code: def read_hash(self):
      if not self.hash:
          self.set_hash(
              hashes.sha256(
                  self.filename,
                  "lora/" + self.name,
                  use_addnet_hash=self.is_safetensors,
              )
              or ""
          )
  
imports: from __future__ import annotations
  import os
  from collections import namedtuple
  import enum
  from modules import sd_models, cache, errors, hashes, shared
label_desc: Use image node_id 4 for calling the NetworkOnDisk obj's underlying member method code with example usage: obj.read_hash() without return types