Python 3.8 compatibility

[barrh]

I've noticed that when pip install torch torchvision with Python v3.8, the following is installed: torch v1.4, torchvision v0.2.2.post3.
Trying to install v0.5 of torchvision specifically fails for no matching distribution found.
"ERROR: Could not find a version that satisfies the requirement torchvision==0.5 (from versions: 0.1.6, 0.1.7, 0.1.8, 0.1.9, 0.2.0, 0.2.1, 0.2.2, 0.2.2.post2, 0.2.2.post3)
ERROR: No matching distribution found for torchvision==0.5"

Any reason not to publish Python3.8 compatible build for 0.5?

[pmeier]

From the list of available versions, it seems we stopped supporting python3.8 last year (somewhere between torchvision==0.2.2 in Feb 2019 and torchvision==0.3.0 in May 2019). I don't think there is anything special about torchvision==0.5.0 not supporting it. If you have a look at the official installation instructions python3.8 is not listed as an option. I always thought that means it is not supported. What I find strange is that apparently pip3.8 can install torch==1.4.0.

@fmassa Should we support python3.8 as torch does or is this some unintended feature on their side?

[fmassa]

We still have some build issues with Python 3.8, which haven't been fixed yet, but once they are we will provide packages for those, see #1731

[fmassa]

We now have CI support for Python 3.8 in #1731 and binaries as well thanks to #1717

[chiragraman]

This still seems to be an issue on MacOS (10.15.1):

Running conda install torchvision=0.5.0 -c pytorch -c conda-forge yields the following :

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

Specifications:

  - torchvision=0.5.0 -> python[version='>=2.7,<2.8.0a0|>=3.5,<3.6.0a0|>=3.7,<3.8.0a0|>=3.6,<3.7.0a0']

Your python: python=3.8.0

I believe that the 3.8.0 binaries should be available on the pytorch channel for all platforms following #1717, is that not so @fmassa?

[fmassa]

@chiragraman thanks for the report, indeed it seems that we are missing OSX builds for Python 3.8.

@seemethere could you have a look? From https://anaconda.org/pytorch/torchvision/files we are missing Python 3.8 binaries for OSX

[seemethere]

Taking a look right now

[seemethere]

Issue should now be resolved, closing.