code: import pandas as pd
  import numpy as np
  from sklearn.datasets import dump_svmlight_file
  
  df1 = pd.read_csv("./dataset/input_label.csv")
  df2 = pd.read_csv("./dataset/input.csv")
  res = pd.merge(df1, df2, how='left', left_on='id', right_on='id')
  
  X = res[np.setdiff1d(res.columns,['label','id'])]
  y = res.label
  
  dump_svmlight_file(X,y,'/host/smvlight.dat',zero_based=True,multilabel=False)
  
apis: pandas.read_csv sklearn.datasets.dump_svmlight_file pandas.merge numpy.setdiff1d