Pytorch: torch.utils.ffi is deprecated. How do I use cpp extensions instead?

Created on 1 Jan 2019 · 10Comments · Source: pytorch/pytorch

🐛 Bug

Trying to build code with a current pytorch under conda fails with the following error:

ImportError: torch.utils.ffi is deprecated. Please use cpp extensions instead.

To Reproduce

Steps to reproduce the behavior:

On Ubuntu 16.04 x64, download and install anaconda
Create an environment and install pytorch there: conda install -c pytorch pytorch
Follow the instructions to try running this code: https://github.com/ruotianluo/pytorch-faster-rcnn
Get to the ./make.sh part.
Get a ImportError: torch.utils.ffi is deprecated. Please use cpp extensions instead. error

Expected behavior

./make.sh building all the code cleanly

Environment

Collecting environment information...
PyTorch version: 1.0.0
Is debug build: No
CUDA used to build PyTorch: 9.0.176

OS: Ubuntu 16.04.5 LTS
GCC version: (Ubuntu 7.4.0-1ubuntu1~16.04~ppa1) 7.4.0
CMake version: version 3.13.20181022-g64947

Python version: 3.6
Is CUDA available: Yes
CUDA runtime version: 7.5.17
GPU models and configuration: GPU 0: GeForce GTX 750 Ti
Nvidia driver version: 410.79
cuDNN version: Probably one of the following:
/usr/lib/x86_64-linux-gnu/libcudnn.so.7.3.1
/usr/lib/x86_64-linux-gnu/libcudnn_static_v7.a

Versions of relevant libraries:
[pip] Could not collect
[conda] Could not collect

Source

StrangeTcy

Most helpful comment

The problem is related to the version of pytorch you installed. I reduced its version from 1.0 to 0.4, and the problem is solved. Newer is not better!

csjunxu on 25 Feb 2019

😕59 👍38 🎉7 🚀6

All 10 comments

Take a look at https://pytorch.org/tutorials/advanced/cpp_extension.html

ezyang on 3 Jan 2019

😕3

so there is no easy solution to this? it looks like it requires a full revamp of the code that used to work for pytorch <= 0.4.1

IssamLaradji on 4 Jan 2019

😕24 👀3

Unfortunately yes. An example port of some other ffi code is at https://github.com/pytorch/audio/commit/8a41ecdc1ba365fb9d51e12b8ab793bc2a3f67fa but some rewriting is necessary. Let us know if you need help.

ezyang on 4 Jan 2019

😕3 👍2

damn, weeks of work to the trash...

do you plan on deprecating such low-level stuff on a regular basis or is it really worth it trying to make a cpp extension now ?

aliutkus on 14 Jan 2019

👍27

@aliutkus we deprecated the feature after 1.5 years, and we really apologize for not having a structured deprecation path for it (it was technically not possible). We dont plan to deprecate any public API on a regular basis, especially without deprecation warnings over a few releases. This was a special case, and we apologize.

soumith on 14 Jan 2019

😕7 👍4

ok, great. Well I guess it's time to switch from C to C++ =)

thanks for all the work

aliutkus on 15 Jan 2019

👍1

You should change it as "import torch.utils.cpp_extension"

sunny52juli on 15 Jan 2019

😕15 👎6

The problem is related to the version of pytorch you installed. I reduced its version from 1.0 to 0.4, and the problem is solved. Newer is not better!

csjunxu on 25 Feb 2019

😕59 👍38 🎉7 🚀6

I am using torch version 1.4.0 but I got the same issue how can I solve it?