def clear(self):
        for cacheItemId in self._cacheItems.keys():
            cacheItem = self._cacheItems[cacheItemId]
            cacheItem.clear()
            del self._cacheItems[cacheItemId]
drop all the caches stored in this cache region
dataset/ETHPy150Open skyostil/tracy/src/generator/Cheetah/CacheRegion.py/CacheRegion.clear