NVIDIA-NeMo / NVIDIA-NeMo/Automodel

rope_fusion broken with cp for MoEs

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#1,439 3 comments 0 reactions 1 assignee View on GitHub

@HuiyingLi is already working on this.

Since Aug 27, 2026.

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Description

Enabling rope_fusion with cp > 1 gives incorrect loss for Qwen3 MoE 30b for long context training. Workaround for now is to disable rope_fusion for cp > 1, need to investigate root cause for proper fix.

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