-------- Forwarding messages -------- From: chengji_zhaxn <[email protected]> Date: 2012-12-19 17:13:51 To: [email protected] Subject: Hello Sean, I have 2 questions about some of your algorithms model in the mahout src Hello Sean, This is Zha Chengji, I am a graduate major in School of Information and Communication Engeering, I come from Beijing University of Posts and Telecommunications, Beijing. Recently I am doing some KDD work in my lab with your fabulous mahout but unfortuntaly I have 2 questions about some of your algorithms model in the mahout src:mahout-distribution-0.6 Question 1: In the package, org.apache.mahout.clustering.kmeans of mahout-core, I find that the RandomSeedGenerator couldn't implement of generating the random seed. The test data, iris_konge.txt which is from UCI has 150 records. By using the RandomSeedGenerator, I can get only the most of the random seeds coming from the tail of the iris_kongge.txt. And the first 3 files of the enclosures, are my test data and result. The command I used in the Linux enviroment is hadoop jar org.apache.mahout.clustering.syntheticcontrol.kmeans.Job (running with default arguments), and k of k-means is 6. Question 2: In the package, org.apache.mahout.math.hadoop of mahout-core, I find that MatrixMultiplicationJob occassionally can't get the right result. And My testdata is in the tail of my enclosre, and its format is SequenceFile. I can breifly describe my question. The input matrix is as follows 1 0 0 0 1 0 1 1 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 0 1 But when input matrix multiplies itself, the result matrix is as follows 1 0 0 0 1 0 1 1 0 0 0 1 2 1 0 0 0 1 2 0 1 0 0 0 2 Obiviously, it is the wrong answer. I think very highly of the mahout and appreciate your big contirbution to the mahout. Thank you from my bottom of heart. I am looking forward to your reply. sincerely yours Zha Chengji(Kelvin) School of Information and Communication Engeering Beijing Universtiy of Posts and Telecommunications 2012-12-19 17:17 pm Beijing
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