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https://issues.apache.org/jira/browse/LUCENE-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13842194#comment-13842194
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Areek Zillur commented on LUCENE-5350:
--------------------------------------

The Benchmark results (similar format to LookupBenchmark results) were as 
follows:
{code}
-- input stats
Input size: 53022, numContexts: 2666, Avg. Input/Context: 20

-- construction time
AnalyzingSuggester input: 53022, time[ms]: 10140 [+- 149.13]
ContextAwareAnalyzingSuggester input: 53022, time[ms]: 1683 [+- 17.54]

-- RAM consumption
AnalyzingSuggester size[B]:    4,675,508
ContextAwareAnalyzingSuggester size[B]:    4,837,187

-- prefixes: 6-9, num: 7, onlyMorePopular: false
ContextAwareAnalyzingSuggester queries: 53022, time[ms]: 1277 [+- 14.67], 
~kQPS: 42
AnalyzingSuggester queries: 53022, time[ms]: 2269 [+- 152.00], ~kQPS: 23

-- prefixes: 2-4, num: 7, onlyMorePopular: false
ContextAwareAnalyzingSuggester queries: 53022, time[ms]: 2294 [+- 24.02], 
~kQPS: 23
AnalyzingSuggester queries: 53022, time[ms]: 4947 [+- 90.36], ~kQPS: 11

-- prefixes: 100-200, num: 7, onlyMorePopular: false
ContextAwareAnalyzingSuggester queries: 53022, time[ms]: 1177 [+- 32.13], 
~kQPS: 45
AnalyzingSuggester queries: 53022, time[ms]: 935 [+- 11.53], ~kQPS: 57
{code}

>From the results it seems
ContextAwaresuggester compared to AnalyzingSuggester: 
 -  is 6 times faster for construction
  - consumes ~3% more RAM
  - has ~ 2 times the QPS [for prefixes 6-9 & 2-4]
  - has 20% less QPS [for prefix 100-200]

It is to be noted that the dataset only contains terms with one context (hence 
the benchmark does not take into account terms with multiple contexts).

This was an interesting benchmark, thoughts?

> Add Context Aware Suggester
> ---------------------------
>
>                 Key: LUCENE-5350
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5350
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/search
>            Reporter: Areek Zillur
>             Fix For: 5.0, 4.7
>
>         Attachments: LUCENE-5350-benchmark.patch, LUCENE-5350.patch
>
>
> It would be nice to have a Context Aware Suggester (i.e. a suggester that 
> could return suggestions depending on some specified context(s)).
> Use-cases: 
>   - location-based suggestions:
>       -- returns suggestions which 'match' the context of a particular area
>           --- suggest restaurants names which are in Palo Alto (context -> 
> Palo Alto)
>   - category-based suggestions:
>       -- returns suggestions for items that are only in certain 
> categories/genres (contexts)
>           --- suggest movies that are of the genre sci-fi and adventure 
> (context -> [sci-fi, adventure])



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