Created by: ForFishes

PaddleBoxDataFeed is a new datafeed. It has the following attributes： 1、It mainly has two functions to train

• Merge_Pv_Instance(): It mainly merges instances to Pv(page view) and convey Pv to input_pv_channel_.
• Divide_Pv_Instance(): It mainly divides Pv(page view) to instances and convey instances to input_channel_.

2、It mainly has two phases to train the dataset. 3、It can shift enable_pv_predict to select the mode. 4、It uses pointers to organize data.