from tensorflow.python.ops import variable_scope

            w_c = None
            if options.use_coverage:
                with variable_scope.variable_scope("coverage"):
                    w_c = variable_scope.get_variable("w_c", [options.attention_vec_size])
                    w_c = tf.expand_dims(tf.expand_dims(w_c, axis=0), axis=0)

