def build_model(self):
        """Build the model's computational graph."""
        with tf.variable_scope(
                "model", reuse=None, initializer=self.initializer):
            self._create_placeholders()
            self._create_rnn_cells()
            self._create_initstate_and_embeddings()
            self._create_rnn_architecture()
            self._create_optimizer_node()
Build the model's computational graph.