未训练：
====> Recall@1: 0.3371====> Recall@5: 0.5641====> Recall@10: 0.6631====> Recall@20: 0.7547
维度512第一次训练
====> Recall@1: 0.6359====> Recall@5: 0.8219====> Recall@10: 0.8792====> Recall@20: 0.9261
