Porting to TF2

Fixes #75 (closed)

bob/learn/tensorflow/configs/style_transfer/inception_v1_example.py

-"""
-Example using inception resnet v1
-
-"""
-
-import tensorflow as tf
-
-# -- architecture
-from bob.learn.tensorflow.network import inception_resnet_v1_batch_norm
-architecture = inception_resnet_v1_batch_norm
-
-# --checkpoint-dir
-from bob.extension import rc
-checkpoint_dir = rc['bob.bio.face_ongoing.inception-v1_batchnorm_rgb']
-
-# --style-end-points and -- content-end-points
-style_end_points = ["Conv2d_1a_3x3", "Conv2d_2b_3x3"]
-content_end_points = ["Block8"]
-
-scopes = {"InceptionResnetV1/":"InceptionResnetV1/"}
-
-# --style-image-paths
-style_image_paths = ["vincent_van_gogh.jpg",
-                     "vincent_van_gogh2.jpg"]
-
-# --preprocess-fn
-preprocess_fn = tf.image.per_image_standardization