def _to_safe_for_reshape(self):
        return self
Return True if node u has predecessor v.
dataset/ETHPy150Open pydata/pandas/pandas/indexes/base.py/Index._to_safe_for_reshape--crossover with--dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingDiGraph.has_predecessor