Can't install transformers in Conda environment with python 3.9

Environment info

• transformers version: 4.8.1
• Platform: macOS 11.5.2
• Python version: 3.9.6
• Conda Version: 4.10.3

Information

I’m trying to install transformers in a condo environment and get and error “conda.exceptions.UnsatisfiableError: The following specifications were found to be incompatible with each other:” with blank lines beneath

To reproduce

Steps to reproduce the behavior:

conda create -n py39 python=3.9
conda activate py39
conda install -c huggingface transformers

Verbose conda output of last command:

Collecting package metadata (current_repodata.json): ...working... Unable to retrieve repodata (response: 404) for https://conda.anaconda.org/HuggingFace/osx-64/current_repodata.json

done
Solving environment: ...working... failed with initial frozen solve. Retrying with flexible solve.
Solving environment: ...working... failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): ...working... done
Solving environment: ...working... failed with initial frozen solve. Retrying with flexible solve.
Solving environment: ...working... 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
failed                                                                                                                                                                                                                                  
Traceback (most recent call last):
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/install.py", line 261, in install
    unlink_link_transaction = solver.solve_for_transaction(
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 114, in solve_for_transaction
    unlink_precs, link_precs = self.solve_for_diff(update_modifier, deps_modifier,
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 157, in solve_for_diff
    final_precs = self.solve_final_state(update_modifier, deps_modifier, prune, ignore_pinned,
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 275, in solve_final_state
    ssc = self._add_specs(ssc)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 706, in _add_specs
    raise UnsatisfiableError({})
conda.exceptions.UnsatisfiableError: 
Did not find conflicting dependencies. If you would like to know which
packages conflict ensure that you have enabled unsatisfiable hints.

conda config --set unsatisfiable_hints True
            

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/exceptions.py", line 1079, in __call__
    return func(*args, **kwargs)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/main.py", line 84, in _main
    exit_code = do_call(args, p)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/conda_argparse.py", line 83, in do_call
    return getattr(module, func_name)(args, parser)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/main_install.py", line 20, in execute
    install(args, parser, 'install')
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/install.py", line 308, in install
    raise e
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/cli/install.py", line 295, in install
    unlink_link_transaction = solver.solve_for_transaction(
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 114, in solve_for_transaction
    unlink_precs, link_precs = self.solve_for_diff(update_modifier, deps_modifier,
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 157, in solve_for_diff
    final_precs = self.solve_final_state(update_modifier, deps_modifier, prune, ignore_pinned,
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 275, in solve_final_state
    ssc = self._add_specs(ssc)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/core/solve.py", line 704, in _add_specs
    ssc.r.find_conflicts(spec_set)
  File "/usr/local/anaconda3/lib/python3.8/site-packages/conda/resolve.py", line 352, in find_conflicts
    raise UnsatisfiableError(bad_deps, strict=strict_channel_priority)
conda.exceptions.UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Expected behavior

Installs without error

[LysandreJik]

Unstale, this is an actual issue

[function2-llx]

I’m able to install latest transformers from the huggingface channel with Python 3.9.7.