class_docstr: Tests mle losses.
      
docstr: Tests `sequence_sparse_softmax_cross_entropy`
          
code: def test_sequence_sparse_softmax_cross_entropy(self):
      """Tests `sequence_sparse_softmax_cross_entropy`"""
      self._test_sequence_loss(
          tx.losses.sequence_sparse_softmax_cross_entropy,
          self._labels,
          self._logits,
          self._sequence_length,
      )
  
file_path: texar/tests/losses/mle_losses_test.py
imports: import numpy
  import tensorflow
  import texar.tf
label_desc: Use image node_id 4 for calling the MLELossesTest obj's underlying member method code with example usage: obj.test_sequence_sparse_softmax_cross_entropy() without return types