https://github.com/honghuCode/mobileFacenet-ncnn/tree/feature/mobilefacenet-mxnet2caffe
2.将BN层和卷积层合并(提高速度)参考: https://github.com/chuanqi305/MobileNet-SSD/blob/master/merge_bn.py
https://github.com/honghuCode/mobileFacenet-ncnn/tree/update-mobilefacenet-ncnn
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