pytorch

07ce0b43 - Remove backward for im2col and col2im (#85542)

Remove backward for im2col and col2im (#85542) `im2col` is a linear map, and `col2im` is its adjoint. As such, the adjoint to `col2im` is `im2col` (the adjoint of the adjoint is the original function. There's no point having explicit derivatives in ATen for these functions, so this PR deletes all these. Furthermore, along the way, we fix an error for the derivative of im2col for non-batched inputs. Pull Request resolved: https://github.com/pytorch/pytorch/pull/85542 Approved by: https://github.com/soulitzer, https://github.com/ngimel