models/recall召回任务中，基于python3.6环境下，只有w2v不报错，ssr，youtube_dnn，gru4rec，gnn，ncf均报如下错
Created by: xjqbest
复现代码地址：https://github.com/PaddlePaddle/PaddleRec/tree/master/models/recall
分别执行如下命令： python -m paddlerec.run -m paddlerec.models.recall.ssr # ssr python -m paddlerec.run -m paddlerec.models.recall.gru4rec # gru4rec python -m paddlerec.run -m paddlerec.models.recall.gnn # gnn python -m paddlerec.run -m paddlerec.models.recall.ncf # ncf python -m paddlerec.run -m paddlerec.models.recall.youtube_dnn #