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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: Latent Semantic Analysis
Date Tue, 05 Jun 2012 08:21:36 GMT
LSA clustering with L_2 should be nearly the same as L_2 clustering in the
original because the point of SVD is to provide the projection that best
preserves L_2 distances.

On Mon, Jun 4, 2012 at 7:44 PM, Dmitriy Lyubimov <dlieu.7@gmail.com> wrote:

> RE: #2: I'd suggest to read LSA papers (Deerwester's, Dumais, they had
> more than one of them) to see how they address efficacy analysis of
> LSA there.
> SSVD is nothing but an SVD method, Mahout SVD's accuracy analysis is
> part of Nathan Halko's dissertation (linked to under "Papers" here:
>
> https://cwiki.apache.org/confluence/display/MAHOUT/Stochastic+Singular+Value+Decomposition
> ).
>
> RE:#1: I am not sure i read any work actually trying to figure
> clusters on LSA outputs. Which may just mean i didn't read enough on
> the topic. There's an eigenspokes value which pretty much is devoted
> to sphere-projected clusters produced by SVD on the social data, but i
> don't think they included LSA output in any of their claims. However,
> you may want to check that paper out. LSA is more about
> recall/precision/semantic distance hints (such as context-based
> polisemy) rather than topic clustering. However, *i think,* if
> there're any eigenspoke "clusters" in the LSA output, they better be
> projected on the sphere first in order to detect them more clearly.
> (see hyperspherical coordinates). I never did the latter so that's
> just my guess. check out the papers for more info.
>
> -d
>
>
>
> On Mon, Jun 4, 2012 at 12:11 AM, Peyman Mohajerian <mohajeri@gmail.com>
> wrote:
> > So now that LSA works but clustering of two newsgroups is not accurate
> > based on my subjective observation. I had two questions:
> > 1) Does it make sense to use Canopy before k-mean step to get a better
> idea
> > of the number of clusters or the output from SSVD can help in that
> regard?
> > Currently I pass the number of clusters as input parameter.
> > 2) What is a good way to assess the accuracy of the result, is there some
> > data set that is already clustered with certain tuning parameter that I
> can
> > use to gain some confidence? Using Newsgroups of different topics may not
> > be the best input since we aren't doing a regular clustering based on
> word
> > count.
> >
> > Thanks
> > Peyman
> >
> > On Fri, Apr 6, 2012 at 1:05 PM, Dmitriy Lyubimov <dlieu.7@gmail.com>
> wrote:
> >
> >> Ok, cool.
> >>
> >> I think writing MR output into your input folder is not a good
> >> practice in general in Hadoop world regardless of a job. Glad you had
> >> it resolved.
> >>
> >> On Fri, Apr 6, 2012 at 9:55 AM, Peyman Mohajerian <mohajeri@gmail.com>
> >> wrote:
> >> > Dmitriy,
> >> >
> >> > I did downgrade my hadoop and got the same error; however your last
> >> > suggestion worked, I moved the output path to a whole different
> directory
> >> > and this particular problem went away.
> >> >
> >> > Thanks Much,
> >> > Peyman
> >> >
> >> > On Thu, Apr 5, 2012 at 12:38 PM, Dmitriy Lyubimov <dlieu.7@gmail.com>
> >> wrote:
> >> >
> >> >> also i notice that you are using output as a subfolder of your input?
> >> >> if so, it is probably going to create some mess. If so, please don't
> >> >> use folders for input and output spec which are nested w.r.t. each
> >> >> other. This is not expected.
> >> >>
> >> >> -d
> >> >>
> >> >> On Thu, Apr 5, 2012 at 12:00 PM, Peyman Mohajerian <
> mohajeri@gmail.com>
> >> >> wrote:
> >> >> > Ok, great, I'll give these ideas a try later today, the input
is
> the
> >> >> > following line(s) that in my code sample was commented out using
> ';'
> >> in
> >> >> > Clojure.
> >> >> >  The first stage, Q-job is done fine, it is the second job that
> gets
> >> >> messed
> >> >> > up, the output of Q-job is at:
> >> >> > /lsa4solr/matrix/14099700861483/transpose-213/SSVD-out/Q-job and
> >> >> > /lsa4solr/matrix/14099700861483/transpose-213/SSVD-out/Q-job but
> >> BtJob is
> >> >> > looking for the input in the wrong place, it must be hadoop
> version as
> >> >> you
> >> >> > said.
