Fine-tuning weights files

Add fine-tuning mode weights for VGG16, VGG16-Places365 and ResNet50.

batch_size = 25
fine_tune_epochs = 20

class_weight = {0: 5.08, 1: 1, 2: 10.86, 3: 5.08, 4: 3.46, 5: 2.31, 6: 4.70, 7: 6.17, 8: 1.55}