code: def einsum(equation, *operands):
      """
      Forward-log-sum-product-exp backward-marginal implementation of einsum.
      """
      result = pyro.ops.einsum.torch_log.einsum(equation, *operands)
  
      if any(hasattr(x, "_pyro_backward") for x in operands):
          result._pyro_backward = _EinsumBackward(equation, operands)
      return result
  
file_path: pyro/pyro/ops/einsum/torch_marginal.py
imports: import pyro.ops.einsum.torch_log
  from pyro.ops.einsum.adjoint import Backward, transpose
  from pyro.ops.einsum.util import Tensordot
label_desc: Use image node_id 1 for calling a global function with example usage: einsum(equation) and returns: result