Beam search decoder generalization
Beam search decoder generalization

beam search decoder can now work with any decoder that has decoder feedables
composed of either tensors or list of tensors. All of them with the first
dimension being the beam.

ufal/neuralmonkey,ufal/neuralmonkey,juliakreutzer/bandit-neuralmonkey,ufal/neuralmonkey,ufal/neuralmonkey,juliakreutzer/bandit-neuralmonkey,juliakreutzer/bandit-neuralmonkey,juliakreutzer/bandit-neuralmonkey,juliakreutzer/bandit-neuralmonkey,ufal/neuralmonkey