class_docstr: Callback that record the mean and std of activations.
code: def plot_layer_stats(self, idx):
      _, axs = subplots(1, 3, figsize=(12, 3))
      for o, ax, title in zip(
          self.layer_stats(idx), axs, ("mean", "std", "% near zero")
      ):
          ax.plot(o)
          ax.set_title(title)
  
imports: from __future__ import annotations
  from ..basics import *
label_desc: Use image node_id 10 for calling the ActivationStats obj's underlying member method code with example usage: obj.plot_layer_stats(idx) without return types