I encounter few troubles with Mahout that I can't sort out.. The context is that I'm trying to calculate pairwise euclidean distances between music tracks based on 6 audio features per track. My input for the mahout job is a text file which looks like this:
feature_id,track_id,feature_value <integer>,< integer>,<double> This command works locally for less than 600 tracks (based on mahout-core-0.7-cdh4.5.0-job.jar): mahout itemsimilarity --input input/msd_sample/mahout --output output/mahout --similarityClassname SIMILARITY_EUCLIDEAN_DISTANCE --booleanData false --maxSimilaritiesPerItem 1 But for more tracks I get an empty file part-r-0000. I tried to decrease the --threshold parameter but I still don't have any result. I also tried to launch the job on aws EMR with the equivalent input for 3000 tracks (based on mahout-core-0.8-job.jar): org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJob --input s3n://hadoop-filrouge/input/msd-sample/mahout --output s3n://hadoop-filrouge/output/mahout/01202014-itemsimilarity --similarityClassname SIMILARITY_EUCLIDEAN_DISTANCE --booleanData false --maxSimilaritiesPerItem 1 The job runs successfully but I get 17 empty part-r-000xx.. I'm totally stuck right now and I'm running out of idea to fix this issue. So if anydody only have a little idea of what is going on, that could really help. Many thanks,