> >> >> >
> >> >> > input path  #<Path
> >> >> > hdfs://localhost:9000/lsa4solr/matrix/15835804941333/transpose-120>
> >> >> > dd  #<Path[] [Lorg.apache.hadoop.fs.Path;@5563d208>
> >> >> > numCol  1000
> >> >> > numrow  15982
> >> >> >
> >> >> >
> >> >> > On Thu, Apr 5, 2012 at 11:54 AM, Dmitriy Lyubimov <
> dlieu.7@gmail.com>
> >> >> wrote:
> >> >> >
> >> >> >> Another idea i have is to try to run it from just Mahout command
> >> line,
> >> >> >> see if it works with .205. If it does, it is definitely something
> >> >> >> about passing parameters in/client hadoop classpath/ etc.
> >> >> >>
> >> >> >> On Thu, Apr 5, 2012 at 11:51 AM, Dmitriy Lyubimov <
> dlieu.7@gmail.com
> >> >
> >> >> >> wrote:
> >> >> >> > also you are printing your input path -- how does it
look like
> in
> >> >> >> > reality? because this path that it complains about,
> >> SSVDOutput/data,
> >> >> >> > in fact should be the input path. That's what's perplexing.
> >> >> >> >
> >> >> >> > We are talking hadoop job setup process here, nothing
specific
> to
> >> the
> >> >> >> > solution itself. And job setup/directory management fails
for
> some
> >> >> >> > reason.
> >> >> >> >
> >> >> >> > On Thu, Apr 5, 2012 at 11:45 AM, Dmitriy Lyubimov <
> >> dlieu.7@gmail.com>
> >> >> >> wrote:
> >> >> >> >> Any chance you could test it with its current dependency,
> >> 0.20.204?
> >> >> or
> >> >> >> >> that would be hard to stage?
> >> >> >> >>
> >> >> >> >> Newer hadoop version is frankly all i can think of
here for the
> >> >> reason
> >> >> >> of this.
> >> >> >> >>
> >> >> >> >> On Thu, Apr 5, 2012 at 11:35 AM, Peyman Mohajerian
<
> >> >> mohajeri@gmail.com>
> >> >> >> wrote:
> >> >> >> >>> Hi Dmitriy,
> >> >> >> >>>
> >> >> >> >>> It is a Clojure code from:
> >> https://github.com/algoriffic/lsa4solr
> >> >> >> >>> Of course I modified it to use Mahout .6 distribution,
also
> >> running
> >> >> on
> >> >> >> >>> hadoop-0.20.205.0, here is the Closure code that
I changed,
> >> >> >> >>> the lines after ' decomposer (doto (.run ssvdSolver))
' still
> >> need
> >> >> >> >>> modification b/c I'm not reading the eigenValue/Vector
from
> the
> >> >> solver
> >> >> >> >>> correctly.  Originally this code was based on
Mahout .4. I'm
> >> >> creating
> >> >> >> the
> >> >> >> >>> Matrix from Solr 3.1.0, very similar to what
was done on: '
> >> >> >> >>> https://github.com/algoriffic/lsa4solr'
> >> >> >> >>>
> >> >> >> >>> Thanks,
> >> >> >> >>>
> >> >> >> >>> (defn decompose-svd
> >> >> >> >>>  [mat k]
> >> >> >> >>>  ;(println "input path " (.getRowPath mat))
> >> >> >> >>>  ;(println "dd " (into-array [(.getRowPath mat)]))
> >> >> >> >>>  ;(println "numCol " (.numCols mat))
> >> >> >> >>>  ;(println "numrow " (.numRows mat))
> >> >> >> >>>  (let [eigenvalues (new java.util.ArrayList)
> >> >> >> >>>    eigenvectors (DenseMatrix. (+ k 2) (.numCols
mat))
> >> >> >> >>>    numCol (.numCols mat)
> >> >> >> >>>        config (.getConf mat)
> >> >> >> >>>    rawPath (.getRowPath mat)
> >> >> >> >>>    outputPath (Path. (str (.toString rawPath)
"/SSVD-out"))
> >> >> >> >>>    inputPath (into-array [rawPath])
> >> >> >> >>>    ssvdSolver (SSVDSolver. config inputPath outputPath
1000 k
> 60
> >> 3)
> >> >> >> >>>    decomposer (doto (.run ssvdSolver))
> >> >> >> >>>    V (normalize-matrix-columns (.viewPart (.transpose
> >> eigenvectors)
> >> >> >> >>>                           (int-array [0 0])
> >> >> >> >>>                           (int-array [(.numCols
mat) k])))
> >> >> >> >>>    U (mmult mat V)
> >> >> >> >>>    S (diag (take k (reverse eigenvalues)))]
> >> >> >> >>>    {:U U
> >> >> >> >>>     :S S
> >> >> >> >>>     :V V}))
> >> >> >> >>>
> >> >> >> >>>
> >> >> >> >>>
> >> >> >> >>>
> >> >> >> >>>
> >> >> >> >>> On Thu, Apr 5, 2012 at 11:10 AM, Dmitriy Lyubimov
<
> >> >> dlieu.7@gmail.com>
> >> >> >> wrote:
> >> >> >> >>>
> >> >> >> >>>> Yeah. i don't see how it may have arrived
at that error.
