将Dataframe数据转化为ndarry数据的方法
train_comb 为Dataframe数据:
train_comb= train_comb.as_matrix() #得到values的ndarry train_comb = train_combvalues #得到values的ndarry train_comb = np.array(train_comb) #直接原样转换,加上索引值
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