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fix BatchNorm for fp16 #36376

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Oct 13, 2021
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fix BatchNorm for fp16 #36376

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c36eb75
fix BatchNorm for fp16
GuoxiaWang Oct 12, 2021
846a539
fix
GuoxiaWang Oct 12, 2021
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5 changes: 4 additions & 1 deletion python/paddle/nn/layer/norm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -563,7 +563,10 @@ def __init__(self,
self._bias_attr = bias_attr
self._use_global_stats = use_global_stats

self._dtype = 'float32'
if get_default_dtype() == 'float16':
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这样的话default type是fp16的话，不是还是强制改成了fp32嘛？

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@GuoxiaWang GuoxiaWang Oct 13, 2021 •
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是必须强制改成fp32，因为精度问题，batchnorm 是明确要求参数不能是fp16的，一般fp16输入都是用fp32的来表达参数，输入可以是fp16，区别在于 set_default_dtype，这个会改变全局的 dtype，而这个位置应该只是改变当前层的 dtype，所以应该只改变局部dtype，而不是全局 dtype

self._dtype = 'float32'
else:
self._dtype = get_default_dtype()

param_shape = [num_features]

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