Gumbel softmax trick with beam search

Is it possible to use Gumbel softmax trick with a beam search decoder in the existing implementation of Texar. I want to differentiate through the generated beam search samples into the generator network.

Start by locating Texar's existing beam search decoder and generator interfaces, then review how generated samples are represented during decoding. Determine whether Gumbel-softmax gradients can pass through beam-search samples; done requires a defined implementation path and validation of differentiation into the generator network.

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