Hi Mat, Thanks for pointing out link for JIRA for this particular case.
Could you extend one more help: I have not used maven for building and running java classes. I am looking at http://maven.apache.org/guides/getting-started/index.html Could you please point out how to build & run any specific class like OnlineLogisticRegressionTest.java from mahout. Thanks Rajesh On Wed, Oct 31, 2012 at 8:15 PM, Mat Kelcey <[email protected]>wrote: > Rajesh, Ted has added the test case code already > https://issues.apache.org/jira/browse/MAHOUT-1107 > > On 31 October 2012 05:14, Rajesh Nikam <[email protected]> wrote: > > > Hi Ted, > > > > Please update once JIRA and test case is uploaded. > > > > Looking forward for your reply. > > > > Thanks > > Rajesh > > > > On Wed, Oct 31, 2012 at 11:00 AM, Rajesh Nikam <[email protected] > > >wrote: > > > > > Hi Ted, > > > > > > Thanks for reply. I will wait for JIRA and hope to get rid of any > > encoding > > > issue. > > > > > > Thanks, > > > Rajesh > > > On Oct 31, 2012 5:24 AM, "Ted Dunning" <[email protected]> wrote: > > > > > >> OK. I am back up for air. > > >> > > >> Rajesh, > > >> > > >> As I am sure you know, most folks here contribute on their own time. > I > > >> have been busy with my day job and unable to help with this until just > > >> now. > > >> > > >> I just wrote a test case that looks at the Iris data set. The results > > are > > >> categorically different from yours. > > >> > > >> That substantiates my original feeling that your encoding of the data > is > > >> problematic. I will file a JIRA and attach a test case that you can > > look > > >> at. Then we can see what the differences are. > > >> > > >> > > >> On Tue, Oct 23, 2012 at 1:28 AM, Rajesh Nikam <[email protected]> > > >> wrote: > > >> > > >> > Hi, > > >> > > > >> > Is there development happening on fixing issue with SGD that > generates > > >> > models which are as good as random prediction? > > >> > > > >> > I am not sure why such issue is not noticed and raised by others ? > > >> > May be this specific algo is not used in practical applications. > > >> > > > >> > Thanks, > > >> > Rajesh > > >> > > > >> > > > >> > >> > > >> > >> On Tue, Oct 16, 2012 at 10:23 PM, Ted Dunning < > > [email protected] > > >> > >wrote: > > >> > >> > > >> > >>> Rajesh, > > >> > >>> > > >> > >>> In the testing that I did, I ran 100, 1000 and 10,000 passes > > through > > >> > the > > >> > >>> data. All produced identical results. Thus it isn't an issue > of > > >> SGD > > >> > >>> converging. > > >> > >>> > > >> > >>> I also did a parameter scan of lambda and saw no effect. > > >> > >>> > > >> > >>> I also did the standard thing in R with glm and got the expected > > >> > >>> (correct) > > >> > >>> results. > > >> > >>> > > >> > >>> I haven't looked yet in detail, but I really suspect that the > > >> reading > > >> > of > > >> > >>> the data is horked. This is exactly how that behaves. > > >> > >>> > > >> > >>> On Tue, Oct 16, 2012 at 4:49 AM, Rajesh Nikam < > > >> [email protected]> > > >> > >>> wrote: > > >> > >>> > > >> > >>> > Hi Ted, > > >> > >>> > > > >> > >>> > I was thinking, this might be due to having only 100 instances > > for > > >> > >>> > training. > > >> > >>> > > > >> > >>> > So I have created test set with two classes having ~49K > > instances, > > >> > >>> included > > >> > >>> > all features as predictors. > > >> > >>> > PFA