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Update contribution docs to explain how to update libtpu #6551

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Feb 16, 2024
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Update contribution docs to explain how to update libtpu #6551

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Expand Up @@ -112,3 +112,4 @@ Then run `test/run_tests.sh` and `test/cpp/run_tests.sh` to verify the setup is
### Sharp Edges

* If local changes aren't visible, uninstall existing pytorch/xla with `pip uninstall torch_xla` and `pip uninstall torch`, then rebuild PyTorch and PyTorch/XLA with `python setup.py develop` or `python setup.py install`.
* PJRT errors when running on TPU such as `The PJRT plugin has PJRT API version 0.34. The framework PJRT API version is 0.40`. You need to update your `libtpu.so` and ensure it's in your `LD_LIBRARY_PATH` environmental directory. You can download a new `libtpu.so` at [Google Cloud](https://storage.googleapis.com/libtpu-releases/index.html), which are sorted by date. Download the newest one and install it at `pip install libtpu...whl`.