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Semantically related != meaningful.

Also, they do note that, "'Semantically related' is purposefully left vague."

I'm sorry, but "Semantics" is "the study of meaning" (at least according to Wikipedia). How's that possible that "Semantically related != meaningful"?

You left out a word - 'related'. Consider:

Tennis Playpen

Semantically related yes, meaningful no.

Then what is the point?

Or rather... Could I make a youtube comment classifier and enter it?

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