wordFrequencyMatrix function
Create word-vector matrix using word-frequency metric
Implementation
List<List<double>> wordFrequencyMatrix(List<String> documentList,
{String Function(String)? stemmer, List<String>? stopwords}) {
TokenizationOutput tokenOut =
documentTokenizer(documentList, stemmer: stemmer, stopwords: stopwords);
List<List<double>> matrix2d = List.generate(documentList.length, (_) => []);
//for all distinct words
tokenOut.bagOfWords.forEach((key, val) {
for (int i = 0; i < documentList.length; i++) {
if (tokenOut.documentBOW[i].containsKey(key)) {
matrix2d[i].add(tokenOut.documentBOW[i][key]!.toDouble());
} else {
matrix2d[i].add(0);
}
}
});
return matrix2d;
}