DataFrame数据格式转换成FFM格式
pandas_onehot函数 ：首先需要将数据转为onthot编码
data_convert2ffm函数：其次将编码后的数据转为ffm格式数据
The data format of LIBFFM is:
:: ::...
field and index 是非负整数 （具体格式显示有问题，打开readme查看）
field：为同一onehot前的变量字段（即大的一个域）
index：为编码后的字段的列序号
value：为对一个的变量值
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