Class Not Found from 0.8-SNAPSHOT for org.apache.lucene.analysis.WhitespaceAnalyzer

2013-05-07 Thread 万代豊
Hi all I guest I must've seen somewhere on very similar topics on classname change in Mahout-0.8-SNAPSHOT for some of the Lucene analyzer and here is another one that I need to be solved. Mahout gave me an error for seq2sparse with Lucene analyzer option as follows, which of cource had been

Re: Class Not Found from 0.8-SNAPSHOT for org.apache.lucene.analysis.WhitespaceAnalyzer

2013-05-07 Thread Suneel Marthi
It should be org.apache.lucene.analysis.core.WhitespaceAnalyzer ( u were missing the 'core') Mahout trunk's presently at Lucene 4.2.1. Lucene's has gone through a major refactor in 4.x. Check Lucene 4.2.1 docs for the correct package name. From: 万代豊

Re: Clustering product views and sales

2013-05-07 Thread Pat Ferrel
You always will have a cold start problem for a subset of users--the new ones to a site. Popularity doesn't always work either. Sometimes you have a flat purchase frequency distribution, as I've seen. In these cases a metadata or content based recommender is nice to fill in. If you have no

How to identify Clusters using KMeans

2013-05-07 Thread Karan
Hi All, I am doing clustering of some numerical data using KMeans algorithms(k=4). My data consists of 2 decimal values[X,Y], let's say XY and expecting them to be clustered into 4 clusters as LowX-LowY,LowX-HighY,HighX-LowY HighX-HighY. Though my 4 clusters are formed but I am unable to

Re: How to identify Clusters using KMeans

2013-05-07 Thread Matthew McClain
Karan, The clusters that come out of the KMeans algorithm won't necessarily fit the categories that you've defined. It all depends on the data. For example, the clusters could all be in a line (like at (6,6), (3,3), (-3, -3), and (-6, -6)), so there's no cluster that fits the description High

Question about evaluating a Recommender System

2013-05-07 Thread Zhongduo Lin
Hi All, I am using the Mahout to build a user-based recommender system (RS). The evaluation method I am using is AverageAbsoluteDifferenceRecommenderEvaluator, which according to the Mahout in Action randomly sets aside some existing preference and calculate the difference between the