[dygraph] Polish the timing method and log of some dygraph models. #4699
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修改resnet、mobilenet、seq2seq、ptb、transformer共5个模型的计时方式,使得每个模型会有一下计时信息输出:
这种计时方式得到的batch_cost和epoch_cost结论才是一致的。计时插入模式如下:
另外,seq2seq中所有源码文件都有x权限,所以修改了文件的权限,并用pre-commit调了下格式。
说明和TODO: