Marc

Solution is written here I guess: https://docs.chainer.org/en/stable/reference/generated/chainer.Variable.html https://docs.chainer.org/en/stable/reference/generated/chainer.no_backprop_mode.html#chainer.no_backprop_mode --- _"volatile argument is not supported anymore since v2. Instead, use chainer.no_backprop_mode()."_ ```Python x = chainer.Variable(np.array([1,], np.float32)) with chainer.no_backprop_mode(): y = x...