Hi,
I experiment with Taste's FileDataModel to get a simple file-based
example running. Getter methods are working, but getPreference() and
removePreference() throw java.lang.UnsupportedOperationExceptions. Do
I get something wrong here? Here is my test code:
File f = new File("input/data.csv");
logger.debug(f.canWrite()); // true
DataModel model = new FileDataModel(f);
logger.debug("items "+ model.getNumItems()); // 3
logger.debug("users "+ model.getNumUsers()); // 3
Object[] prefs = model.getPreferencesForItemAsArray("evolution");
logger.debug("prefs for evolution: "+prefs.length); // 1
model.setPreference("tom", "physics", new Double(0.1)); // THROWS
EXCEPTION
// model.removePreference("tom","evolution"); // THROWS EXCEPTION
java.lang.UnsupportedOperationException
at
org
.apache
.mahout
.cf
.taste.impl.model.file.FileDataModel.setPreference(FileDataModel.java:
322)
The content of input/data.csv is:
tom,evolution,1
anna,human,0
tim,biology,1
Thanks for your help! Mirko
