code: def _get_samples_delta(self, input_tensor, reference_tensor):
      input_expand_mult = input_tensor.unsqueeze(1)
      sd = input_expand_mult - reference_tensor
      return sd
  
file_path: attributionpriors/attributionpriors/pytorch_ops_cpu.py
imports: import functools
  import operator
  import torch
  from torch.autograd import grad
  from torch.utils.data import DataLoader
label_desc: Use image node_id 3 for calling the AttributionPriorExplainer obj's underlying member method code with example usage: obj._get_samples_delta(input_tensor, reference_tensor) and returns: sd