> >> >> >> >>>>
> >> >> >> >>>>
> >> >> >> >>>> Peyman,
> >> >> >> >>>>
> >> >> >> >>>> I need to know more -- it looks like you
are using embedded
> api,
> >> >> not a
> >> >> >> >>>> command line, so i need to see how you you
initialize the
> solver
> >> >> and
> >> >> >> >>>> also which version of Mahout libraries you
are using (your
> stack
> >> >> trace
> >> >> >> >>>> numbers do not correspond to anything reasonable
on current
> >> trunk).
> >> >> >> >>>>
> >> >> >> >>>> thanks.
> >> >> >> >>>>
> >> >> >> >>>> -d
> >> >> >> >>>>
> >> >> >> >>>> On Thu, Apr 5, 2012 at 10:55 AM, Dmitriy
Lyubimov <
> >> >> dlieu.7@gmail.com>
> >> >> >> >>>> wrote:
> >> >> >> >>>> > Hm. i never saw that and not sure where
this folder comes
> >> from.
> >> >> >> Which
> >> >> >> >>>> > hadoop version are you using? This may
be a result of
> >> >> incompatible
> >> >> >> >>>> > support for multiple outputs in the
newer hadoop versions
> . I
> >> >> tested
> >> >> >> >>>> > it with CDH3u0/u3 and it was fine. This
folder should
> normally
> >> >> >> appear
> >> >> >> >>>> > in the conversation, i suspect it is
an internal hadoop
> thing.
> >> >> >> >>>> >
> >> >> >> >>>> > This is without me actually looking
at the code per stack
> >> trace.
> >> >> >> >>>> >
> >> >> >> >>>> >
> >> >> >> >>>> > On Thu, Apr 5, 2012 at 5:22 AM, Peyman
Mohajerian <
> >> >> >> mohajeri@gmail.com>
> >> >> >> >>>> wrote:
> >> >> >> >>>> >> Hi Guys,
> >> >> >> >>>> >> I'm now using ssvd for my LSA code
and get the following
> >> error,
> >> >> at
> >> >> >> the
> >> >> >> >>>> time
> >> >> >> >>>> >> of error all I have under 'SSVD-out'
folder:
> >> >> >> >>>> >> Q-job/QHat-m-00000<
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> http://localhost:50075/browseDirectory.jsp?dir=%2Flsa4solr%2Fmatrix%2F14099700861483%2Ftranspose-213%2FSSVD-out%2FQ-job%2FQHat-m-00000&namenodeInfoPort=50070
> >> >> >> >>>> >&
> >> >> >> >>>> >> R-m-00000<
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> http://localhost:50075/browseDirectory.jsp?dir=%2Flsa4solr%2Fmatrix%2F14099700861483%2Ftranspose-213%2FSSVD-out%2FQ-job%2FR-m-00000&namenodeInfoPort=50070
> >> >> >> >>>> >&
> >> >> >> >>>> >> _SUCCESS<
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> http://localhost:50075/browseDirectory.jsp?dir=%2Flsa4solr%2Fmatrix%2F14099700861483%2Ftranspose-213%2FSSVD-out%2FQ-job%2F_SUCCESS&namenodeInfoPort=50070
> >> >> >> >>>> >&
> >> >> >> >>>> >> part-m-00000.deflate<
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> http://localhost:50075/browseDirectory.jsp?dir=%2Flsa4solr%2Fmatrix%2F14099700861483%2Ftranspose-213%2FSSVD-out%2FQ-job%2Fpart-m-00000.deflate&namenodeInfoPort=50070
> >> >> >> >>>> >
> >> >> >> >>>> >>
> >> >> >> >>>> >> I'm not clear where '/data' folder
is supposed to be set,
> is
> >> it
> >> >> >> part of
> >> >> >> >>>> the
> >> >> >> >>>> >> output of the QJob, I don't see
any error in the QJob*?
