[ https://issues.apache.org/jira/browse/LUCENE-8647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sambhav Kothari updated LUCENE-8647: ------------------------------------ Description: Initial proposal and discussion can be found here - [http://mail-archives.apache.org/mod_mbox/lucene-java-user/201901.mbox/%3CCADitDkmnv4Vup5VG2ZwLUOv5VM=itu-y8eugxxmtoppzpcy...@mail.gmail.com%3E] Currently the Explanation class has a toString method, but it doesn't seem to have any method to output the explanation as a NamedList. Part of the reason is that NamedList is a Solr only concept and it cannot exist in lucene. But this leads to utility functions like ([https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] and [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/util/SolrPluginUtils.java#L400-L466] which assume a particular structure about explanations. Explanation should instead have a toMap method which returns a Map of key-value pairs which can then be converted to a NamedList in Solr. This can be exceptionally useful if we have a class inheriting from Explanation that adds more attributes. For example for Learning to Rank model explanations we can have a ModelExplanation class which adds doc-specific feature scores and other machine learning model explanations to the output. It also allows the ExplainAugmenter and other classes to have a more generic way of getting an Explanation's data in a structured format. The way it currently does so is very ugly - [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] This also implies that we shouldn't keep Explanation as a final class anymore. Storing and parsing things like feature values in the explanation description doesn't seem like the right way. was: Initial proposal and discussion can be found here - [http://mail-archives.apache.org/mod_mbox/lucene-java-user/201901.mbox/%3CCADitDkmnv4Vup5VG2ZwLUOv5VM=itu-y8eugxxmtoppzpcy...@mail.gmail.com%3E] Currently the Explanation class has a toString method, but it doesn't seem to have any method to output the explanation as a NamedList. Part of the reason is that NamedList is a Solr only concept and it cannot exist in lucene. But this leads to utility functions like ([https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] and [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/util/SolrPluginUtils.java#L400-L466] which assume a particular structure about explanations. Explanation should instead have a toMap method which returns a Map of key-value pairs which can then be converted to a NamedList in Solr. This can be exceptionally useful if we have a class inheriting from Explanation that adds more attributes. For example for Learning to Rank model explanations we can have a ModelExplanation class which adds doc-specific feature scores and other machine learning model explanations to the output. It also allows the ExplainAugmenter and other classes to have a more generic way of getting an Explanation's data in a structured format. The way it currently does so is very ugly - [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] This also implies that we shouldn't keep Explanation as a final class anymore. Storing and parsing things in explanation description doesn't seem like the right way. > Create a generic method in the Explanation class to get explanation attributes > ------------------------------------------------------------------------------ > > Key: LUCENE-8647 > URL: https://issues.apache.org/jira/browse/LUCENE-8647 > Project: Lucene - Core > Issue Type: Improvement > Components: core/search > Affects Versions: 7.5 > Reporter: Sambhav Kothari > Priority: Minor > > Initial proposal and discussion can be found here - > > [http://mail-archives.apache.org/mod_mbox/lucene-java-user/201901.mbox/%3CCADitDkmnv4Vup5VG2ZwLUOv5VM=itu-y8eugxxmtoppzpcy...@mail.gmail.com%3E] > > Currently the Explanation class has a toString method, but it doesn't seem to > have any method to output the explanation as a NamedList. Part of the reason > is that NamedList is a Solr only concept and it cannot exist in lucene. But > this leads to utility functions like > ([https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] > and > [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/util/SolrPluginUtils.java#L400-L466] > which assume a particular structure about explanations. > > Explanation should instead have a toMap method which returns a Map of > key-value pairs which can then be converted to a NamedList in Solr. This can > be exceptionally useful if we have a class inheriting from Explanation that > adds more attributes. > > For example for Learning to Rank model explanations we can have a > ModelExplanation class which adds doc-specific feature scores and other > machine learning model explanations to the output. It also allows the > ExplainAugmenter and other classes to have a more generic way of getting an > Explanation's data in a structured format. > > The way it currently does so is very ugly - > [https://github.com/apache/lucene-solr/blob/1d85cd783863f75cea133fb9c452302214165a4d/solr/core/src/java/org/apache/solr/response/transform/ExplainAugmenterFactory.java#L115] > > This also implies that we shouldn't keep Explanation as a final class > anymore. Storing and parsing things like feature values in the explanation > description doesn't seem like the right way. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org