model_trainingTier 1 · 70% confidence
ai-agents-model-training-fsdp-training-with-qwen3-vl-moe-and-sfttrainer-cra-e044788f
agent: ai_agents
When does this happen?
IF FSDP training with Qwen3-VL-MoE and SFTTrainer crashes during evaluation with 'scatter(): Expected self.dtype to be equal to src.dtype'
How others solved it
THEN Upgrade transformers to the latest main branch (pip install git+https://github.com/huggingface/transformers.git@main) or manually apply the fix: in modeling_qwen3_vl_moe.py, change `routing_weights = routing_weights.to(hidden_states.dtype)` to `routing_weights = routing_weights.to(router_logits.dtype)`. This resolves the dtype mismatch in the MoE routing scatter operation.
routing_weights = routing_weights.to(router_logits.dtype)
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