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Ports over the step closure functionality from PyTorch/XLA to Lazy Tensor Core: References:205ae574c0/torch_xla/core/xla_model.py (L852-L900)
205ae574c0/torch_xla/utils/closures.py (L7-L83)
CC: @wconstab @JackCaoG @Krovatkin Pull Request resolved: https://github.com/pytorch/pytorch/pull/84300 Approved by: https://github.com/JackCaoG, https://github.com/wconstab