Fix MaskCNN/Pool

Fix the default behavior of MaskCNN, MaskPool

CuDNNRNN

1. fix 1.2.2 bugs
2. bypass the mask if return_sequences

CuDNNRNN

1. Let add_spectral_norm supports CuDNNGRU and CuDNNLSTM
2. fix the mistakes that CuDNNGRU and CuDNNLSTM fed mask from Sequential

Mask Max Pooling

add MaskMaxPool1D and MaskGlobalMaxPool1D to masking module

Masking Layer Module

Major Features and Improvements

• Add layers supporting masking: MaskConv1D, MaskAveragePooling1D, ApplyMask

Breaking Changes:

• Rename GlobalAveragePooling1D support masking -> MaskGlobalAveragePooling1D,
  move it to talos.layers.masking
  Original GlobalAveragePooling1D don't support masking anymore.

Tensorflow 1.13.1

Breaking Change:

• Upgrade tensorflow to 1.13.1

Fix Spectral Norm Formula

Fix spectral norm formula.
Add tests to make sure its gradient has same result as paper.

Model spectral norm

can apply add_spectral_norm on custom Model subclass

Fix transformer res-add

Fix the res-add of inputs of TransformerBlock and TransformerXL

Bidirectional XL

TransformerXL supports gradient & bidirectional