LDA on Mahout 0.3 does not converge to correct solution for overlapping
pyramids toy problem.
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Key: MAHOUT-399
URL: https://issues.apache.org/jira/browse/MAHOUT-399
Project: Mahout
Issue Type: Bug
Components: Classification
Affects Versions: 0.3
Environment: Mac OS X 10.6.2, Hadoop 0.20.2, Mahout 0.3.
Reporter: Michael Lazarus
Priority: Critical
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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