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[misc] feat: add megatron script for open math reasoning - #3844

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vermouth1992 merged 8 commits into
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vermouth1992:chi/fix/sft_trainer_resume
Oct 21, 2025
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vermouth1992 merged 8 commits into
verl-project:mainfrom
vermouth1992:chi/fix/sft_trainer_resume

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What does this PR do?

  • Add SFT trainer with megatron backend using OpenMathReasoning
  • Fix sft trainer resume global step
  • Fix ipv6 address in vllm/sglang server

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Code Review

This pull request introduces support for training with the Megatron backend for the OpenMathReasoning SFT task, including a new recipe script and documentation. It also includes important bug fixes for resuming SFT training from a checkpoint and for handling IPv6 addresses in the vLLM and SGLang servers. The changes are generally good, but I've pointed out an issue with a hardcoded experiment name in the new shell script which could impact maintainability and reproducibility.

ENGINE_CONFIG="$MEGATRON_ENGINE_CONFIG"
echo "Using megatron engine"
exp_name=nvidia-openmathreasoning-${backend}-tp${TP_SIZE}-pp${PP_SIZE}-vpp${VPP_SIZE}-cp${CP_SIZE}-pad-${PAD_MODE}-use_remove_padding-${USE_REMOVE_PADDING}
exp_name=nvidia-openmathreasoning-${backend}-tp${TP_SIZE}-pp${PP_SIZE}-vpp${VPP_SIZE}-cp${CP_SIZE}-megatron-1018a1

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high

The experiment name for the Megatron backend is now partially hardcoded and omits important configuration parameters like PAD_MODE and USE_REMOVE_PADDING. Since these variables are still used to configure the training run, not including them in exp_name can lead to confusion and potential overwriting of experiment artifacts if their values are changed. It's recommended to use a descriptive experiment name that includes all relevant parameters to ensure reproducibility and avoid conflicts.

Suggested change
exp_name=nvidia-openmathreasoning-${backend}-tp${TP_SIZE}-pp${PP_SIZE}-vpp${VPP_SIZE}-cp${CP_SIZE}-megatron-1018a1
exp_name=nvidia-openmathreasoning-${backend}-tp${TP_SIZE}-pp${PP_SIZE}-vpp${VPP_SIZE}-cp${CP_SIZE}-pad-${PAD_MODE}-use_remove_padding-${USE_REMOVE_PADDING}

@wuxibin89

wuxibin89 commented Oct 21, 2025 •

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Fix ipv6 address in vllm/sglang server

This part is missing?

@vermouth1992

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Fix ipv6 address in vllm/sglang server

This part is missing?

This is fixed in #3679

@vermouth1992
vermouth1992 merged commit 981d781 into verl-project:main Oct 21, 2025
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@vermouth1992
vermouth1992 deleted the chi/fix/sft_trainer_resume branch October 21, 2025 11:33
wangboxiong320 pushed a commit to wangboxiong320/verl that referenced this pull request Nov 1, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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NenoL2001 pushed a commit to NenoL2001/verl that referenced this pull request Nov 3, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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chenjiaoAngel added a commit to chenjiaoAngel/verl that referenced this pull request Nov 14, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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chenhaiq pushed a commit to The-Hierophant/verl-1 that referenced this pull request Nov 18, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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NenoL2001 pushed a commit to NenoL2001/verl that referenced this pull request Nov 26, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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TimurTaepov pushed a commit to giorgossideris/verl that referenced this pull request Dec 20, 2025
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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vyomakesh0728 added a commit to vyomakesh0728/verl that referenced this pull request Jan 22, 2026
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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zwluestc pushed a commit to zwluestc/verl that referenced this pull request May 12, 2026
…t#3844)

### What does this PR do?

- Add SFT trainer with megatron backend using OpenMathReasoning
- Fix sft trainer resume global step
- Fix ipv6 address in vllm/sglang server

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