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import torch.fx as fx

def set_trace(gm: fx.GraphModule) -> fx.GraphModule:
    """

    Sets a breakpoint in `gm`'s generated python code. It drops into pdb when

    `gm` gets run.



    Args:

        gm: graph module to insert breakpoint. It is then recompiled for it to

            take effect.



    Returns:

        the `gm` with breakpoint inserted.

    """
    def insert_pdb(body):
        return ["import pdb; pdb.set_trace()\n", *body]

    with gm.graph.on_generate_code(
        make_transformer=lambda cur_transform: (
            # new code transformer to register
            lambda body: (
                insert_pdb(
                    cur_transform(body) if cur_transform
                    else body
                )
            )
        )
    ):
        gm.recompile()

    return gm