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From "Sambhav Kothari (BLOOMBERG/ LONDON)" <>
Subject Improvements to the Explanation class
Date Fri, 11 Jan 2019 14:17:43 GMT

Currently the Explanation class has a toHtml and 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 (

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 -

Just wanted to discuss this on the mailing list before creating Jira tickets.

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