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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def sia_bipartitions(nodes, node_labels=None):
 """Return all |big_phi| cuts for the given nodes. This value changes based on :const:`config.CUT_ONE_APPROXIMATION`. Args: nodes (tuple[int]):
 The node indices to partition. Returns: list[Cut]: All unidirectional partitions. """

    if config.CUT_ONE_APPROXIMATION:
        bipartitions = directed_bipartition_of_one(nodes)
    else:
        # Don't consider trivial partitions where one part is empty
        bipartitions = directed_bipartition(nodes, nontrivial=True)

    return [Cut(bipartition[0], bipartition[1], node_labels)
            for bipartition in bipartitions]