code: def _create_var_from_spec(spec):
      """
      This helper function is used for creating PyMIL Var/ListVar from the proto spec.
      Mainly used for the construction of the control flow ops.
      """
      assert isinstance(spec, pm.NamedValueType)
      sym_type = proto_to_types(spec.type)
      name = spec.name
      if types.is_list(sym_type):
          var = ListVar(
              name,
              elem_type=sym_type.T[0],
              init_length=sym_type.T[1],
              dynamic_length=sym_type.T[2],
          )
      else:
          var = Var(name, sym_type, None, op=None, op_output_idx=None)
      return var
  
imports: import os
  import numpy
  from coremltools import _logger
  from coremltools.converters.mil._deployment_compatibility import AvailableTarget
  from coremltools.converters.mil.backend.mil import helper
  from coremltools.converters.mil.mil import Block
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import Function, ListVar, Placeholder, Program, TupleInputType, Var, mil_list, types
  from coremltools.converters.mil.mil.block import curr_block
  from coremltools.converters.mil.mil.ops.registry import SSAOpRegistry
  from coremltools.proto import MIL_pb2
  from coremltools.proto import Model_pb2
  from .helper import proto_to_types
label_desc: Use image node_id 5 for calling a global function with example usage: _create_var_from_spec(spec) and returns: var