tf-transfer-learning & fine tuning

1. tf.estimator + keras.application

• load pretrained weights from imagenet trained vgg19
• vgg19.py
• summary output

2. tf.estimator + tensorflow hub

• note: tensorflow >= 1.7
• load pretrained weights from imagenet trained inception_v3 && resnet_v2_101
• inception_v3.py && resnet_v2_101.py

Tensoboard outputs