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tf.contrib.layers.dense_to_sparse

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Converts a dense tensor into a sparse tensor.

An example use would be to convert dense labels to sparse ones so that they can be fed to the ctc_loss.

tensor An int Tensor to be converted to a Sparse.
eos_token An integer. It is part of the target label that signifies the end of a sentence.
outputs_collections Collection to add the outputs.
scope Optional scope for name_scope.