fix(backend-detection): default to CPU if there is less than 4GB of GPU available #6057
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Description
Currently, automatic backend detection will detect also iGPUs. This might not be the best thing to do automatically, hence we do add a check here to check the available VRAM first, if we have more than 4GB and we detect a gpu we select automatically the correct vendor, othertwise we default to GPU. Note that this behavior can still be override via env variable.
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