def fit(self, X, y=None):
        pass
Return an iterator for (node, in-degree).
dataset/ETHPy150Open anaderi/lhcb_trigger_ml/hep_ml/experiments/transformations.py/Shuffler.fit--crossover with--dataset/ETHPy150Open gkno/gkno_launcher/src/networkx/classes/multidigraph.py/MultiDiGraph.in_degree_iter