module 'tensorflow.contrib.rnn' has no attribute 'core_rnn_cell'
#tf.contrib.rnn.core_rnn_cell.BasicLSTMCell(lstm_size)
tf.contrib.rnn.BasicLSTMCell(lstm_size)
#tf.contrib.rnn.core_rnn_cell.BasicLSTMCell(lstm_size)
tf.contrib.rnn.BasicLSTMCell(lstm_size)