I think the sentence could be worded a bit better.
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What is the difference between unsupervised and supervised learning that means that we know what the “right answer” is for supervised learning but not for unsupervised learning?
"
I suggest:
"
What is the difference between unsupervised and supervised learning which allows us to know the "right answer" in the supervised case?
"
I think the sentence could be worded a bit better.
"
What is the difference between unsupervised and supervised learning that means that we know what the “right answer” is for supervised learning but not for unsupervised learning?
"
I suggest:
"
What is the difference between unsupervised and supervised learning which allows us to know the "right answer" in the supervised case?
"