问题
I was provided with an environment.ubuntu.yml file to be able to create a conda environment. However, running conda create env --file environment.ubuntu.yml I get the following output:
conda env create --file environment.ubuntu.yml
Collecting package metadata (repodata.json): done
Solving environment: -
Found conflicts! Looking for incompatible packages.
This can take several minutes. Press CTRL-C to abort.
Examining fontconfig: 5%|▉ | 10/202 [00:00<00:00, 5393.91it/ ]
Comparing specs that have this dependency: 0%| | 0/12 [00:00<?, ?it/s]
Finding shortest confli| path for fontconfig==2.13.1=he4413a7_1000: 12%|▏| 1/8
Finding shortest conflict path for fontconfig==2.13.1=he4413a7_1000: 25%|▎| 2/8
Finding shortest conflict pa/ for fontconfig[version='>=2.13.0,<3.0a0']: 25%|
Finding shortest conflict path for fontconfig[version='>=2.13.0,<3.0a0']: 38%|
Finding shortest conf- ct path for fontconfig[version='>=2.11.1']: 38%|▍| 3/8 [
Finding shortest conflict path for fontconfig[version='>=2.11.1']: 50%|▌| 4/8 [
Finding shortest conflict pa| for fontconfig[version='>=2.12.4,<3.0a0']: 50%|
...
The Finding shortest conflict path goes on for a long time - apparently it is trying to resolve some dependency issues. Running for 2 hours it is not clear if it will ever stop.
My question is: what is happening here and can I somehow manually speed up this process, e.g. by removing unnecessary dependencies? Since I did not create the environment I don't know which are actually necessary.
The reason why I'm curious is because it is checking conflict paths like fontconfig[version='>=2.12.6,<3.0a0'] when the one in dependencies is 2.13.1 and I have installed it through 2.13.1
Please find below the .yml file for reference.
name: cea
channels:
- https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
- dlr-sc
- https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
- conda-forge
- conda-forge/label/gcc7
- defaults
dependencies:
- attrs=19.1.0=py_0
- backports=1.0=py_2
- backports.functools_lru_cache=1.5=py_1
- backports_abc=0.5=py_1
- boost-cpp=1.68.0=h11c811c_1000
- bzip2=1.0.6=h14c3975_1002
- ca-certificates=2019.3.9=hecc5488_0
- cairo=1.14.12=h80bd089_1005
- certifi=2019.3.9=py27_0
- click=7.0=py_0
- click-plugins=1.0.4=py_0
- cligj=0.5.0=py_0
- curl=7.64.1=hf8cf82a_0
- cycler=0.10.0=py_1
- descartes=1.1.0=py_2
- enum34=1.1.6=py27_1001
- expat=2.2.5=hf484d3e_1002
- fiona=1.8.6=py27hf242f0b_2
- fontconfig=2.13.1=he4413a7_1000
- freetype=2.10.0=he983fc9_0
- freexl=1.0.5=h14c3975_1002
- functools32=3.2.3.2=py_3
- futures=3.2.0=py27_1000
- gdal=2.4.1=py27h5f563d9_8
- geopandas=0.4.1=py_1
- geos=3.7.1=hf484d3e_1000
- geotiff=1.4.3=h1105359_1000
- gettext=0.19.8.1=hc5be6a0_1002
- giflib=5.1.7=h516909a_1
- glib=2.56.2=had28632_1001
- hdf4=4.2.13=h9a582f1_1002
- hdf5=1.10.4=nompi_h3c11f04_1106
- icu=58.2=hf484d3e_1000
- jpeg=9c=h14c3975_1001
- json-c=0.13.1=h14c3975_1001
- kealib=1.4.10=h1978553_1003
- kiwisolver=1.0.1=py27h6bb024c_1002
- krb5=1.16.3=h05b26f9_1001
- libblas=3.8.0=4_openblas
- libcblas=3.8.0=4_openblas
- libcurl=7.64.1=hda55be3_0
- libdap4=3.19.1=hd48c02d_1000
