code: def _inverse(x):
      return x**2
  
file_path: matplotlib/galleries/users_explain/colors/colormapnorms.py
imports: import matplotlib.pyplot
  import numpy
  from matplotlib import cm
  import matplotlib.cbook
  import matplotlib.colors
label_desc: Use image node_id 2 for calling a global function with example usage: _inverse(x) and returns: unknown