Repository: huggingface/transformers
Pull request: Fix incorrect installation instructions (for issue #37476)

# What does this PR do?

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This PR is a proposed solution for issue #37476. Specifically, this PR modifies description in README.md, adds a requirements.txt file and an install.sh file:
- README.md: change python version requirement from 3.9+ to 3.9-3.12; add feasible installation commands. These changes will also fix the [transformers pypi page](https://pypi.org/project/transformers/).
```py
# venv
python -m venv .my-env
source .my-env/bin/activate
pip install "jax>=0.4.1,<=0.4.13"
pip install "optax>=0.0.8,<=0.1.4"
pip install "orbax-checkpoint==0.2.3"
pip install "torch>=2.1"
pip install "tensorflow>2.9,<2.16"
pip install "flax>=0.4.1,<=0.7.0"
pip install "accelerate>=0.26.0"
```
- requirements.txt: listing the core requirements of the package as specified in [setup.py](https://github.com/huggingface/transformers/blob/6daa3eeba582facb57cd71db8efb66998b12942f/setup.py#L436). Note more variants of requirements.txt should be added, but I'm not sure how to do it. I would be grateful if you could give me some suggestions!
- install.sh: a script that verifies python version, creates the virtual env, installs the core packages, and validates the installation with the [quickstart example](https://github.com/huggingface/transformers?tab=readme-ov-file#quickstart). The script closely follows the version requiremetns in setup.py, and has been tested and worked on my machine. If you encounter any bugs, please tell me so that I can fix accordingly.


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#create-a-pull-request),
      Pull Request section?
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      to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

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Models:

- text models: @ArthurZucker
- vision models: @amyeroberts, @qubvel
- speech models: @eustlb
- graph models: @clefourrier

Library:

- flax: @gante and @Rocketknight1
- generate: @zucchini-nlp (visual-language models) or @gante (all others)
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- tokenizers: @ArthurZucker
- trainer: @zach-huggingface and @SunMarc
- chat templates: @Rocketknight1

Integrations:

- deepspeed: HF Trainer/Accelerate: @SunMarc @zach-huggingface
- ray/raytune: @richardliaw, @amogkam
- Big Model Inference: @SunMarc
- quantization (bitsandbytes, autogpt): @SunMarc @MekkCyber

Documentation: @stevhliu

HF projects:

- accelerate: [different repo](https://github.com/huggingface/accelerate)
- datasets: [different repo](https://github.com/huggingface/datasets)
- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Maintained examples (not research project or legacy):

- Flax: @Rocketknight1
- PyTorch: See Models above and tag the person corresponding to the modality of the example.
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Changed files:
filename: README.md
patch: @@ -78,7 +78,6 @@ Create and activate a virtual environment with [venv](https://docs.python.org/3/
 # venv
 python -m venv .my-env
 source .my-env/bin/activate
-
 # uv
 uv venv .my-env
 source .my-env/bin/activate
@@ -88,18 +87,18 @@ Install Transformers in your virtual environment.
 
 ```py
 # pip
-pip install transformers
+pip install "transformers[torch]"
 
 # uv
-uv pip install transformers
+uv pip install "transformers[torch]"
 ```
 
 Install Transformers from source if you want the latest changes in the library or are interested in contributing. However, the *latest* version may not be stable. Feel free to open an [issue](https://github.com/huggingface/transformers/issues) if you encounter an error.
 
 ```shell
 git clone https://github.com/huggingface/transformers.git
 cd transformers
-pip install .
+pip install .[torch]
 ```
 
 ## Quickstart

filename: setup.py
patch: @@ -484,6 +484,9 @@ def run(self):
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         "Topic :: Scientific/Engineering :: Artificial Intelligence",
     ],
     cmdclass={"deps_table_update": DepsTableUpdateCommand},