public String strLabeling(File file){
		List<Sentence> obsvSeqs = dataReader.readFile(file.getPath());
		List lblSeqs = labeling(obsvSeqs);
		String ret = dataWriter.writeString(lblSeqs);
		return ret;
	}
public String strLabeling ( File file ) { List < Sentence > obsvSeqs = dataReader . readFile ( file . getPath ( ) ) ; List lblSeqs = labeling ( obsvSeqs ) ; String ret = dataWriter . writeString ( lblSeqs ) ; return ret ; }
labeling observation sequences.

@param file contains a list of observation sequence, this file has a format wich can be read by DataReader
@return string representing label sequences, the format is specified by writer