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https://issues.apache.org/jira/browse/MAHOUT-399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jake Mannix updated MAHOUT-399:
-------------------------------
Attachment: 1000docs_26terms_5topics.jpg
So now I think I'm ready to start putting some patches up, because I've got a
unit test which lets you dynamically (not piles of files) create these kinds of
synthetic data sets, and verify convergence on them, giving you pretty pictures
like the attached (which was generated after running this against my GitHub
branch code).
> LDA on Mahout 0.3 does not converge to correct solution for overlapping
> pyramids toy problem.
> ---------------------------------------------------------------------------------------------
>
> Key: MAHOUT-399
> URL: https://issues.apache.org/jira/browse/MAHOUT-399
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 0.3, 0.4, 0.5
> Environment: Mac OS X 10.6.2, Hadoop 0.20.2, Mahout 0.3.
> Reporter: Michael Lazarus
> Assignee: Grant Ingersoll
> Labels: lda, mahout
> Fix For: 0.6
>
> Attachments: 1000docs_26terms_5topics.jpg, Overlapping Pyramids Toy
> Dataset.pdf, olt.tar
>
>
> Hello,
> Apologies if I have not labeled this correctly.
> I have run a toy problem on Mahout 0.3 (locally) for LDA that I used to test
> Blei's c version of LDA that he posts on his site. It has an exact solution
> that the LDA should converge to. Please see attached PDF that describes the
> intended output.
> Is LDA working? The following output indicates some sort of collapsing
> behavior to me.
> T0 T1 T2 T3 T4
> x w x u x
> u u g j n
> l r i m l
> j q h h p
> v p e i q
> e t f g v
> d s d f o
> b c b n k
> y f c l m
> w v u v u
> c d p y t
> k o l r r
> i b j k j
> f e k e f
> g x y s y
> t y w b w
> h i s p s
> o l v x d
> q j t d i
> n k o t b
> The intended output is (again, please see attached):
> D I N S X
> d i n s x
> c h m t y
> e j o r w
> b k l u v
> f g p q a
> a f k p b
> g l q v u
> h m j w t
> y u r o c
> n s d d i
> s e x f f
> r q i i n
> m v w c o
> o w u a h
> q n s h g
> p t c x d
> t x f e l
> x d e j s
> w y g b j
> i r y n r
> u o h y m
> k b t l e
> v c a m k
> j a b g p
> l p v k q
> What tests do you run to make sure the output is correct?
> Thank you,
> Mike.
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