Fix torch.accelerator AttributeError in tensorqs_tutorial #3664
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The tutorial was using torch.accelerator.is_available() and torch.accelerator.current_accelerator() which causes an AttributeError in PyTorch versions that don't have the accelerator API.
Changed to use the more widely compatible torch.cuda.is_available() and tensor.to('cuda') pattern that works across all PyTorch versions.
Fixes issue where users get: module 'torch' has no attribute 'accelerator'
Fixes #3629
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