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C lib loading: add fallback with sensible error msg

Show slow test durations.

Fix trailing whitespace.

* Refresh content for README.md

* Update accelerator support chart

* Add HPU to accelerator table in README

* update readme for intel XPU

* Add aarch64 cpu tests and CUDA build to nightly workflow

* aarch64: limit CUDA targets to sm75, sm80, sm90, sm100

* aarch64: limit CUDA targets to sm75, sm80, sm90, sm100

* Update build cpu script

* fix

* Update auditwheel for aarch64

* Update python-package.yml

* Update python-package.yml

* Update python-package.yml

* Cleanup

* Matrix update

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Co-authored-by: Matthew Douglas <38992547+matthewdouglas@users.noreply.github.com>

* Run unit tests on GH Actions

* fix

* fix

* trigger workflow

* Update

* Update

* Update

* Run tests nightly

* Disable paged optimizer test on Windows

* Skip unit tests on Windows for CUDA 12.x (driver on runner is too old)

* Additional 4bit CPU ops

* Additional 4bit CPU ops

* Implement additional device-agnostic ops and test updates

* More test fixes

* int8 tests passing

* Fix feature flag for multi_backend

Signed-off-by: jiqing-feng <jiqing.feng@intel.com>

* Stop building for CUDA toolkit < 11.8

* Simplify

* Drop sm70 from cu128 build targets to align with pytorch

* Include device support tags for transformers multi-backend compatability; add xpu() and cpu() to Params4bit

* Make test suite more device-agnostic

* Additional device agnostic tests

* Additional device agnosticism for tests

* Add BNB_TEST_DEVICE env var to manually select device for unit tests

* Include device support tags for transformers multi-backend compatability; add xpu() and cpu() to Params4bit

* Make test suite more device-agnostic

* Additional device agnostic tests

* Additional device agnosticism for tests

* Add BNB_TEST_DEVICE env var to manually select device for unit tests

* Small bugfix for int8 test

* Exclude backward() from code coverage reports

* Params4bit: don't try to quantize when moving to meta device

* fix: Improve CUDA version detection and error handling

* lint fix

* lint fix

* [fix] define blocksize

define blocksize as just showing number is a bit confusing

* [fix] match code with ademamix

also define blocksize as in prev commit

Co-authored-by: Titus von Koeller <9048635+Titus-von-Koeller@users.noreply.github.com>