sgd.grps.zip with test file. > > >> > >>> > > > >> > >>> > mahout trainlogistic --input > > >> /usr/local/mahout/trainme/sgd-grps.csv > > >> > >>> > --output /usr/local/mahout/trainme/sgd-grps.model --target > class > > >> > >>> > --categories 2 --features 128 --types n --predictors a1 a2 a3 > a4 > > >> a5 > > >> > a6 > > >> > >>> a7 > > >> > >>> > a8 a9 a10 a11 a12 a13 a14 a15 a16 a17 a18 a19 a20 a21 a22 a23 > > a24 > > >> a25 > > >> > >>> a26 > > >> > >>> > a27 a28 a29 a30 a31 a32 a33 a34 a35 a36 a37 a38 a39 a40 a41 > a42 > > >> a43 > > >> > >>> a44 a45 > > >> > >>> > a46 a47 a48 a49 a50 a51 a52 a53 a54 a55 a56 a57 a58 a59 a60 > a61 > > >> a62 > > >> > >>> a63 a64 > > >> > >>> > a65 a66 a67 a68 a69 a70 a71 a72 a73 a74 a75 a76 a77 a78 a79 > a80 > > >> a81 > > >> > >>> a82 a83 > > >> > >>> > a84 a85 a86 a87 a88 a89 a90 a91 a92 a93 a94 a95 a96 a97 a98 > a99 > > >> a100 > > >> > >>> a101 > > >> > >>> > a102 a103 a104 a105 a106 a107 a108 a109 a110 a111 a112 a113 > a114 > > >> a115 > > >> > >>> a116 > > >> > >>> > a117 a118 a119 a120 a121 a122 a123 a124 a125 a126 a127 > > >> > >>> > > > >> > >>> > > > >> > >>> > mahout runlogistic --input > > /usr/local/mahout/trainme/sgd-grps.csv > > >> > >>> --model > > >> > >>> > /usr/local/mahout/trainme/sgd-grps.model --auc --confusion > > >> > >>> > > > >> > >>> > Still the results are similar, it classifies everything as > > >> class_1. > > >> > >>> > > > >> > >>> > AUC = 0.50 > > >> > >>> > confusion: [[*26563.0, 23006.0*], [0.0, 0.0]] > > >> > >>> > entropy: [[-0.0, -0.0], [-46.1, -21.4]] > > >> > >>> > > > >> > >>> > I am not sure why this is failing all the time. > > >> > >>> > > > >> > >>> > Looking forward for your reply. > > >> > >>> > > > >> > >>> > Thanks > > >> > >>> > Rajesh > > >> > >>> > > > >> > >>> > > > >> > >>> > > > >> > >>> > On Tue, Oct 16, 2012 at 3:57 AM, Ted Dunning < > > >> [email protected]> > > >> > >>> > wrote: > > >> > >>> > > > >> > >>> > > I would love to help and will before long. Just can't do it > > in > > >> the > > >> > >>> first > > >> > >>> > > part of this week. > > >> > >>> > > > > >> > >>> > > On Mon, Oct 15, 2012 at 6:28 AM, Rajesh Nikam < > > >> > [email protected] > > >> > >>> > > > >> > >>> > > wrote: > > >> > >>> > > > > >> > >>> > > > Hello, > > >> > >>> > > > > > >> > >>> > > > I have asked below question on issue with using sgd on > > mahout > > >> > >>> forum. > > >> > >>> > > > > > >> > >>> > > > Similar issue with sgd is reported by > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > > >> > >>> > > > >> > >>> > > >> > > > >> > > > http://stackoverflow.com/questions/11221436/using-sgd-classifier-in-mahout > > >> > >>> > > > > > >> > >>> > > > Even below link has similar output: > > >> > >>> > > > > > >> > >>> > > > AUC = 0.57*confusion: [[27.0, 13.0], [0.0, 0.0]]* > > >> > >>> > > > entropy: [[-0.4, -0.3], [-1.2, -0.7]] > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > >> > >>> > > >> > > > http://sujitpal.blogspot.in/2012/09/learning-mahout-classification.html > > >> > >>> > > > > > >> > >>> > > > I am still wannder confusion how then this model works and > > >> used > > >> > by > > >> > >>> > many ? > > >> > >>> > > > Not able to get any points on how to use SGD that > generates > > >> > >>> effective > > >> > >>> > > > model. > > >> > >>> > > > > > >> > >>> > > > Could someone point out what is missing in input file