Merge pull request Rayhane-mamah#154 from Yeongtae/master

Fix assert_like_rnncell not found error using version check

tacotron/models/custom_decoder.py

@@ -10,7 +10,7 @@
 from tensorflow.python.layers import base as layers_base
 from tensorflow.python.ops import rnn_cell_impl
 from tensorflow.python.util import nest
-
+from pkg_resources import parse_version
 
 class CustomDecoderOutput(
 		collections.namedtuple("CustomDecoderOutput", ("rnn_output", "token_output", "sample_id"))):
@@ -40,7 +40,11 @@ def __init__(self, cell, helper, initial_state, output_layer=None):
 		Raises:
 			TypeError: if `cell`, `helper` or `output_layer` have an incorrect type.
 		"""
-		rnn_cell_impl.assert_like_rnncell(type(cell), cell)
+		if (parse_version(tf.__version__) >= parse_version('1.10')):
+			rnn_cell_impl.assert_like_rnncell(type(cell), cell)
+		else:
+			if not rnn_cell_impl._like_rnncell(cell):  # pylint: disable=protected-access
+				raise TypeError("cell must be an RNNCell, received: %s" % type(cell))
 		if not isinstance(helper, helper_py.Helper):
 			raise TypeError("helper must be a Helper, received: %s" % type(helper))
 		if (output_layer is not None