Error installing transformers 3.1.0
## Environment info
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- `transformers` version: 3.1.0
- Platform: Darwin-19.6.0-x86_64-i386-64bit
- Python version: 3.7.7
- PyTorch version (GPU?): 1.6.0 (False)
- Tensorflow version (GPU?): not installed (NA)
- Using GPU in script?: No
- Using distributed or parallel set-up in script?: No

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## Information

Model I am using (Bert, XLNet ...):
pipeline("zero-shot-classification")

The problem arises when using:
pip3 install transformers=="3.1.0"

The tasks I am working on is:
Just installing the package to use zero-shot-classification

## To reproduce

Steps to reproduce the behavior:

1. pip3 install transformers=="3.1.0"

Alternatively:
1. pip3 install tokenizers=="0.8.1.rc2"


Notes:
It seems that the tokenizers version '0.8.1.rc2' is the issue. I can install the system just fine on different systems by changing the version to '0.8.0' in transformers/setup.py. Alternatively pip3 install transformers=="3.1.0" tokenizers=="0.8.0" seems to be a working method of installation, but tokenizers version "0.8.1.rc2" still has the error. 

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  error: build failed
  /tmp/pip-build-env-mey29riz/overlay/lib/python3.6/site-packages/setuptools/dist.py:452: UserWarning: Normalizing '0.8.1.rc2' to '0.8.1rc2'
    warnings.warn(tmpl.format(**locals()))
  cargo rustc --lib --manifest-path Cargo.toml --features pyo3/extension-module --release --verbose -- --crate-type cdylib
  error: cargo failed with code: 101
  ERROR: Failed building wheel for tokenizers
  Running setup.py clean for tokenizers
Failed to build tokenizers
ERROR: Could not build wheels for tokenizers which use PEP 517 and cannot be installed directly

## Expected behavior

<!-- A clear and concise description of what you would expect to happen. -->

The expected behaviour would be to install properly without error.
Yeah the latest release of tokenizers is 0.8.1 but the current code still references the rc2:
https://github.com/huggingface/transformers/blob/master/setup.py#L113<|||||>I was able to get this working by installing tokenizers 0.8.1. I then
installed transformers 3.1.0 without dependencies using --no-dependencies
flag (had to install a few other dependencies manually).

Your mileage may vary.

On Fri, Sep 11, 2020 at 23:21 Fabrizio Milo <notifications@github.com>
wrote:

>
>
> Yeah the latest release of tokenizers is 0.8.1 but the current code still
> references the rc2:
>
>
> https://github.com/huggingface/transformers/blob/master/setup.py#L113
>
>
>
>
> —
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> Reply to this email directly, view it on GitHub
> <https://github.com/huggingface/transformers/issues/6970#issuecomment-691394983>,
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>
<|||||>I simply installed the transformer 3.0.0 version until they fix this problem. 
`python3 -m pip install transformers==3.0.0`<|||||>> I simply installed the transformer 3.0.0 version until they fix this problem.
> `python3 -m pip install transformers==3.0.0`

I need version 3.1.0 for the latest 0-shot pipeline. But the following fixed the problem that @alexuadler mentioned:

pip3 install tokenizers=="0.8.1"
pip3 install transformers=="3.1.0" --no-dependencies<|||||>This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
