def _observe_condition(self, change):
        if self.is_initialized:
            self._refresh_items()
computes stage dependencies by examining their inputs/outputs
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/core/conditional.py/Conditional._observe_condition--crossover with--dataset/ETHPy150Open Mouse-Imaging-Centre/pydpiper/pydpiper/pipeline.py/Pipeline.createEdges