TopK-1 CPU unittests

[J3698]

I am almost done implementing CPU TopK-1 and am passing the op tests I wrote. However it takes quite a while to write the unit tests, and I feel even if I spent another hour writing tests, I could be missing something.

So I'm thinking I should also write some additional randomized test cases in the folder unittest/cpu (which does not exist). I think this would be more exhaustive and take less time to write more tests. If this sounds okay I will start on it in a few days.

If it is also okay, I'd like to add an option to run one unit test at a time. I would change npm test unittest to npm test unittests, and add an npm test unittest [test], which only runs one unit test. If that is okay, I will also get started on that in the next couple of days.

Thanks!

[fs-eire]

Thanks for your contribution! Sorry for the late reply.

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