Installation failed on Win10

[csherwood-usgs]

In my experience, building wheels is asking for problems in installations. I guess I have to install MSV C++ 14 or better. Ugh.

`Installing pip dependencies: \ Ran pip subprocess with arguments: ['C:\Users\csherwood\Anaconda3\envs\doodler-dev\python.exe', '-m', 'pip', 'install', '-U', '-r', 'C:\crs\src\holodoodler\condaenv.nvb2thvv.requirements.txt'] Pip subprocess output: Collecting git+https://github.com/li-plus/pydensecrf.git@0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9 (from -r C:\crs\src\holodoodler\condaenv.nvb2thvv.requirements.txt (line 1)) Cloning https://github.com/li-plus/pydensecrf.git (to revision 0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9) to c:\users\csherw~1\appdata\local\temp\1\pip-req-build-5lzf4b63 Resolved https://github.com/li-plus/pydensecrf.git to commit 0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9 Installing build dependencies: started Installing build dependencies: finished with status 'done' Getting requirements to build wheel: started Getting requirements to build wheel: finished with status 'done' Preparing metadata (pyproject.toml): started Preparing metadata (pyproject.toml): finished with status 'done' Building wheels for collected packages: pydensecrf Building wheel for pydensecrf (pyproject.toml): started Building wheel for pydensecrf (pyproject.toml): finished with status 'error' Failed to build pydensecrf

Pip subprocess error: Running command git clone --filter=blob:none --quiet https://github.com/li-plus/pydensecrf.git 'C:\Users\CSHERW~1\AppData\Local\Temp\1\pip-req-build-5lzf4b63' Running command git rev-parse -q --verify 'sha^0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9' Running command git fetch -q https://github.com/li-plus/pydensecrf.git 0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9 Running command git checkout -q 0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9 error: subprocess-exited-with-error

× Building wheel for pydensecrf (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> [11 lines of output] running bdist_wheel running build running build_py creating build creating build\lib.win-amd64-cpython-37 creating build\lib.win-amd64-cpython-37\pydensecrf copying pydensecrf\utils.py -> build\lib.win-amd64-cpython-37\pydensecrf copying pydensecrf__init__.py -> build\lib.win-amd64-cpython-37\pydensecrf running build_ext building 'pydensecrf.eigen' extension error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/ [end of output]

note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for pydensecrf ERROR: Could not build wheels for pydensecrf, which is required to install pyproject.toml-based projects

failed

CondaEnvException: Pip failed

`

[csherwood-usgs]

After installing MSVC, the installation went well, but I don't think we can expect end users to do that.

[maximlt]

Yes you're right, the current situation is not ideal and is due to the fact that there are no conda versions of pydensecrf for Python versions > 3.6, and we don't really want the app to get stuck on Python 3.6 since Panel now only supports Python >= 3.7 (as most of the PyData ecosystem does).

I've just opened a PR on pydensecrf to try to get things moving:

https://github.com/lucasb-eyer/pydensecrf/pull/116

[dbuscombe-usgs]

@csherwood-usgs On Windows, I just managed to install pydensecrf using the VS2015 runtime anaconda package, which is faster and simpler than the slow 7GB installation from Microsoft

conda install -c anaconda vs2015_runtime

then

pip install git+https://github.com/li-plus/pydensecrf.git@0d53acbcf5123d4c88040fe68fbb9805fc5b2fb9

[maximlt]

Oh very nice trick, I should add that to the README, thanks!