code: def test_isinstance():
      def fun(x):
          assert ag_isinstance(x, dict)
          assert ag_isinstance(x, ag_dict)
          return x["x"]
  
      fun({"x": 1.0})
      grad(fun)({"x": 1.0})
  
file_path: autograd/tests/test_dict.py
imports: import autograd.numpy
  import autograd.numpy.random
  from autograd.test_util import check_grads
  from autograd import dict, isinstance
  from autograd import grad
  import operator
label_desc: Use image node_id 7 for calling a global function with example usage: test_isinstance() and returns: x