- libedit=3.1.20170329=hf8c457e_1001
- libffi=3.2.1=he1b5a44_1006
- libgdal=2.4.1=heae24aa_8
- libiconv=1.15=h516909a_1005
- libkml=1.3.0=h328b03d_1009
- liblapack=3.8.0=4_openblas
- libnetcdf=4.6.2=hbdf4f91_1001
- libpng=1.6.36=h84994c4_1000
- libpq=11.2=h4770945_0
- libspatialindex=1.9.0=he1b5a44_0
- libspatialite=4.3.0a=hb5ec416_1026
- libssh2=1.8.2=h22169c7_2
- libtiff=4.0.10=h648cc4a_1001
- libuuid=2.32.1=h14c3975_1000
- libxcb=1.13=h14c3975_1002
- libxml2=2.9.8=h143f9aa_1005
- mapclassify=1.0.1=py27_1
- matplotlib=2.2.3=py27h8a2030e_1
- matplotlib-base=2.2.3=py27h60b886d_1
- munch=2.3.2=py_0
- ncurses=6.1=hf484d3e_1002
- numpy=1.16.2=py27h8b7e671_1
- openblas=0.3.5=h9ac9557_1001
- openjpeg=2.3.0=hf38bd82_1003
- openssl=1.1.1b=h14c3975_1
- pandas=0.24.2=py27hf484d3e_0
- pip=19.0.3=py27_0
- pixman=0.34.0=h14c3975_1003
- poppler=0.67.0=h2fc8fa2_1002
- poppler-data=0.4.9=1
- postgresql=11.2=h61314c7_0
- proj4=5.2.0=h14c3975_1001
- pthread-stubs=0.4=h14c3975_1001
- pyparsing=2.3.1=py_0
- pyproj=1.9.6=py27hc0953d3_1000
- pyqt=5.6.0=py27h13b7fb3_1008
- python=2.7.15=h721da81_1008
- python-dateutil=2.8.0=py_0
- pytz=2018.9=py_0
- readline=7.0=hf8c457e_1001
- rtree=0.8.3=py27h666c49c_1002
- scipy=1.2.1=py27h09a28d5_1
- setuptools=40.8.0=py27_0
- shapely=1.6.4=py27h2afed24_1003
- singledispatch=3.4.0.3=py27_1000
- sip=4.18.1=py27hf484d3e_1000
- six=1.12.0=py27_1000
- sqlite=3.26.0=h67949de_1001
- subprocess32=3.5.3=py27h14c3975_0
- tbb=2019.5=hc9558a2_0
- tk=8.6.9=h84994c4_1001
- tornado=5.1.1=py27h14c3975_1000
- tzcode=2018g=h14c3975_1001
- wheel=0.33.1=py27_0
- xerces-c=3.2.2=hac72e42_1001
- xorg-kbproto=1.0.7=h14c3975_1002
- xorg-libice=1.0.9=h516909a_1004
- xorg-libsm=1.2.3=h84519dc_1000
- xorg-libx11=1.6.7=h14c3975_1000
- xorg-libxau=1.0.9=h14c3975_0
- xorg-libxdmcp=1.1.3=h516909a_0
- xorg-libxext=1.3.4=h516909a_0
- xorg-libxrender=0.9.10=h516909a_1002
- xorg-renderproto=0.11.1=h14c3975_1002
- xorg-xextproto=7.3.0=h14c3975_1002
- xorg-xproto=7.0.31=h14c3975_1007
- xz=5.2.4=h14c3975_1001
- zlib=1.2.11=h14c3975_1004
- freeimageplus=3.18.0=hf484d3e_2
- gl2ps=1.3.8=h14c3975_4
- oce=0.17.2=h6bb024c_10
- pythonocc-core=0.17=py27_1
- mkl=2017.0.3=0
- mkl-service=1.1.2=py27_3
- dbus=1.13.2=h714fa37_1
- gst-plugins-base=1.14.0=hbbd80ab_1
- gstreamer=1.14.0=hb453b48_1
- libgcc-ng=8.2.0=hdf63c60_1
- libgfortran-ng=7.3.0=hdf63c60_0
- libstdcxx-ng=8.2.0=hdf63c60_1
- pcre=8.43=he6710b0_0
- qt=5.6.3=h8bf5577_3
- pip:
- alabaster==0.7.12
- babel==2.6.0
- backports.shutil-get-terminal-size==1.0.0
- bleach==3.1.0
- chardet==3.0.4
- cloudpickle==0.8.1
- configparser==3.7.4
- cvxopt==1.2.3
- decorator==4.4.0
- defusedxml==0.5.0
- docutils==0.14
- doit==0.29.0
- entrypoints==0.3
- ephem==3.7.6.0
- funcsigs==1.0.2
- h5py==2.9.0
- idna==2.8
- imagesize==1.1.0
- importlib-resources==1.0.2
- ipaddress==1.0.22
- ipykernel==4.10.0
- ipython==5.8.0
- ipython-genutils==0.2.0
- ipywidgets==7.4.2
- jinja2==2.10
- joblib==0.12.5
- jsonschema==3.0.1
- jupyter==1.0.0
- jupyter-client==5.2.4
- jupyter-console==5.2.0
- jupyter-core==4.4.0
- llvmlite==0.28.0
- lxml==4.3.3
- markupsafe==1.1.1
- mistune==0.8.4
