class_docstr: Callback that record the mean and std of activations.
docstr: The 'colorful dimension' plot
docstr_tok: ["The","'colorful","dimension","'","plot"]
code: def color_dim(self, idx, figsize=(10, 5), ax=None):
      "The 'colorful dimension' plot"
      res = self.hist(idx)
      if ax is None:
          ax = subplots(figsize=figsize)[1][0]
      ax.imshow(res, origin="lower")
      ax.axis("off")
  
imports: from __future__ import annotations
  from ..basics import *
label_desc: Use image node_id 9 for calling the ActivationStats obj's underlying member method code with example usage: obj.color_dim(idx, figsize, ax) without return types