Fix incorrect installation instructions (for issue #37476) (#37640)

* debugging issue 36758

* debugging issue 36758

* debugging issue 36758

* updated attn_mask type specification in _flash_attention_forward

* removed pdb

* added a blank line

* removed indentation

* update constants

* remove unnecessary files

* created installation script, modified README

* modified requirements and install.sh

* undo irrelevant changes

* removed blank line

* fixing installation guide

* modified README, python requirements, and install script

* removed tests_otuput

* modified README

* discarded installation script and python<3.13 requirement

README.md

@@ -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
@@ -88,10 +87,10 @@ 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.
@@ -99,7 +98,7 @@ Install Transformers from source if you want the latest changes in the library o
 ```shell
 git clone https://github.com/huggingface/transformers.git
 cd transformers
-pip install .
+pip install .[torch]
 ```
 
 ## Quickstart