> >> >> >> >>>> >>
> >> >> >> >>>> >> *Thanks,*
> >> >> >> >>>> >> *
> >> >> >> >>>> >> SEVERE: java.io.FileNotFoundException:
File does not
> exist:
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> hdfs://localhost:9000/lsa4solr/matrix/15835804941333/transpose-120/SSVD-out/data
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:534)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:63)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:252)
> >> >> >> >>>> >>    at
> >> >> >> >>>>
> >> >> org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:954)
> >> >> >> >>>> >>    at
> >> >> >> org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:971)
> >> >> >> >>>> >>    at
> >> >> >> org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:172)
> >> >> >> >>>> >>    at
> >> >> org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:889)
> >> >> >> >>>> >>    at
> >> >> org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:842)
> >> >> >> >>>> >>    at java.security.AccessController.doPrivileged(Native
> >> Method)
> >> >> >> >>>> >>    at javax.security.auth.Subject.doAs(Subject.java:396)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >>
> >> org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:842)
> >> >> >> >>>> >>    at org.apache.hadoop.mapreduce.Job.submit(Job.java:465)
> >> >> >> >>>> >>    at
> >> >> >> >>>>
> >> >> org.apache.mahout.math.hadoop.stochasticsvd.BtJob.run(BtJob.java:505)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.mahout.math.hadoop.stochasticsvd.SSVDSolver.run(SSVDSolver.java:347)
> >> >> >> >>>> >>    at
> >> >> >> lsa4solr.mahout_matrix$decompose_svd.invoke(mahout_matrix.clj:188)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> lsa4solr.clustering_protocol$decompose_term_doc_matrix.invoke(clustering_protocol.clj:125)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> lsa4solr.clustering_protocol$cluster_kmeans_docs.invoke(clustering_protocol.clj:142)
> >> >> >> >>>> >>    at
> >> lsa4solr.cluster$cluster_dispatch.invoke(cluster.clj:72)
> >> >> >> >>>> >>    at lsa4solr.cluster$_cluster.invoke(cluster.clj:103)
> >> >> >> >>>> >>    at lsa4solr.cluster.LSAClusteringEngine.cluster(Unknown
> >> >> Source)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.solr.handler.clustering.ClusteringComponent.process(ClusteringComponent.java:91)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:194)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
> >> >> >> >>>> >>    at
> >> org.apache.solr.core.SolrCore.execute(SolrCore.java:1360)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
> >> >> >> >>>> >>    at
> >> >> >> >>>> >>
> >> >> >>
> >> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
> >> >> >> >>>> >>
> >> >> >> >>>> >> On Sun, Feb 26, 2012 at 4:56 PM,
Dmitriy Lyubimov <
> >> >> >> dlieu.7@gmail.com>
> >> >> >> >>>> wrote:
> >> >> >> >>>> >>
> >> >> >> >>>> >>> for the third time, in context
of lsa, faster and hence
> >> perhaps
> >> >> >> better
> >> >> >> >>>> >>> alternative to lanczos is ssvd.
Is there any specific
> reason
> >> >> you
> >> >> >> want
> >> >> >> >>>> >>> to use lanczos solver in context
of LSA?
