[jira] [Assigned] (SPARK-23091) Incorrect unit test for approxQuantile
[ https://issues.apache.org/jira/browse/SPARK-23091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-23091: Assignee: Apache Spark > Incorrect unit test for approxQuantile > -- > > Key: SPARK-23091 > URL: https://issues.apache.org/jira/browse/SPARK-23091 > Project: Spark > Issue Type: Improvement > Components: ML, Tests >Affects Versions: 2.2.1 >Reporter: Kuang Chen >Assignee: Apache Spark >Priority: Minor > > Currently, test for `approxQuantile` (quantile estimation algorithm) checks > whether estimated quantile is within +- 2*`relativeError` from the true > quantile. See the code below: > [https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala#L157] > However, based on the original paper by Greenwald and Khanna, the estimated > quantile is guaranteed to be within +- `relativeError` from the true > quantile. Using the double "tolerance" is misleading and incorrect, and we > should fix it. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
[jira] [Assigned] (SPARK-23091) Incorrect unit test for approxQuantile
[ https://issues.apache.org/jira/browse/SPARK-23091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Apache Spark reassigned SPARK-23091: Assignee: (was: Apache Spark) > Incorrect unit test for approxQuantile > -- > > Key: SPARK-23091 > URL: https://issues.apache.org/jira/browse/SPARK-23091 > Project: Spark > Issue Type: Improvement > Components: ML, Tests >Affects Versions: 2.2.1 >Reporter: Kuang Chen >Priority: Minor > > Currently, test for `approxQuantile` (quantile estimation algorithm) checks > whether estimated quantile is within +- 2*`relativeError` from the true > quantile. See the code below: > [https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala#L157] > However, based on the original paper by Greenwald and Khanna, the estimated > quantile is guaranteed to be within +- `relativeError` from the true > quantile. Using the double "tolerance" is misleading and incorrect, and we > should fix it. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
