code: def _register_hook(self):
      if self._module is not None:
          self._handle = self._module.register_forward_hook(self._hook)
  
imports: from typing import Any, Optional
  from pytorch_lightning import LightningModule
  from torch.utils.data import DataLoader, Sampler
  import flash
  from flash.core.data.io.input import InputBase
  from flash.core.data.io.input_transform import InputTransform
  from flash.core.model import Task
label_desc: Use image node_id 4 for calling the Embedder obj's underlying member method code with example usage: obj._register_hook() without return types