in heap.py [0:0]
def _get_value_score(self, cached_score_data):
if not self.use_score_caching:
return self.value_score_function(cached_score_data.value)
else:
if cached_score_data.timestamp != self.timestep:
cached_score_data.score = self.value_score_function(cached_score_data.value)
cached_score_data.timestamp = self.timestep
return cached_score_data.score