message: Expose new CRF classes and function.
diff: @@ -21,7 +21,10 @@ See the @{$python/contrib.crf} guide.
  @@crf_log_likelihood
  @@crf_unary_score
  @@crf_binary_score
  +@@crf_decode
  @@CrfForwardRnnCell
  +@@CrfDecodeForwardRnnCell
  +@@CrfDecodeBackwardRnnCell
  @@viterbi_decode
  """
  @@ -31,11 +34,14 @@ from __future__ import print_function
  from tensorflow.contrib.crf.python.ops.crf import _lengths_to_masks
  from tensorflow.contrib.crf.python.ops.crf import crf_binary_score
  +from tensorflow.contrib.crf.python.ops.crf import crf_decode
  from tensorflow.contrib.crf.python.ops.crf import crf_log_likelihood
  from tensorflow.contrib.crf.python.ops.crf import crf_log_norm
  from tensorflow.contrib.crf.python.ops.crf import crf_sequence_score
  from tensorflow.contrib.crf.python.ops.crf import crf_unary_score
  from tensorflow.contrib.crf.python.ops.crf import CrfForwardRnnCell
  +from tensorflow.contrib.crf.python.ops.crf import CrfDecodeForwardRnnCell
  +from tensorflow.contrib.crf.python.ops.crf import CrfDecodeBackwardRnnCell
  from tensorflow.contrib.crf.python.ops.crf import viterbi_decode
  from tensorflow.python.util.all_util import remove_undocumented
  