Now have mean and sum working. Had to use an ugly workaround because of the way numpy handles keepdims for subclasses.
Now have mean and sum working. Had to use an ugly workaround because
of the way numpy handles keepdims for subclasses.

hips/autograd,HIPS/autograd,jackkamm/autograd,FighterLYL/autograd,hips/autograd,HIPS/autograd,t1m0thy/autograd,barak/autograd,melgor/autograd,kcarnold/autograd