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I asked "What is taller, a dog or a giraffe?" and it didn't know. Common sense is not yet in the knowledge graph. Maybe it can't perform comparisons

Also: "What is the largest city in Europe?" -> "New York City".

"What is the largest city in the world?" -> "Gotham City"

So it seems to make KB lookup errors and probably can't do logic/set operations.

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Correct, we can't do logic/set operations yet, but we can handle some graph traversal questions where the answer is the property of a n-off related entity like: (1) "Who is Arya Stark's father's wife?" or (2) "Mark Zuckerberg's wife's birthday"

I also tried things like:

How old is the French Prime-Minister? How old is the Portuguese President?

President always defaults to Trump and Prime-Minister to May (May also responds with two different results even though it show the same text(/source?). Also in Sapien "Prime-Minister" wasn't recognized.

I'm very excited about technologies like this one.

Yes, this is definitely a class of questions we don't do right now, but have updates coming for soon!

Good catch on "Prime-Minister", we will patch that.

Right now we think of Cortex as a competitor to Google KnowledgeGraph and WolframAlpha, rather than a common sense knowledge graph. But, we hope to answer questions like that one day :)

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