Frank McQuillan created MADLIB-1370:
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Summary: Knn in unsupervised mode not producing consistent results
Key: MADLIB-1370
URL: https://issues.apache.org/jira/browse/MADLIB-1370
Project: Apache MADlib
Issue Type: Bug
Components: k-NN
Reporter: Frank McQuillan
Fix For: v1.17
In unsupervised mode of knn
http://madlib.apache.org/docs/latest/group__grp__knn.html
when `point_source` and `test_source` are the same data set, nearest neighbors
is not reliably returning the 0 distance point as a nearest neighbor.
Could there a small neg issue here?
Also, please assess if we can add a vector of distances to the output file
{code}
Output Format
The output of the KNN module is a table with the following columns:
id INTEGER. The ids of test data points.
test_column_name DOUBLE PRECISION[]. The test data points.
prediction INTEGER. Label in case of classification, average value in case
of regression.
k_nearest_neighbours INTEGER[]. List of nearest neighbors, sorted closest to
furthest from the corresponding test point.
{code}
which could help trouble shoot this
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