompts with checkpoint golden files.
CPU tests check the tools preamble whitespace and compare encoded prompts with three checkpoint golden files. The CPU test list includes the new test module.
NVIDIA/TensorRT-LLM#21051: Changes DeepSeek V3.2 tool placement in apply_chat_template, which also affects rendered tool-enabled prompts.
Merge Risk: Low · up to ed882
The prompt whitespace change is preserved through rendering and covered by registered tests, but the modified source file still needs the required NVIDIA header or an approved exception.
Pre-merge checks: 5
Check name
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Explanation
Title check
The title follows the required format and clearly identifies the fix: restoring blank lines in the DeepSeek-V3.2 tools preamble.
Description check
The description explains the issue, affected models, implementation, and test coverage. It includes the required Description and Test Coverage sections. The checklist is only partially completed, but …
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within survi…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Description check
Explanation
The description explains the issue, affected models, implementation, and test coverage. It includes the required Description and Test Coverage sections. The checklist is only partially completed, but the missing confirmations are non-critical for this check.
Full details: Docstring Coverage
Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 2 files. (1 skipped: 1 unsupported.)
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Add the NVIDIA copyright header to the modified encoder.
The file starts with a copy-from comment and has no NVIDIA copyright year to update for this change. Add the repository header with the modification year. As per coding guidelines, “NVIDIA copyright header on ALL new files (update year on modified files).” (raw.githubusercontent.com)
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Review comment at @tensorrt_llm/tokenizer/deepseek_v32/encoding.py at line 1:
Add the standard NVIDIA copyright header with the current modification year at
the start of the encoder, before the existing copy-from comment.
Source: Coding guidelines
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @tensorrt_llm/tokenizer/deepseek_v32/encoding.py:
- Line 21: Update test_tools_preamble_keeps_its_blank_lines to assert the
complete tools preamble through the functions section, including all seven
blank-line separators, so removing any separator fails the test.
---
Outside diff comments:
Review comments at @tensorrt_llm/tokenizer/deepseek_v32/encoding.py:
- Line 1: Add the standard NVIDIA copyright header with the current modification
year at the start of the encoder, before the existing copy-from comment.
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…ls preamble
The CPU test now counts the seven blank lines between the tools heading and
the function list, so losing any of them fails it, not only the first.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
@coderabbitai On the outside-diff comment in review 5661097181 (NVIDIA header on deepseek_v32/encoding.py): not taken. The file is a verbatim copy of the encoder that ships with the DeepSeek-V3.2 checkpoint, as its first line says, and main carries it without an NVIDIA header. This PR only restores the blank lines the copy had lost, and it should stay a faithful copy of third-party code rather than gain an NVIDIA copyright notice.
#!/bin/bash
sed -n '181,380p' AGENTS.md
if [ -f CLAUDE.local.md ];then cat CLAUDE.local.md;fi
Length of output: 3513
@JunyiXu-nv I couldn't produce a complete response to this request. Please try again.
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Learnt from: yibinl-nvidia
Repo: NVIDIA/TensorRT-LLM PR: 14161
File: tensorrt_llm/serve/cluster_storage.py:5-5
Timestamp: 2026-05-16T01:43:05.118Z
Learning: In the TensorRT-LLM repository (NVIDIA/TensorRT-LLM), do not flag missing NVIDIA Apache 2.0 license headers in Python source files. License headers are not required or enforced in this codebase.
…ts literal text
The CPU test compares the rendered preamble with the text the checkpoint's
encoder writes, so a blank line moved within it fails the test too, not only
one removed.
Signed-off-by: JunyiXu-nv <219237550+JunyiXu-nv@users.noreply.github.com>
Automatically added "ci: full pre-merge approved" because this PR has satisfied the required GitHub review approvals. Unresolved review conversations and other required checks remain independent merge requirements.
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Description
tensorrt_llm/tokenizer/deepseek_v32/encoding.pyis a copy of DeepSeek-V3.2's own prompt encoder (encoding/encoding_dsv32.pyin the checkpoint). It says so in its header. The copy dropped the seven empty lines insideTOOLS_SYSTEM_TEMPLATE, the preamble rendered for every request with tools:## Tools;</｜DSML｜function_calls>;</function_results>;So every request with tools served with
--custom_tokenizer deepseek_v32rendered a preamble the checkpoint was not trained on. Its token ids differ from the checkpoint's from the ninth token on. Prompts without tools are unaffected.Upstream has only one revision of the encoder, and it has those lines. This is a copying slip, not a second version of the format. DeepSeek-V3.2-Exp uses its own chat template and does not use this encoder. The affected models are the ones served with this encoder:
deepseek-ai/DeepSeek-V3.2;deepseek-ai/DeepSeek-V3.2-Speciale;nvidia/DeepSeek-V3.2-NVFP4.The template is now copied verbatim. Nothing else changes.
Test Coverage
tests/unittest/llmapi/test_deepseek_v32_encoding.py(new, CPU, added tol0_cpu.yml):test_tools_preamble_keeps_its_blank_linesneeds no checkpoint.test_matches_the_checkpoint_golden_promptsruns the checkpoint's own encoder test for all three golden prompts: tools on the first message, thinking mode. It needs the checkpoint'sencoding/directory underLLM_MODELS_ROOT(DeepSeek-V3.2-hf) and is skipped without it.PR Checklist
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/bot help.🤖 Generated with Claude Code
Dev Engineer Review
TOOLS_SYSTEM_TEMPLATErestores the missing blank lines in the DeepSeek-V3.2 tools preamble. This changes rendered tool-enabled prompts without changing the encoder API. The change is limited to the template, its CPU tests, and the CPU test list. Test execution results were not supplied.QA Engineer Review
The change adds
tests/unittest/llmapi/test_deepseek_v32_encoding.pyand lists it intests/integration/test_lists/test-db/l0_cpu.yml.test_tools_preamble_keeps_its_blank_lineschecks the rendered preamble. The parameterizedtest_matches_the_checkpoint_golden_promptscompares three prompts with checkpoint golden files and skips when the checkpoint inputs are unavailable. Coverage: sufficient for verifying the template correction. Execution is unverified.Per-File QA Perspective
tensorrt_llm/tokenizer/deepseek_v32/encoding.py: Verify that tool-enabled prompts contain the restored blank lines. The change affects template whitespace.tests/unittest/llmapi/test_deepseek_v32_encoding.py: Covers preamble whitespace and three checkpoint golden prompts. The module is listed in the CPU CI list. No manual-QA list entry was found.tests/integration/test_lists/test-db/l0_cpu.yml: Adds the encoder test module to the CPU CI list.