patch is posted as MAHOUT -786. also 0.6 trunk with patch applied is here : https://github.com/dlyubimov/mahout-commits/tree/MAHOUT-786
<https://github.com/dlyubimov/mahout-commits/tree/MAHOUT-786>I will commit to ASF repo tomorrow night (even that it is extremely simple, i need On Sat, Aug 13, 2011 at 1:48 PM, Eshwaran Vijaya Kumar < [email protected]> wrote: > Dmitriy, > That sounds great. I eagerly await the patch. > Thanks > Esh > On Aug 13, 2011, at 1:37 PM, Dmitriy Lyubimov wrote: > > > Ok, i got u0 working. > > > > The problem is of course that something called BBt job is to be coerced > to > > have 1 reducer (it's fine, every mapper won't yeld more than > > upper-triangular matrix of k+p x k+p geometry, so even if you end up > having > > thousands of them, reducer would sum them up just fine. > > > > it worked before apparently because configuration hold 1 reducer by > default > > if not set explicitly, i am not quite sure if that's something in hadoop > mr > > client or mahout change that now precludes it from working. > > > > anyway, i got a patch (really a one-liner) and an example equivalent to > > yours worked fine for me with 3 reducers. > > > > Also, in the tests, it also requests 3 reducers, but the reason it works > in > > tests and not in distributed mapred is because local mapred doesn't > support > > multiple reducers. I investigated this issue before and apparently there > > were a couple of patches floating around but for some reason those > changes > > did not take hold in cdh3u0. > > > > I will publish patch in a jira shortly and will commit it Sunday-ish. > > > > Thanks. > > -d > > > > > > On Fri, Aug 5, 2011 at 7:06 PM, Eshwaran Vijaya Kumar < > > [email protected]> wrote: > > > >> OK. So to add more info to this, I tried setting the number of reducers > to > >> 1 and now I don't get that particular error. The singular values and > left > >> and right singular vectors appear to be correct though (verified using > >> Matlab). > >> > >> On Aug 5, 2011, at 1:55 PM, Eshwaran Vijaya Kumar wrote: > >> > >>> All, > >>> I am trying to test Stochastic SVD and am facing some errors where it > >> would be great if someone could clarifying what is going on. I am > trying to > >> feed the solver a DistributedRowMatrix with the exact same parameters > that > >> the test in LocalSSVDSolverSparseSequentialTest uses, i.e, Generate a > 1000 > >> X 100 DRM with SequentialSparseVectors and then ask for blockHeight 251, > p > >> (oversampling) = 60, k (rank) = 40. I get the following error: > >>> > >>> Exception in thread "main" java.io.IOException: Unexpected overrun in > >> upper triangular matrix files > >>> at > >> > org.apache.mahout.math.hadoop.stochasticsvd.SSVDSolver.loadUpperTriangularMatrix(SSVDSolver.java:471) > >>> at > >> > org.apache.mahout.math.hadoop.stochasticsvd.SSVDSolver.run(SSVDSolver.java:268) > >>> at com.mozilla.SSVDCli.run(SSVDCli.java:89) > >>> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) > >>> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) > >>> at com.mozilla.SSVDCli.main(SSVDCli.java:129) > >>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > >>> at > >> > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > >>> at > >> > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > >>> at java.lang.reflect.Method.invoke(Method.java:597) > >>> at org.apache.hadoop.util.RunJar.main(RunJar.java:186) > >>> > >>> Also, I am using CDH3 with Mahout recompiled to work with CDH3 jars. > >>> > >>> Thanks > >>> Esh > >>> > >> > >> > >
