[alignment-megatron] PR6: SGLang Backend Surface#25
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Add a clean Megatron backend that calls SGLang-compatible math under a flag: - sglang.py: SGLangLinear, SGLangRMSNorm, SGLangFlashAttention and related modules - matmul_tp_inv.py: TP-invariant matmul dispatch for Megatron layers - transformer_config.py: use_sglang config flag - arguments.py: --use-sglang CLI arg - layers.py: conditional SGLang backend selection in TP layers - gpt_layer_specs.py: SGLang-compatible layer spec builder - test_sglang_extension.py: import, config, and default-path-unchanged tests Default training path remains unchanged when use_sglang is off. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
--use-sglangflagChanges
megatron/core/extensions/sglang.py: SGLangLinear, SGLangRMSNorm, SGLangFlashAttention and related modulesmegatron/core/tensor_parallel/matmul_tp_inv.py: TP-invariant matmul dispatchmegatron/core/transformer/transformer_config.py:use_sglangconfig flagmegatron/training/arguments.py:--use-sglangCLI argmegatron/core/tensor_parallel/layers.py: conditional SGLang backend selectionmegatron/core/models/gpt/gpt_layer_specs.py: SGLang-compatible layer spec buildertests/unit_tests/extension/test_sglang_extension.py: unit testsDone when
Test plan
use_sglang🤖 Generated with Claude Code