Replace direct calls to setup.py with modern alternatives

.github/scripts/setup-env.sh

@@ -80,22 +80,8 @@ if [[ $GPU_ARCH_TYPE == 'cuda' ]]; then
 fi
 echo '::endgroup::'
 
-echo '::group::Install third party dependencies prior to TorchVision install'
-# Installing with `easy_install`, e.g. `python setup.py install` or `python setup.py develop`, has some quirks when
-# when pulling in third-party dependencies. For example:
-# - On Windows, we often hit an SSL error although `pip` can install just fine.
-# - It happily pulls in pre-releases, which can lead to more problems down the line.
-#   `pip` does not unless explicitly told to do so.
-# Thus, we use `easy_install` to extract the third-party dependencies here and install them upfront with `pip`.
-python setup.py egg_info
-# The requires.txt cannot be used with `pip install -r` directly. The requirements are listed at the top and the
-# optional dependencies come in non-standard syntax after a blank line. Thus, we just extract the header.
-sed -e '/^$/,$d' *.egg-info/requires.txt | tee requirements.txt
-pip install --progress-bar=off -r requirements.txt
-echo '::endgroup::'
-
 echo '::group::Install TorchVision'
-python setup.py develop
+pip install -e . -v --no-build-isolation
 echo '::endgroup::'
 
 echo '::group::Install torchvision-extra-decoders'

CONTRIBUTING.md

@@ -58,11 +58,11 @@ details.
 ```bash
 git clone https://github.com/pytorch/vision.git
 cd vision
-python setup.py develop  # use install instead of develop if you don't care about development.
+pip install -e . -v --no-build-isolation  # leave out the -e switch if you don't care about development.
 # or, for OSX
-# MACOSX_DEPLOYMENT_TARGET=10.9 CC=clang CXX=clang++ python setup.py develop
+# MACOSX_DEPLOYMENT_TARGET=10.9 CC=clang CXX=clang++ pip install -e . -v --no-build-isolation
 # for C++ debugging, use DEBUG=1
-# DEBUG=1 python setup.py develop
+# DEBUG=1 pip install -e . -v --no-build-isolation
 ```
 
 By default, GPU support is built if CUDA is found and `torch.cuda.is_available()` is true. It's possible to force

README.md

@@ -71,7 +71,7 @@ Torchvision currently supports the following video backends:
 
 ```
 conda install -c conda-forge 'ffmpeg<4.3'
-python setup.py install
+pip install . -v --no-build-isolation
 ```
 
 # Using the models on C++

torchvision/csrc/io/decoder/gpu/README.rst

@@ -18,4 +18,4 @@ GPU decoder depends on ffmpeg for demuxing, uses NVDECODE APIs from the nvidia-v
 
 .. code:: bash
 
-    python setup.py install
+    pip install . -v --no-build-isolation