code: def center(x):
      assert type(x) is list, "Input data to center must be list"
      x_stacked = np.vstack(x)
      return [i - np.mean(x_stacked, 0) for i in x]
  
imports: import functools
  import sys
  import numpy
  import copy
  from scipy.interpolate import PchipInterpolator
  import seaborn
  import itertools
  import pandas
  from matplotlib.lines import Line2D
label_desc: Use image node_id 1 for calling a global function with example usage: center(x) and returns: unknown