code: def add_function_with_prefix(self, fprefix, tfssa):
      assert isinstance(tfssa, SSAFunction)
      s = 0
      while fprefix + str(s) in self.functions:
          s += 1
      self.functions[fprefix + str(s)] = tfssa
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import copy
  import logging
  from coremltools.converters.mil.mil import types
  from .basic_graph_ops import check_connections, const_determined_nodes
  from .dot_visitor import DotVisitor
  from .naming_utils import escape_fn_name
label_desc: Use image node_id 9 for calling the NetworkEnsemble obj's underlying member method code with example usage: obj.add_function_with_prefix(fprefix, tfssa) without return types