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Support fused_sgd_kernel support for CPU. ## Bench result: 32 core/sockets ICX Test Scripts: https://gist.github.com/zhuhaozhe/79e842e0a6e25d6d7fa1e4598807272c https://gist.github.com/zhuhaozhe/b4c6998a509dcea1796dd05b3005c969 ``` Tensor Size: 262144, Num Tensor 4, Num Threads: 1 _single_tensor_adagrad time: 0.2500 seconds _fused_adagrad time: 0.0933 seconds Tensor Size: 4194304, Num Tensor 32, Num Threads: 32 _single_tensor_adagrad time: 2.8819 seconds _fused_adagrad time: 1.7591 seconds ``` ## Test Plan: ``` python test_optim.py -k test_fused_matches_forloop python test_optim.py -k test_fused_large_tensor python test_optim.py -k test_can_load_older_state_dict python test_optim.py -k test_grad_scaling_autocast_fused_optimizers python test_torch.py -k test_grad_scaling_autocast_fused python test_torch.py -k test_params_invalidated_with_grads_invalidated_between_unscale_and_step ``` Co-authored-by: Jane (Yuan) Xu <31798555+janeyx99@users.noreply.github.com> Pull Request resolved: https://github.com/pytorch/pytorch/pull/124905 Approved by: https://github.com/jgong5, https://github.com/janeyx99