class_docstr: Callback that record the mean and std of activations.
code: def __init__(self, with_hist=False, **kwargs):
      super().__init__(**kwargs)
      self.with_hist = with_hist
  
imports: from __future__ import annotations
  from ..basics import *
label_desc: Use image node_id 1 to create a new ActivationStats object from inherited base classes: HookCallback with example: obj = ActivationStats(with_hist)