I can delete this after I've computed with it
@@ -926,4 +926,5 @@ the following on the original dataset, df: `df.groupby(%s).size()`. Expected is
self._concordance_score_ = concordance_index(self.durations,
-self._predicted_partial_hazards_,
self.event_observed)
+ del self._predicted_partial_hazards_
return self._concordance_score_
