The original lymphography dataset from UCI machine learning repository is a classification dataset. It is a multi-class dataset having four classes, but two of them are quite small (2 and 4 data records). Therefore, those two small classes are merged and considered as outliers compared to other two large classes (81 and 61 data records).
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Description: X = multi-dimensional point data, y = labels (1 = outliers, 0 = inliers)