code: def testIsFunction(self):
      ctx = context.context()
      self.assertFalse(ctx.has_function("not_a_function"))
  
      @def_function.function
      def f():
          return 1.0
  
      self.assertTrue(ctx.has_function(f.get_concrete_function().name))
  
imports: import sys
  import traceback
  import numpy
  from tensorflow.python import pywrap_tfe
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  from tensorflow.python.eager import core
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import resource_variable_ops
label_desc: Use image node_id 14 for calling the Tests obj's underlying member method code with example usage: obj.testIsFunction() and returns: int