> >> >> >> >>>> >>>
> >> >> >> >>>> >>> -d
> >> >> >> >>>> >>>
> >> >> >> >>>> >>> On Sun, Feb 26, 2012 at 6:40
AM, Peyman Mohajerian <
> >> >> >> mohajeri@gmail.com
> >> >> >> >>>> >
> >> >> >> >>>> >>> wrote:
> >> >> >> >>>> >>> > Hi Guys,
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> > Per you advice I did upgrade
to Mahout .6 and did a
> bunch
> >> of
> >> >> API
> >> >> >> >>>> >>> > changes and in the meantime
realized I had a bug with
> my
> >> >> input
> >> >> >> >>>> matrix,
> >> >> >> >>>> >>> > zero rows read from Solr
b/c multiple fields in Solr
> were
> >> >> index
> >> >> >> and
> >> >> >> >>>> >>> > not just the one I was
interested in, that issues is
> fixed
> >> >> and
> >> >> >> I have
> >> >> >> >>>> >>> > a matrix with these dimensions:
(.numCols mat) 1000
> >> (.numRows
> >> >> >> mat)
> >> >> >> >>>> >>> > 15932 (or the transpose)
> >> >> >> >>>> >>> > Unfortunately I'm getting
the below error now, in the
> >> context
> >> >> >> of some
> >> >> >> >>>> >>> > other Mahout algorithm
there was a mention of '/tmp' vs
> >> >> '/_tmp'
> >> >> >> >>>> >>> > causing this issue but
in this particular case the
> matrix
> >> is
> >> >> in
> >> >> >> >>>> >>> > memory!! I'm using this
google package: guava-r09.jar
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> > SEVERE: java.util.NoSuchElementException
> >> >> >> >>>> >>> >        at
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> com.google.common.collect.AbstractIterator.next(AbstractIterator.java:152)
> >> >> >> >>>> >>> >        at
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.mahout.math.hadoop.TimesSquaredJob.retrieveTimesSquaredOutputVector(TimesSquaredJob.java:190)
> >> >> >> >>>> >>> >        at
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.mahout.math.hadoop.DistributedRowMatrix.timesSquared(DistributedRowMatrix.java:238)
> >> >> >> >>>> >>> >        at
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver.solve(LanczosSolver.java:104)
> >> >> >> >>>> >>> >        at
> >> >> >> >>>> >>>
> >> >> lsa4solr.mahout_matrix$decompose_svd.invoke(mahout_matrix.clj:165)
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> > Any suggestion?
> >> >> >> >>>> >>> > Thanks,
> >> >> >> >>>> >>> > Peyman
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> >
> >> >> >> >>>> >>> > On Mon, Feb 20, 2012 at
10:38 AM, Dmitriy Lyubimov <
> >> >> >> >>>> dlieu.7@gmail.com>
> >> >> >> >>>> >>> wrote:
> >> >> >> >>>> >>> >> Peyman,
> >> >> >> >>>> >>> >>
> >> >> >> >>>> >>> >>
> >> >> >> >>>> >>> >> Yes, what Ted said.
Please take 0.6 release. Also try
> >> ssvd,
> >> >> it
> >> >> >> may
> >> >> >> >>>> >>> >> benefit you in some
regards compared to Lanczos.
> >> >> >> >>>> >>> >>
> >> >> >> >>>> >>> >> -d
> >> >> >> >>>> >>> >>
> >> >> >> >>>> >>> >> On Sun, Feb 19, 2012
at 10:34 AM, Peyman Mohajerian <
> >> >> >> >>>> mohajeri@gmail.com>
> >> >> >> >>>> >>> wrote:
> >> >> >> >>>> >>> >>> Hi Dmitriy &
Others,
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>> Dmitriy thanks
for your previous response.
> >> >> >> >>>> >>> >>> I have a follow
up question to my LSA project. I have
> >> >> managed
> >> >> >> to
> >> >> >> >>>> >>> >>> upload 1,500 documents
from two different news groups
> >> (one
> >> >> >> about
> >> >> >> >>>> >>> >>> graphics and one
about Atheism
> >> >> >> >>>> >>> >>> http://people.csail.mit.edu/jrennie/20Newsgroups/)
> to
> >> >> Solr.
> >> >> >> >>>> However my
> >> >> >> >>>> >>> >>> LanczosSolver in
Mahout.4 does not find any
> eigenvalues
> >> >> >> (there are
> >> >> >> >>>> >>> >>> eigenvectors as
you see in the follow up logs).
> >> >> >> >>>> >>> >>> The only things
I'm doing different from
> >> >> >> >>>> >>> >>> (https://github.com/algoriffic/lsa4solr)
is that I'm
> >> not
> >> >> >> using the
> >> >> >> >>>> >>> >>> 'Summary' field
but rather the actual 'text' field in
> >> Solr.
