Created by: wozna

This PR converts one variable to float64 before divide operation. Thanks that we have better scale precision.

There are some results on full dataset on Shanghai machine.

VGG19 BEFORE INT8: avg top1 accuracy: 0.7209, avg top5 accuracy: 0.9011 AFTER INT8: avg top1 accuracy: 0.7212, avg top5 accuracy: 0.9015

RESNET101 BEFORE INT8: avg top1 accuracy: 0.7759, avg top5 accuracy: 0.9354 AFTER INT8: avg top1 accuracy: 0.7764, avg top5 accuracy: 0.9358