Tools for making explanations easier to consume/understand
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Key: LUCENE-3118
URL: https://issues.apache.org/jira/browse/LUCENE-3118
Project: Lucene - Java
Issue Type: Improvement
Reporter: Grant Ingersoll
Priority: Minor
Often times, reading Explanations (i.e. the breakdown of scores for a
particular query and result, say via Solr's &debugQuery) is a pretty cryptic
and hard to do undertaking. I often say people suffer from "explain blindness"
from staring at explanation results for too long. We could add a layer of
explanation helpers above the core Explain functionality that help people
understand better what is going on. The goal is to give a higher level of
tools to people who aren't necessarily well versed in all the underpinnings of
Lucene's scoring mechanisms but still want information about why something
didn't match
For instance (brainstorming some things that might be doable):
* Explain Diff Tool -- Given an 1 or more explanations, quickly highlight what
the key things are that differentiate the results (i.e. fieldNorm is higher,
etc.)
* Given a query and any document, give a more friendly reason why it ranks
lower than others without the need to have to parse through all the pieces of
the score, for instance, could you simply say something like, programatically
that is, this document scored lower compared to your top 10 b/c it had no
values in the foo Field.
* Could even maybe return codes for these reasons which could then be hooked
into actual user messages.
I don't have anything concrete patch-wise here, but am putting this up as a way
to capture the idea and potentially spur others to think about it.
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