ONNX 导出失败的根因是图里某处会把一个标量常量以没有 dtype（即 None） 的形式传给了 ONNX 导出器，导致 torch.onnx。_type_utils.JitScalarType.from_name 收到 None 并抛出 ValueError: Scalar type name cannot be None。这类情况常在用高级索引/原地赋值（tensor[index] = other、index_put、masked_scatter 等）时出现，导出器有时会把标量常量漏掉 dtype。
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