wordFrequencySimilarity function
Check similarity between 2 documents using word frequency metric
Default distanceFunction is cosineDistance
Implementation
double wordFrequencySimilarity(String document1, String document2,
{distanceFunction = cosineDistance,
String Function(String)? stemmer,
List<String>? stopwords}) {
List<List<double>> vectorList = wordFrequencyMatrix([document1, document2],
stemmer: stemmer, stopwords: stopwords);
return 1.0 - distanceFunction(vectorList[0], vectorList[1]);
}