def finalize(self):
        self._vectors = []
Removes obsolete entries from _outstanding_request_history.
dataset/ETHPy150Open clips/pattern/pattern/vector/__init__.py/SLP.finalize--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/devappserver2/server.py/AutoScalingServer._trim_outstanding_request_history