Looking at the source answers this pretty directly: 3.0 is not a valid similarity since they must be in [-1,1].
On Tue, Dec 11, 2012 at 4:29 PM, Nick Katsipoulakis <[email protected]> wrote: > Dear list, > I am currently working on a project that involves exporting item > similarities from a database and writing them to a > file. I am using the FileItemSimilarity class in order to read the > similarities, but i get the following: > > Exception in thread "main" java.lang.IllegalArgumentException: Illegal > value: 3.0 > at > com.google.common.base.Preconditions.checkArgument(Preconditions.java:119) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity$ItemItemSimilarity.<init>(GenericItemSimilarity.java:264) > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemItemSimilarityIterator$1.apply(FileItemItemSimilarityIterator.java:48) > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemItemSimilarityIterator$1.apply(FileItemItemSimilarityIterator.java:44) > at com.google.common.collect.Iterators$9.transform(Iterators.java:845) > at > com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48) > at > com.google.common.collect.ForwardingIterator.next(ForwardingIterator.java:48) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity.initSimilarityMaps(GenericItemSimilarity.java:153) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity.<init>(GenericItemSimilarity.java:72) > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemSimilarity.reload(FileItemSimilarity.java:124) > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemSimilarity.<init>(FileItemSimilarity.java:94) > at > org.apache.mahout.cf.taste.impl.similarity.file.FileItemSimilarity.<init>(FileItemSimilarity.java:73) > at engineclient.EngineClient.main(EngineClient.java:35) > Java Result: 1 > > and the Java code that produces the above stack is: > > import java.io.File; > import javax.xml.namespace.QName; > import javax.xml.transform.Source; > import javax.xml.ws.Dispatch; > import javax.xml.transform.stream.StreamSource; > import javax.xml.ws.Service; > import java.io.StringReader; > import org.apache.mahout.cf.taste.impl.model.file.FileDataModel; > import org.apache.mahout.cf.taste.impl.similarity.file.FileItemSimilarity; > import org.apache.mahout.cf.taste.similarity.ItemSimilarity; > > public class EngineClient { > > public static void main(String[] args) throws Exception { > FileItemSimilarity simModel = new FileItemSimilarity(new > File("/home/administrator/Desktop/test_sim.csv")); > } > } > > I am working with Mahout version 0.8 SNAPSHOT. Any suggestions? > > Thank you
