code: def process(self, message):
      sample1 = self.argmax
      sample2 = message
      return einsum_backward_sample(self.operands, sample1, sample2)
  
file_path: pyro/pyro/ops/einsum/torch_map.py
imports: import operator
  from functools import reduce
  from pyro.ops import packed
  from pyro.ops.einsum.adjoint import Backward, einsum_backward_sample, transpose, unflatten
  from pyro.ops.einsum.util import Tensordot
label_desc: Use image node_id 2 for calling the _EinsumBackward obj's underlying member method code with example usage: obj.process(message) and returns: einsum_backward_sample