What is a Variable? Why did it exist as a wrapper in the first place? Why did it get removed? How did we remove it? What are some of the lingering consequences of its removal?Further reading:<ul><li>The release notes of PyTorch 0.4 do a good job explaining the user visible consequences of the removal, at the time, including how we "simulate" concepts on Variable that don't make sense anymore <a href="https://pytorch.org/blog/pytorch-0_4_0-migration-guide/">https://pytorch.org/blog/pytorch-0_4_0-migration-guide/</a></li><li>Part 1: Removal of Variable wrapper in C++ <a href="https://github.com/pytorch/pytorch/pull/17072">https://github.com/pytorch/pytorch/pull/17072</a></li><li>Part 2: Merge of Variable and Tensor types in C++ <a href="https://github.com/pytorch/pytorch/pull/28620">https://github.com/pytorch/pytorch/pull/28620</a></li></ul>

How new operators are authored

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