code: def add_target_handle(self, layer):
      input_handle = layer.register_forward_hook(get_target_input)
      self.target_handle = input_handle
  
file_path: shap/shap/explainers/_deep/deep_pytorch.py
imports: import warnings
  import numpy
  from packaging import version
  from .._explainer import Explainer
  from .deep_utils import _check_additivity
label_desc: Use image node_id 2 for calling the PyTorchDeep obj's underlying member method code with example usage: obj.add_target_handle(layer) without return types