run error in train.py

[nicole-chen]

• In utils.py
  from tensorflow.python.ops.rnn_cell_impl import _Linear
  Error: no module named _Linear
  maybe from rnn_cell_impl import _Linear？
  from keras import backend as K
  keras is never called here

• In rnn.py
  _like_rnncell = rnn_cell_impl._like_rnncell
  AttributeError: 'module' object has no attribute '_like_rnncell'
  one has to add import rnn_cell_impl at the beginning of rnn.py

• In rnn_cell_impl.py
  if context.in_graph_mode():
  if your tensorflow is >= 1.12.0 it may raise error:
  AttributeError: 'module' object has no attribute 'in_graph_mode'

#if context.in_graph_mode():
if not context.executing_eagerly():

would work