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[Accuracy diff No.109] Fix batch_norm mapping - #402
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zrr1999
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由于 pytorch 的batch_norm API 没有 use_global_stats 或 track_running_stats 参数（pytorch在class层面实现的），所以使用 training if use_global_stats is None else not use_global_stats 来替代 training 可以保证pytorch行为 与 paddle行为一致。
修改后 pytorch 行为如下
1
training = False
track_running_stats =True
使用全局
2
training = False
track_running_stats = False
不使用全局
3
training = True
track_running_stats = True
使用全局
4
training = True
track_running_stats = False
不使用全局