code: def _infer_output_var(self):
      sym_type = self.type_inference()
  
      # Globally unique var name for placeholders
      if self.name is None:
          self.name = (
              f"{self.__class__.__name__}_{self.__class__.counter}"
          )
          self.__class__.counter += 1
  
      # List of output vars (consistent w/ other ops)
      self.outputs = [Var(self.name, sym_type)]
  
imports: from collections import defaultdict
  from typing import Dict, List
  import numpy
  import sympy
  from coremltools import _logger
  from coremltools.converters.mil._deployment_compatibility import AvailableTarget
  from coremltools.converters.mil.input_types import InputType
  from coremltools.converters.mil.mil.input_type import InternalInputType
  from coremltools.converters.mil.mil.ops.helper import _get_version_of_op
  from coremltools.converters.mil.mil.var import ListVar
  from .None import types
  from .block import Function
  from .operation import Operation
  from .types.symbolic import k_num_internal_syms, k_used_symbols
  from .var import Var
label_desc: Use image node_id 5 for calling the Placeholder obj's underlying member method code with example usage: obj._infer_output_var() without return types