import tensorflow as tf

                                            initializer=tf.constant_initializer(self.dale_out),
                                            trainable=False)

            # Connectivity weight matrices:
            self.input_Connectivity = tf.get_variable('input_Connectivity', [N_rec, N_in],
                                                    initializer=tf.constant_initializer(
                                                        self.input_connectivity_mask),
                                                    trainable=False)
            self.rec_Connectivity = tf.get_variable('rec_Connectivity', [N_rec, N_rec],
                                                    initializer=tf.constant_initializer(
                                                        self.recurrent_connectivity_mask),
                                                    trainable=False)
            self.output_Connectivity = tf.get_variable('output_Connectivity', [N_out, N_rec],
                                                    initializer=tf.constant_initializer(
                                                        self.output_connectivity_mask),
                                                    trainable=False)

            # ------------------------------------------------
