fix the bug where convert bn to sync_bn in the model for evaluation during the training phase will change the training model graph #300
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…uring the training phase will change the training model graph
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The origin implementation converts bn to sync_bn in the model for evaluation during the multi-gpu training phase, which is not necessarily and changes the training model graph, causes the gradient of multi-gpu cannot be gathered during later training backward:
so we remove the convertion.