code: def gen_image(width, height):
      x_vals = np.linspace(-0.5, 0.5, width)
      y_vals = np.linspace(-0.5, 0.5, height)
  
      grid = np.meshgrid(x_vals, y_vals)
      v_fn = np.vectorize(exp_z_inv)
  
      return v_fn(*grid).astype(np.float32)
  
imports: from vispy import plot
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: gen_image(width, height) and returns: v_fn