Merge branch 'tf2' into 'master'

.pre-commit-config.yaml

bob/__init__.py

bob/learn/__init__.py

bob/learn/tensorflow/__init__.py

bob/learn/tensorflow/callbacks.py

...tensorflow/configs/style_transfer/inception_v1_example.py

...tensorflow/configs/style_transfer/inception_v2_example.py

bob/learn/tensorflow/configs/style_transfer/vgg19_example.py

...rn/tensorflow/configs/style_transfer/vincent_van_gogh.jpg

...n/tensorflow/configs/style_transfer/vincent_van_gogh2.jpg

bob/learn/tensorflow/data/__init__.py

bob/learn/tensorflow/data/generator.py

bob/learn/tensorflow/data/tfrecords.py

bob/learn/tensorflow/dataset/__init__.py

bob/learn/tensorflow/dataset/bio.py

bob/learn/tensorflow/dataset/image.py

bob/learn/tensorflow/dataset/siamese_image.py

bob/learn/tensorflow/dataset/tfrecords.py

bob/learn/tensorflow/dataset/triplet_image.py

bob/learn/tensorflow/estimators/EPSC.py