class_docstr: Callback that record the mean and std of activations.
code: def hist(self, idx):
      res = self.stats.itemgot(idx).itemgot("hist")
      return torch.stack(tuple(res)).t().float().log1p()
  
imports: from __future__ import annotations
  from ..basics import *
label_desc: Use image node_id 8 for calling the ActivationStats obj's underlying member method code with example usage: obj.hist(idx) and returns: torch