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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _create_rnn_cells(self):
 """Create the LSTM cells."""

        lstm_cell = tf.nn.rnn_cell.LSTMCell(
            self.num_hidden, forget_bias=0.0)
        lstm_cell = tf.nn.rnn_cell.DropoutWrapper(
            lstm_cell, output_keep_prob=self.dropout)
        self.cell = tf.nn.rnn_cell.MultiRNNCell(
            [lstm_cell] * self.num_layers)