- mock==2.0.0
- nbconvert==5.4.1
- nbformat==4.4.0
- networkx==2.2
- notebook==5.7.8
- numba==0.43.1
- packaging==19.0
- pandocfilters==1.4.2
- pathlib2==2.3.3
- patsy==0.5.1
- pbr==5.1.3
- pexpect==4.6.0
- pickleshare==0.7.5
- pkginfo==1.5.0.1
- plotly==3.7.1
- prometheus-client==0.6.0
- prompt-toolkit==1.0.15
- ptyprocess==0.6.0
- py4design==0.27
- pycollada==0.6
- pygments==2.3.1
- pyinotify==0.9.6
- pymc3==3.6
- pymf==0.1.9
- pyrsistent==0.14.11
- pysal==1.14.4.post2
- pyshp==2.1.0
- pyyaml==5.1
- pyzmq==18.0.1
- qtconsole==4.4.3
- readme-renderer==24.0
- requests==2.21.0
- requests-toolbelt==0.9.1
- retrying==1.3.3
- salib==1.2
- scandir==1.10.0
- scikit-learn==0.20.3
- seaborn==0.9.0
- send2trash==1.5.0
- simplegeneric==0.8.1
- snowballstemmer==1.2.1
- sphinx==1.8.5
- sphinxcontrib-websupport==1.1.0
- terminado==0.8.2
- testpath==0.4.2
- theano==1.0.4
- timezonefinder==4.0.1
- tqdm==4.31.1
- traitlets==4.3.2
- twine==1.13.0
- typing==3.6.6
- urllib3==1.24.1
- utm==0.4.2
- wcwidth==0.1.7
- webencodings==0.5.1
- widgetsnbextension==3.4.2
- xlrd==1.2.0
- xlwt==1.3.0
- deap==1.3.0
回答1:
In my case, I had replaced some of the build versions (the ...=he4413a7_1000 part) as the ones in the original file had been relabelled as broken on conda-forge. However, even though the version number hadn't changed for these dependencies, their subdependencies had changed, causing all these conflicts. The bottom line is: don't mess with dependencies manually.
I solved the problem by keeping the original build version specifications, and adding conda-forge/labels/broken to the channels part of the .ymlfile.
回答2:
This error and the subsequent behaviour is very likely coming from the Anaconda bug which from time to time causes inconsistencies in the local environment. As of Jan 26th, 2020 the bug was not yet resolved.
For me the same problem manifests profoundly on Mac.
回答3:
In general, the answer to this question is that you should create your .yml from hand by scratch, with only the required channels and constraints. You should relax the version constraints so that they only look like 1.19 instead of 1.19.10
However, despite following this advice, I have almost exactly your problem right now. It spent many hours on fontconfig and I left it overnight before giving up. My spec is pretty simple:
channels:
- conda-forge
- usgs-astrogeology
- defaults
dependencies:
- python=3.6
- isis3
- gdal=2.3
I'll edit this when I figure it out.
回答4:
For me worked best to do:
which python (confirming that it was in the anaconda3 bin)
python --version
conda search "^python$"
Note which version matches the version (here 3.7.3) in use for Anaconda (since I'm making a new environment, it stands to reason that I could use the same version of Python that Anaconda itself is using). Note that my listing from the conda channels (conda search above) showed only one 3.7.3 line.
Then do this:
conda create -n myenv python=3.7.3 anaconda
Took about 1 minute to run the last command :)
来源：https://stackoverflow.com/questions/58216917/create-conda-environment-found-conflicts-when-solving-environment-and-findi