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Update README.md and put Python 3.10 a prerequisite (#1821) 

* Update README.md and put Python 3.10 a prerequisite

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Yi Wang 2023-01-25 11:32:50 -08:00 committed by GitHub
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@ -43,15 +43,26 @@ We have few paths to lower down to the Torch MLIR Dialect.
## Install torch-mlir snapshot
This installs a pre-built snapshot of torch-mlir for Python 3.7/3.8/3.9/3.10 on Linux and macOS.
At the time of writing, we release pre-built snapshot of torch-mlir for Python 3.10 on Linux and macOS.
If you have Python 3.10, the following commands initialize a virtual environment.
```shell
python -m venv mlir_venv
python3.10 -m venv mlir_venv
source mlir_venv/bin/activate
# Some older pip installs may not be able to handle the recent PyTorch deps
```
Or, if you want to switch over multiple versions of Python using conda, you can create a conda environment with Python 3.10.
```shell
conda create -n torch-mlir python=3.10
conda activate torch-mlir
python -m pip install --upgrade pip
pip install --pre torch-mlir torchvision -f https://llvm.github.io/torch-mlir/package-index/ --extra-index-url https://download.pytorch.org/whl/nightly/cpu
# This will install the corresponding torch and torchvision nightlies
```
Then, we can install torch-mlir with the corresponding torch and torchvision nightlies.
```
pip install --pre torch-mlir torchvision \
-f https://llvm.github.io/torch-mlir/package-index/
--extra-index-url https://download.pytorch.org/whl/nightly/cpu
```
## Demos