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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Yes. I can't pass the tests because two elements are in different positions in various tests.
I saw someone trained a network and solved one puzzle kata.
In anycase, I don't think it is pre-installed(and if you're gonna download most probably it will timeout), so no.
Do you mean copy/paste C++ implmentation or tensorflow.js?