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| haversine [2020/10/14 22:29] – prasanthi | haversine [2020/10/18 02:53] (current) – [link dump] prasanthi |
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| ==== scikit-learn functions ==== | ==== scikit-learn functions ==== |
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| | Documentation:- |
| | * https://scikit-learn.org/stable/modules/generated/sklearn.metrics.pairwise.haversine_distances.html |
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| | Code references:- |
| | * https://github.com/scikit-learn/scikit-learn/blob/master/sklearn/metrics/tests/test_pairwise.py -> test_haversine_distances() shows a sample call. This function also contains a slower implementation. Afterwards, compare the timings of the native scikit-learn function and its slower implementation. |
| | * https://github.com/scikit-learn/scikit-learn/blob/0.23.2/sklearn/metrics/pairwise.py -> haversine_distances() shows the implementation. |
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| | History:- |
| * The sklearn.metrics.pairwise.haversine_distances function was added in 0.21.0 | * The sklearn.metrics.pairwise.haversine_distances function was added in 0.21.0 |
| * The 0.21.0 was released on 2019-05 | * The 0.21.0 was released on 2019-05 |
| * https://scikit-learn.org/dev/whats_new/v0.21.html#id16 - changelog entry | * https://scikit-learn.org/dev/whats_new/v0.21.html#id16 - changelog entry |
| * https://scikit-learn.org/dev/whats_new/v0.21.html#version-0-21-0 - shows the release date | * https://scikit-learn.org/dev/whats_new/v0.21.html#version-0-21-0 - shows the release date |
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| | ==== link dump ==== |
| | * https://en.wikipedia.org/wiki/Haversine_formula |
| | * https://en.wikipedia.org/wiki/Great_circle - has a nice picture of the great circle (in the context of sphere). |
| | * https://en.wikipedia.org/wiki/Versine#Haversine - has a picture that shows how trigonometric functions can be constructed geometrically using unit circle. Contains a table of derivative and integral formulas for various types of versines. |
| | * http://rosettacode.org/wiki/Haversine_formula#Python - gives bare bones python code. In practice, we are probably better off using scikit-learn functions? |
| | * https://stackoverflow.com/questions/34557898/pairwise-haversine-distance-calculation - In practice, we are probably better off using scikit-learn functions. But the discussion, sample code here is probably useful? |
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