The `add_node` function in the `MultiDiGraph` class of the Python `networkx` library is used to add a node to the directed multigraph. A multigraph is a graph that can have multiple edges connecting the same pair of nodes, and a directed multigraph is a multigraph with directed edges.
The `add_node` function takes the node as the only argument and adds it to the graph. If the node already exists in the graph, this function simply does nothing. Nodes can be any hashable object, such as integers, strings, or even user-defined objects.
This function is useful when building a directed multigraph, as it allows for the incremental addition of nodes to the graph.
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