improve amp training #10119
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improve amp training #10119
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背景：ch_PP-OCRv2_det 模型在amp fp16训练中，O1、O2都会出现nan，原因是模型中卷积层的数值范围极大，超出了fp16的表示范围，并不适合这种训练方式。我们尝试了amp bf16 训练，发现无需任何额外配置，模型未出现nan，精度和相同配置下的fp32训练可以对齐。
PR：为套件添加amp_dtype的选项，默认为float16，给ch_PP-OCRv2_det 模型配置为bfloat16