old_contents: from __future__ import absolute_import
  from .container_types import make_tuple, make_list, make_dict
  from .convenience_wrappers import (
      make_vjp, grad, multigrad_dict, elementwise_grad, value_and_grad,
      grad_and_aux, hessian_tensor_product, hessian_vector_product, hessian,
      jacobian, tensor_jacobian_product, vector_jacobian_product, grad_named,
      checkpoint, make_hvp, make_jvp, make_ggnvp, make_jvp,
      deriv, holomorphic_grad)
  
new_contents: from __future__ import absolute_import
  from .container_types import make_tuple, make_list, make_dict
  from .convenience_wrappers import (
      make_vjp, grad, multigrad_dict, elementwise_grad, value_and_grad,
      grad_and_aux, hessian_tensor_product, hessian_vector_product, hessian,
      jacobian, tensor_jacobian_product, vector_jacobian_product, grad_named,
      checkpoint, make_hvp, make_jvp, make_ggnvp, make_jvp,
      deriv, holomorphic_grad)
  from .core import primitive, notrace_primitive
  
  isinstance = notrace_primitive(isinstance)
  
subject: add a primitive isinstance to autograd/__init__.py