import tensorflow as tf

        # input tensors
        self.input_x = tf.placeholder(tf.int32, [None, sequence_max_length], name="input_x")
        self.input_tags = tf.placeholder(tf.int32, [None, sequence_max_length], name="input_tags")
        self.input_deps = tf.placeholder(tf.int32, [None, sequence_max_length], name="input_dependency")
        self.input_head = tf.placeholder(tf.int32, [None, sequence_max_length], name="input_head")
        self.input_y = tf.placeholder(tf.float32, [None, num_classes], name="input_y")
