基于pyspark的ALS模型（交替最小二乘矩阵分解）来实现
- 进行ALS模型训练和预测
python train_cf.py --data_path "./data/ratings.csv" --train_flag True
- 不训练，直接进行ALS模型预测
python train_cf.py --data_path "./data/ratings.csv"
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