ERROR: ResolutionImpossible

[ra4-z]

I use conda to create python3.9, and then enter this directory and use command, "pip install . -i https://pypi.tuna.tsinghua.edu.cn/simple"(coz I'm in China), to install the environment. But something goes wrong.

Details are as follows:

$ conda create -n vivit python=3.9 -y
$ conda activate vivit
$ python -m pip install --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple
$ pip install . -i https://pypi.tuna.tsinghua.edu.cn/simple

......
Collecting jax>=0.2.21
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/61/0a/9aef811fa9a5a1f0eb7e3a05a97c6ed89d0956788a83c3195088049cc882/jax-0.2.28.tar.gz (887 kB)
  Preparing metadata (setup.py) ... done
INFO: pip is looking at multiple versions of immutabledict to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of flax to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of clu to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of absl-py to determine which version is compatible with other requirements. This could take a while.
INFO: pip is looking at multiple versions of scenic to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install scenic because these package versions have conflicting dependencies.

The conflict is caused by:
    tf-models-nightly 2.8.0.dev20220217 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220216 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220215 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220214 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220213 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220212 depends on tf-nightly
    tf-models-nightly 2.8.0.dev20220211 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220210 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220209 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220208 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220207 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220206 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220205 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220204 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220203 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220202 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220201 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220131 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220130 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220129 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220128 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220127 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220126 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220125 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220124 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220123 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220122 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220121 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220120 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220119 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220118 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220117 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220116 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220115 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220114 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220113 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220112 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220111 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220110 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220109 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220108 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220107 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220106 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220105 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220104 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220103 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220102 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20220101 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211231 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211230 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211229 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211228 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211227 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211226 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211225 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211224 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211223 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211222 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211221 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211220 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211219 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211218 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211217 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211216 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211215 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211214 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211213 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211212 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211211 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211210 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211209 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211208 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211207 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211206 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211205 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211204 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211203 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211202 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211201 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211130 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211129 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211128 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211127 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211126 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211125 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211124 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211123 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211122 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211121 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211120 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211119 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211118 depends on tf-nightly
    tf-models-nightly 2.7.0.dev20211117 depends on tf-nightly

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

What should I do to fix this? I don't know how to balance the versions of all dependecies, which I guess can solve it.

[ra4-z]

Chinese pip resource websites haven't included the dependency, tf-nightly, yet. So, in Chinese mainland, you need to download the .whl file to install it to get a better downloading speed.

[MostafaDehghani]

Thank you @Shengyuan-Z for adding a response on the fix you found. We had no idea about potential issue and your response is a good pointer for future similar problems.