FIX zero loss in validation set by setting bidirectional_rnn = False
FIX zero loss in validation set by setting bidirectional_rnn = False

Because for current architecture, bidirectional RNN can cheat by looking ahead.

Bidirectional RNN can be used if in seq2seq architecture input and output of
RNN are not 1-to-1 correspondent.

danieljl/keras-image-captioning,danieljl/keras-image-captioning