tom:

((<AccumulateGrad object at 0x7fbe7aa96780>, 0), (<AddBackward0 object at 0x7fbe7aa96748>, 0))
((<AccumulateGrad object at 0x7fbe7aa96780>, 0), (None, 0))
True



Hi Tom,
what about the tuple (None, 0)?

it seems to be the backprop function for the constant 2.