Sean Owen 79f5f281bb [SPARK-18678][ML] Skewed reservoir sampling in SamplingUtils ... ## What changes were proposed in this pull request? Fix reservoir sampling bias for small k. An off-by-one error meant that the probability of replacement was slightly too high -- k/(l-1) after l element instead of k/l, which matters for small k. ## How was this patch tested? Existing test plus new test case. Author: Sean Owen <sowen@cloudera.com> Closes #16129 from srowen/SPARK-18678.		2016-12-07 17:34:45 +08:00
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testthat	[SPARK-18678][ML] Skewed reservoir sampling in SamplingUtils	2016-12-07 17:34:45 +08:00