Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/12938#discussion_r65418382
--- Diff: python/pyspark/ml/classification.py ---
@@ -157,10 +157,12 @@ def setThreshold(self, value):
@since("1.4.0")
def getThreshold(self):
"""
- Gets the value of threshold or attempt to convert thresholds to
threshold if set, or default
- value if neither are set.
- This conversion is equivalent to:
+ Get threshold for binary classification.
+
+ If :py:attr:`thresholds is set with length 2 (i.e., binary
classification),
+ this returns the equivalent threshold:
:math:`\\frac{1}{1 + \\frac{thresholds(0)}{thresholds(1)}}`.
+ Otherwise, returns :py:attr:`threshold` if set or its default
value.
--- End diff --
"... default value if unset."
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