def batch_recommend_items(self,
                              dataset,
                              max_items=10,
                              return_scores=True,
                              show_progress=False,
                              item_features=None):
        recs = []
        for u in xrange(self.num_users):
            if show_progress and u%1000 == 0:
               print u,'..',
            recs.append(self.recommend_items(dataset,u,max_items,return_scores))
        if show_progress:
            print
        return recs
Validate datetime key value.
dataset/ETHPy150Open Mendeley/mrec/mrec/base_recommender.py/BaseRecommender.batch_recommend_items--crossover with--dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/resource.py/_datetime