a                                       data loading
a                                       load data set
0                                       training data set
1                                       header line
1                                       named rows
2                                       number of classes
all_train.dat
aml_train.dat
a                                       load data set
1                                       test data set
1                                       header line
1                                       named rows
2                                       number of classes
all_test.dat
aml_test.dat
x                                       return
x                                       return