Spellcheck
What is a spellchecker?
The spellchecker is an application that tells whether the given word is spelled correctly as per the language or not. If the word is not spelled correctly, the spellchecker often gives possible alternatives as suggestion to correct the misspelled word. The word can be spellchecked independently or in the context of a sentence. For example, in the sentence โเด เดธเตเดคเดฎเดฏเดธเตเดฐเตเดฏเตป เดเดเดฒเดฏเดฟเตฝ เดฎเตเดเตเดเดฟเดคเตเดคเดพเดดเตเดจเตเดจเตโ, the word โเดเดเดฒเดฏเดฟเตฝโ is spelled correctly if considered independently. But in the context of the sentence, it is supposed to be โเดเดเดฒเดฟเตฝโ.
The correctness of the word is tested by checking if that word is in the language model. The language model can be simply a list of all known words in the language. Or it can be a system which knows how a word in a language will look like and tell whether the given word is such a word. In the case of Malayalam, we saw that the finite dictionary is not possible. So we will need a system which is โawareโ of all words in the language. We will see how a morphology analyser can be such a system.
If the word is misspelled, the system need to give correction. To generate the correctly spelled words from a misspelled word form, an error model is needed. The most common error model is Levenshtein edit distance. In the edit distance algorithm, the misspelling is assumed to be a finite number of operations applied to characters of a string: deletion, insertion, change, or transposition. The number of operations is known as โedit distanceโ. Any word from the known list of words in the language, with a minimal distance is a candidate for suggestion. Peter Norvig explains such a functional spellchecker in his article :
There are multiple problems with the edit distance based correction mechanism
For a query word, to generate all candidates after applying the four operations, we can calculate the number of words we need to generate and test its correctness. For a word of length n, an alphabet size a, an edit distance d=1, there will be n deletions, n-1 transpositions, a*n alterations, and a*(n+1) insertions, for a total of 2n+2an+a-1 terms at search time. In the case of Malayalam, a is 117 if we consider all encoded characters in Unicode version 11. If we remove all archaic characters, we still need about 75 characters. So, for edit distance d=1, a=75, for a word with 10 characters, 2*10+2*75*10+75-1 = 1594 and much larger for larger d. So, you will need to do 1594 lookups(spellchecks) in the language model to get possible suggestions.
The concept that the 4 edit operations are the cause for all spelling mistakes is not accurate for Malayalam. There are many common spelling mistakes in Malayalam that are 3 or 4 edit distance from the original word. Usually the edit distance based corrections wonโt go beyond d=2 since the number of candidates increases.
The Standard Malayalam or lack thereof
How do you determine which is the โcorrectโ or โstandardโ way of writing a word? Malayalam has lot of orthographic variants for words which were introduced to language as genuine mistakes that later became common words(เดฐเดพเดชเตเดชเดเตฝ/เดฐเดพเดชเดเตฝ, เดเดฟเดฒเดตเต/เดเตเดฒเดตเต), phonetic simplification(เด เดฆเตเดงเตเดฏเดพเดชเดเตป/เด เดงเตเดฏเดพเดชเดเตป, เดธเตเดตเตผเดฃเตเดฃเด/เดธเตเดตเตผเดฃเด), or old spelling(เดเตผเดคเตเดคเดพเดตเต/เดเตเดคเตเดคเดพเดตเตเต) and so on. A debate about the correctness of these words will hardly reach conclusion. For our case, this is more of an issue of selecting words in the lexicon. Which one to include, which one to exclude? It is easy to consider these debates as blocker for the progress of the project and give up: โwell, these things are not decided by academics so far, so we cannot do anything about it till they make up their mindโ.
I did not want to end up in that deadlock. I decided to be liberal about the lexicon. If people are using some words commonly, they are valid words the project need to recognize as much as possible. That is the very liberal definition I have. I leave the standardization discussion to linguists who care about it.
Back in 2007, when I developed the old Malayalam spellchecker, these debates came up. Dr. P Somanathan, who helps me a lot now a days with this project, wrote about the issue of Malayalam spelling inconsistencies: โเดเดฐเดฟเดคเตเดฐเดคเตเดคเต เดตเตเดฃเตเดเตเดเตเดเตเดเตเด:โ and โเดตเตเดฃเด เดจเดฎเตเดเตเดเต เดเดเตเดเตเดคเดฎเดพเดฏ เดเดฐเตเดดเตเดคเตเดคเตเดฐเตเดคเดฟโ.
Context sensitive spellchecking
Usually the spellchecking and suggestion are done at one word at a time. But if we know the context of the word, the spellchecking will be further useful. The context is usually the words before and after the word. An example from English is โI am in Engineerโ. Here the word โinโ is a correct word, but with in the context, it is wrong. To mark the word โinโ wrong, and provide โanโ as suggestion, one approach is ngram model of part of speech for the language. In simple words, what kind of word can appear in between a known kind of words. If we build this model for a language, that will surely tell that the a locative POS โinโ before Engineer is rare or not seen before.
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