How Orange3 gets cosine value in Distances widget
Orange3 says that cosine of No.1 vector[1, 0] to No.2 vector[0, 1] is 1.000 and No.1 to No.7 vector[-1, 0] is 2.000 in Distance Matrix as below capture. I believe that it has to be 0.000 and -1.000 because it is supposed to be cosine. Or if it is radian, it has to be 1.5708(pi/2) and 3.1415(pi). Sounds like range of cosine is 0.0 to 2.0 in Orange3, but I've never told this before.
Does someone have any idea of this cosine results? Thank you.
Solution
What you describe is cosine similarity. Orange computes cosine distance.
The code is here: https://github.com/biolab/orange3/blob/master/Orange/distance/distance.py#L455.
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