or > > >> provided > > >> > >>> > > > parameters. > > >> > >>> > > > > > >> > >>> > > > I appreciate your help. > > >> > >>> > > > > > >> > >>> > > > Below is description of steps that I followed. > > >> > >>> > > > > > >> > >>> > > > PF Attached uses input files for experiment. > > >> > >>> > > > > > >> > >>> > > > I am using Iris Plants Database from Michael Marshall. PFA > > >> > >>> iris.arff. > > >> > >>> > > > Converted this to csv file just by updating header: > > >> > >>> iris-3-classes.csv > > >> > >>> > > > > > >> > >>> > > > mahout org.apache.mahout.classifier. > > >> > >>> > > > sgd.TrainLogistic --input > > >> > >>> > > /usr/local/mahout/trunk/*iris-3-classes.csv*--features 4 > > >> --output > > >> > >>> > > /usr/local/mahout/trunk/ > > >> > >>> > > > *iris-3-classes.model* --target class *--categories 3* > > >> > --predictors > > >> > >>> > > > sepallength sepalwidth petallength petalwidth --types n > > >> > >>> > > > > > >> > >>> > > > >> it gave following error. > > >> > >>> > > > Exception in thread "main" > > java.lang.IllegalArgumentException: > > >> > Can > > >> > >>> only > > >> > >>> > > > call classifyScalar with two categories > > >> > >>> > > > > > >> > >>> > > > Now created csv with only 2 classes. PFA > iris-2-classes.csv > > >> > >>> > > > > > >> > >>> > > > >> trained iris-2-classes.csv with sgd > > >> > >>> > > > > > >> > >>> > > > mahout org.apache.mahout.classifier.sgd.TrainLogistic > > --input > > >> > >>> > > > /usr/local/mahout/trunk/*iris-2-classes.csv* --features 4 > > >> > --output > > >> > >>> > > > /usr/local/mahout/trunk/*iris-2-classes.mode*l --target > > class > > >> > >>> > > *--categories > > >> > >>> > > > 2* --predictors sepallength sepalwidth petallength > > petalwidth > > >> > >>> --types n > > >> > >>> > > > > > >> > >>> > > > mahout runlogistic --input > > >> > >>> /usr/local/mahout/trunk/iris-2-classes.csv > > >> > >>> > > > --model /usr/local/mahout/trunk/iris-2-classes.model --auc > > >> > >>> --confusion > > >> > >>> > > > > > >> > >>> > > > AUC = 0.14 > > >> > >>> > > > confusion: [[50.0, 50.0], [0.0, 0.0]] > > >> > >>> > > > entropy: [[-0.6, -0.3], [-0.8, -0.4]] > > >> > >>> > > > > > >> > >>> > > > >> AUC seems to poor. Now changed --predictors > > >> > >>> > > > > > >> > >>> > > > mahout org.apache.mahout.classifier.sgd.TrainLogistic > > --input > > >> > >>> > > > /usr/local/mahout/trunk/*iris-2-classes.csv* --features 4 > > >> > --output > > >> > >>> > > > /usr/local/mahout/trunk/*iris-2-classes.mode*l --target > > class > > >> > >>> > > *--categories > > >> > >>> > > > 2* --predictors sepalwidth petallength --types n > > >> > >>> > > > > > >> > >>> > > > mahout runlogistic --input > > >> > >>> /usr/local/mahout/trunk/iris-2-classes.csv > > >> > >>> > > > --model /usr/local/mahout/trunk/iris-2-classes.model --auc > > >> > >>> --confusion > > >> > >>> > > > --scores > > >> > >>> > > > > > >> > >>> > > > AUC = 0.80 > > >> > >>> > > > *confusion: [[50.0, 50.0], [0.0, 0.0]]* > > >> > >>> > > > entropy: [[-0.7, -0.3], [-0.7, -0.4]] > > >> > >>> > > > > > >> > >>> > > > This model classifies everything as category 1 which of no > > >> use. > > >> > >>> > > > > > >> > >>> > > > Thanks > > >> > >>> > > > Rajesh > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > > > >> > >>> > > > > >> > >>> > > > >> > >>> > > >> > >> > > >> > >> > > >> > > > > >> > > > >> > > > > > >
