def _reference_callables(callable_mode_nodes):
    """For each given node, send callable reference through edges, if any."""

    for node in callable_mode_nodes:

        try:
            children = node.callable_output_socket.children
        except AttributeError:
            pass
        else:

            callable_reference = node.main_callable

            for child in children:
                child.receive_input(callable_reference)
For each given node, send callable reference through edges, if any.
nodezator/graphman/execution.py