code: def scale_identity(h, D=None, avg_d=None):
      """
      Identity scaling function.
  
      Parameters
      ----------
      h : torch.Tensor
          Input tensor.
      D : torch.Tensor, optional
          Degree tensor.
      avg_d : dict, optional
          Dictionary containing averages over the training set.
  
      Returns
      -------
      torch.Tensor
          Scaled input tensor.
      """
      return h
  
file_path: deepchem/deepchem/utils/graph_utils.py
imports: import numpy
label_desc: Use image node_id 9 for calling a global function with example usage: scale_identity(h, D, avg_d) and returns: h