> >> >> >> I'm
> >> >> >> >>>> >>> >>> assuming the issue
is that Summary field already
> removes
> >> >> the
> >> >> >> noise
> >> >> >> >>>> and
> >> >> >> >>>> >>> >>> make the clustering
work and the raw index data does
> >> not do
> >> >> >> that,
> >> >> >> >>>> am I
> >> >> >> >>>> >>> >>> correct or there
are other potential explanations?
> For
> >> the
> >> >> >> desired
> >> >> >> >>>> >>> >>> rank I'm using
values between 10-100 and looking for
> >> >> #clusters
> >> >> >> >>>> between
> >> >> >> >>>> >>> >>> 2-10 (different
values for different trials), but
> always
> >> >> the
> >> >> >> same
> >> >> >> >>>> >>> >>> result comes out,
no clusters found.
> >> >> >> >>>> >>> >>> If my issue is
related to not having summarization
> done,
> >> >> how
> >> >> >> can
> >> >> >> >>>> that
> >> >> >> >>>> >>> >>> be done in Solr?
I wasn't able to fine a Summary
> field
> >> in
> >> >> >> Solr.
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>> Thanks
> >> >> >> >>>> >>> >>> Peyman
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Lanczos iteration
complete - now to diagonalize
> >> the
> >> >> >> >>>> tri-diagonal
> >> >> >> >>>> >>> >>> auxiliary matrix.
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
0 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
1 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
2 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
3 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
4 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
5 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
6 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
7 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
8 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
9 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: Eigenvector
10 found with eigenvalue 0.0
> >> >> >> >>>> >>> >>> Feb 19, 2012 3:25:20
AM
> >> >> >> >>>> >>> >>>
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver
> >> >> solve
> >> >> >> >>>> >>> >>> INFO: LanczosSolver
finished.
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>>
> >> >> >> >>>> >>> >>> On Sun, Jan 1,
2012 at 10:06 PM, Dmitriy Lyubimov <
> >> >> >> >>>> dlieu.7@gmail.com>
> >> >> >> >>>> >>> wrote:
> >> >> >> >>>> >>> >>>> In Mahout lsa
pipeline is possible with
> seqdirectory,
> >> >> >> seq2sparse
> >> >> >> >>>> and
> >> >> >> >>>> >>> ssvd
> >> >> >> >>>> >>> >>>> commands. Nuances
are understanding dictionary
> format
> >> and
> >> >> llr
> >> >> >> >>>> >>> anaylysis of
> >> >> >> >>>> >>> >>>> n-grams and
perhaps use a slightly better lemmatizer
> >> than
> >> >> the
> >> >> >> >>>> default
> >> >> >> >>>> >>> one.
> >> >> >> >>>> >>> >>>>
> >> >> >> >>>> >>> >>>> With indexing
part you are on your own at this
> point.
> >> >> >> >>>> >>> >>>> On Jan 1, 2012
2:28 PM, "Peyman Mohajerian" <
> >> >> >> mohajeri@gmail.com>
> >> >> >> >>>> >>> wrote:
> >> >> >> >>>> >>> >>>>
> >> >> >> >>>> >>> >>>>> Hi Guys,
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>> >>>>> I'm interested
in this work:
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
> http://www.ccri.com/blog/2010/4/2/latent-semantic-analysis-in-solr-using-clojure.html
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>> >>>>> I looked
at some of the comments and notices that
> >> there
> >> >> was
> >> >> >> >>>> interest
> >> >> >> >>>> >>> >>>>> in incorporating
it into Mahout, back in 2010. I'm
> >> also
> >> >> >> having
> >> >> >> >>>> issues
> >> >> >> >>>> >>> >>>>> running
this code due to dependencies on older
> >> version of
> >> >> >> Mahout.
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>> >>>>> I was wondering
if LSA is now directly available in
> >> >> Mahout?
> >> >> >> Also
> >> >> >> >>>> if I
> >> >> >> >>>> >>> >>>>> upgrade
to the latest Mahout would this Clojure
> code
> >> >> work?
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>> >>>>> Thanks
> >> >> >> >>>> >>> >>>>> Peyman
> >> >> >> >>>> >>> >>>>>
> >> >> >> >>>> >>>
> >> >> >> >>>>
> >> >> >>
> >> >>
> >>
>

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