code: def save_csv(X, y, path):
      
  
      if sparse.issparse(X):
          X = X.todense()
  
      np.savetxt(path, np.hstack((y.reshape((-1, 1)), X)), delimiter=',')
docs: Save data as a CSV file.
  
      Args:
          X (numpy or scipy sparse matrix): Data matrix
          y (numpy array): Target vector.
          path (str): Path to the CSV file to save data.