def _load_u2o(self):
if self.u2o:
return
path = self.flags.data_path
p = "%s/u2o.pkl"%path
if os.path.exists(p)==False:
self._load_db()
u2o = self.pdDB.data['orders'].groupby('user_id')['order_id'].apply(list)
u2o.to_pickle(p)
else:
u2o = pd.read_pickle(p)
self.u2o = u2o
print_mem_time("Loaded u2o %d"%len(u2o))
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