code: def to_str(self, func_name="function"):
      func_name = func_name + "[{}]".format(_OPSET[self.opset_version])
      if len(self._input_dict) == 0:
          s = func_name + "()"
      else:
          inputs = [
              (in_name, ph) for in_name, ph in self._input_dict.items()
          ]
          s = func_name + "(" + str(inputs[0][1])
          for in_name, ph in inputs[1:]:
              s += ",\n" + " " * (len(func_name) + 1) + str(ph)
          s += ") {\n"
          s += self.indented_str(SPACES)
          s += "}\n"
      return s
  
imports: import copy
  from collections import Counter, OrderedDict
  from typing import Tuple
  from coremltools import _OPSET
  from coremltools import _logger
  from coremltools.converters.mil._deployment_compatibility import AvailableTarget
  from .None import SPACES, types
  from .operation import Operation
  from .types.symbolic import is_symbolic, k_used_symbols
  from .var import ComplexVar, InternalVar, Var
  from .visitors.dot_visitor import DotVisitor
label_desc: Use image node_id 7 for calling the Function obj's underlying member method code with example usage: obj.to_str(func_name) and returns: s