code: def center(X):
      for col in X.columns:
          X.loc[:, col] = X.loc[:, col] - np.mean(X.loc[:, col])
      return X
  
file_path: AIF360/aif360/algorithms/inprocessing/gerryfair/clean.py
imports: import argparse
  import numpy
  import pandas
label_desc: Use image node_id 3 for calling a global function with example usage: center(X) and returns: X