Why it matters

Megatron is frontier training foundation. Understanding shapes tooling.

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The architecture

Tensor + pipeline + data + sequence + expert parallelism.

Highly-optimized kernels.

Reference training scripts.

Megatron-LM stackMulti-axis parallelismTP + PP + DP + SP + EPOptimized kernelsflash + fusedReference scriptstraining + evalNVIDIA NeMo + Megatron-Core productize; frontier LLMs use variants
Megatron-LM.
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How it works end to end

NeMo builds on Megatron-Core.

Flash Attention + fused kernels.

MoE + long context supported.