Github user noel-smith commented on a diff in the pull request:
https://github.com/apache/spark/pull/8684#discussion_r39558391
--- Diff: python/pyspark/mllib/regression.py ---
@@ -571,8 +641,29 @@ def load(cls, sc, path):
class IsotonicRegression(object):
+ """
+ Isotonic regression.
+ Currently implemented using parallelized pool adjacent violators
algorithm.
+ Only univariate (single feature) algorithm supported.
+
+ Sequential PAV implementation based on:
+ Tibshirani, Ryan J., Holger Hoefling, and Robert Tibshirani.
+ "Nearly-isotonic regression." Technometrics 53.1 (2011): 54-61.
+ Available from
[[http://www.stat.cmu.edu/~ryantibs/papers/neariso.pdf]]
+
+ Sequential PAV parallelization based on:
+ Kearsley, Anthony J., Richard A. Tapia, and Michael W. Trosset.
+ "An approach to parallelizing isotonic regression."
+ Applied Mathematics and Parallel Computing. Physica-Verlag HD, 1996.
141-147.
+ Available from
[[http://softlib.rice.edu/pub/CRPC-TRs/reports/CRPC-TR96640.pdf]]
+
+ @see [[http://en.wikipedia.org/wiki/Isotonic_regression Isotonic
regression (Wikipedia)]]
+
+ .. addedversion:: 1.4.0
--- End diff --
Switch to `.. versionadded`
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