Do the python numpy and sklearn trig functions use lookup tables to find the answers or do they try to compute values on-the-fly?

Asked May 09 '19 at 00:32

Active May 09 '19 at 00:32

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How are the values of trig functions like numpy.cos() computed? Are lookup tables used to speed the process or does it try to actually compute cosine on-the-fly to some level of accuracy? Is this the same for sklearn, like sklearn.metrics.pairwise.cosine_similarity() ?

asked May 09 '19 at 00:32

TheSneak

Possible duplicate of [How does C compute sin() and other math functions?](https://stackoverflow.com/questions/2284860/how-does-c-compute-sin-and-other-math-functions) – MB-F May 09 '19 at 07:53
Numpy uses C functions for such computations... For information on the C implementation see the duplicate link above. Sklearn usually uses numpy functions. However, in the particular case of `cosine_similarity` no trigonometric functions are ever computed. – MB-F May 09 '19 at 07:59

Do the python numpy and sklearn trig functions use lookup tables to find the answers or do they try to compute values on-the-fly?

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