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Customized SymSpell SpellCheck Java

This customized spell check is is based on the spell correction fuzzy search library SymSpell with a few customizations and optimizations

Java Ported v6.6 (Bigrams)

SymSpell

Customizations

Keyboard based Qwerty/Qwertz Distance

There are 2 implementations of the keyboards one is English Qwerty based and other is German Qwertz based implementation we used the adjancey graph of the keyboard for the weights to the connected nodes.

Example

For 2 terms: 
        slices  
        olives

If the misspelled word is, slives 
both slices and olives is 1 edit distnace, 
  so in default case the one with higher frequency will end up in the result.
While with the qwerty based char distance,
 slives is more closer to slices.

The reason for this is in Qwerty Based Keyboard, 
 S and O are too far while V and C are adjacent.

Generation of Deletes

Word deletes are generated with taking edit distance which is minimum of max edit distance and 0.3 * word.length

Usage

Solr Usage

Accuracy Summary

Indexed Docs: 3695

Searches: 8060

Spellcorrection Strategy Accuracy Failures TP TN FP FN
LUCENE 78.96% 21.04% 5883 481 146 1550
Vanilla SymSpell 88.80% 11.20% 6888 269 358 545
Weighted SymSpell 75.74% 24.26% 5781 324 303 1652
Qwerty Vanilla SymSpell 88.57% 11.43% 6860 279 348 573
Qwerty Weighted SymSpell 75.36% 24.64% 5744 330 297 1689

Benchmark Summary

We have done 3 runs each for 30k and 80k data set, which also includes results for each verbosity level. After the runs the final benchmarking looks like:

Average Precalculation time instance 30843.33 ms
Average Lookup time instance 138141.09296296295 ns ~ 0.03814 ms
Total Lookup results instance 648092

More Detailed summary

Built With

Versioning

We use SemVer for versioning.

Nexus

Licenese

The MIT License (MIT)
Copyright © 2019 Lucky Sharma ( https://github.com/MighTguY/customized-symspell )
Copyright © 2018 Wolf Garbe (Original C# implementation https://github.com/wolfgarbe/SymSpell )

Permission is hereby granted, free of charge, to any person 
obtaining a copy of this software and associated documentation files
(the “Software”), to deal in the Software without restriction, 
including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is 
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall 
be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Special Mentions

Sachin Lala