How to detect the dominant language of a text word?

Question

It's looks good for string but it's not working for me for a word . I am working with search as per as my requirement when user typing any 3 character in the meantime looking to check which language user typing. if I think it should not work with detec0t word but i expect it should be working with Islam word.

let tagger = NSLinguisticTagger(tagSchemes:[.tokenType, .language, .lexicalClass, .nameType, .lemma], options: 0)

func determineLanguage(for text: String) {
    tagger.string = text
    let language = tagger.dominantLanguage
    print("The language is \(language!)")
}


//Test case
determineLanguage(for: "I love Islam") // en -pass
determineLanguage(for: "আমি ইসলাম ভালোবাসি") // bn -pass
determineLanguage(for: "أنا أحب الإسلام") // ar -pass
determineLanguage(for: "Islam") // und - failed

Result:

The language is en
The language is bn
The language is ar
The language is und

What I missed for "Unknown language"

Answer 1

Simply because it belongs to too many languages and it would be unrealistic to guess the language based on one word. The context always helps.

For example :

import NaturalLanguage

let recognizer = NLLanguageRecognizer()
recognizer.processString("Islam")
print(recognizer.dominantLanguage!.rawValue)  //Force unwrapping for brevity

prints tr , which stands for Turkish. It's an educated guess.

If you want the other languages that were also possible, you could use languageHypotheses(withMaximum:) :

let hypotheses = recognizer.languageHypotheses(withMaximum: 10)

for (lang, confidence) in hypotheses.sorted(by: { $0.value > $1.value }) {
    print(lang.rawValue, confidence)
}

Which prints

 tr 0.2332388460636139 //Turkish hr 0.1371040642261505 //Croatian en 0.12280254065990448 //English pt 0.08051242679357529 de 0.06824589520692825 nl 0.05405258387327194 nb 0.050924140959978104 it 0.037797268480062485 pl 0.03097432479262352 hu 0.0288708433508873 

Now you could define an acceptable threshold of confidence in order to accept that result.

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^{Language codes can be found here}