Remove the layer, and reconnect each of its predecessor to each of
        its successor

def _remove_layer_and_reconnect(self, layer):
        """ Remove the layer, and reconnect each of its predecessor to each of
        its successor
        """
        successors = self.get_successors(layer)
        predecessors = self.get_predecessors(layer)
        # remove layer's edges
        for succ in successors:
            self._remove_edge(layer, succ)
        for pred in predecessors:
            self._remove_edge(pred, layer)

        # connect predecessors and successors
        for pred in predecessors:
            for succ in successors:
                self._add_edge(pred, succ)

        # remove layer in the data structures
        self.layer_list.remove(layer)
        self.keras_layer_map.pop(layer)

        # re-assign input and output layers if layer happens to be an
        # input / output layer
        if layer in self.input_layers:
            idx = self.input_layers.index(layer)
            self.input_layers.pop(idx)
            for pred in predecessors:
                self.input_layers.insert(idx, pred)
                idx += 1
        if layer in self.output_layers:
            idx = self.output_layers.index(layer)
            self.output_layers.pop(idx)
            for succ in successors:
                self.output_layers.insert(idx, succ)
                idx += 1