old_contents: import autodiff.compat
  
  from autodiff.symbolic import Function, Gradient
  from autodiff.decorators import function, gradient
  from autodiff.constant import Constant
  
  # from fmin_scipy import fmin_l_bfgs_b
  # from fmin_sgd import fmin_sgd
  # from fmin_sgd import FMinSGD
  
  
  
new_contents: import autodiff.optimize
  
  from autodiff.symbolic import Function, Gradient, HessianVector
  from autodiff.decorators import function, gradient, hessian_vector
  from autodiff.constant import Constant
  
  
subject: update init