Randomly connect one input to all hidden and output nodes
        (FS-NEAT with connections to hidden, if any).

def connect_fs_neat_hidden(self, config):
        """
        Randomly connect one input to all hidden and output nodes
        (FS-NEAT with connections to hidden, if any).
        """
        input_id = choice(config.input_keys)
        others = [i for i in iterkeys(self.nodes) if i not in config.input_keys]
        for output_id in others:
            connection = self.create_connection(config, input_id, output_id)
            self.connections[connection.key] = connection