天池大賽o2o優惠券第一名代碼解讀(4)

天天慣例感激web #4.user_merchant: #times_user_buy_merchant_before. all_user_merchant = feature3[['user_id','merchant_id']] all_user_merchant.drop_duplicates(inplace=True) #只保留銷售了商品的商戶id t = feature3

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