code: def inverse(self, value):
      y, x = [self.vmin, self.vcenter, self.vmax], [0, 0.5, 1]
      return np.interp(value, x, y, left=-np.inf, right=np.inf)
  
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 3 for calling the MidpointNormalize obj's underlying member method code with example usage: obj.inverse(value) and returns: np