1%s/self/ctx/g 2%s/\s\+def forward/ @staticmethod\r def forward/g 3%s/\s\+def backward/ @staticmethod\r @once_differentiable\r def backward/g 4
1%s/self/ctx/g 2%s/\s\+def forward/ @staticmethod\r def forward/g 3%s/\s\+def backward/ @staticmethod\r @once_differentiable\r def backward/g 4