jsmile DBN learning

[kalia_or]

Hi,

I saw the tutorials 6 & 7 on the wiki using SMILELearn in C++ to learn the parameters of DBN, is there any other library in java or I have to use SMILELearn in c++?
Furthermore, the textfile containing the DBN data should be in a specific format, like that: where A, B, C are the variable names that will be used in the network?

A A_0 A_1 B B_0 B_1 C C_0 C_1
t t t t t t t t t
t f f t f f t f f
f t f f t f f t f
f f f f f f f f f
t f t t f t t f t
t f f t f f t f f
f t f f t f f t f
f t t f t t f t t
t t t t t t t t t
t t t t t t t t t
t t t t t t t t t
t t f t t f t t f

Thanks in advance,

Kalia

[shooltz[BayesFusion]]

I saw the tutorials 6 & 7 on the wiki using SMILELearn in C++ to learn the parameters of DBN, is there any other library in java or I have to use SMILELearn in c++?

You can use jSMILE for learning, including EM parameter learning.

Furthermore, the textfile containing the DBN data should be in a specific format, like that: where A, B, C are the variable names that will be used in the network?

You can use any variable names in the text file. However, if you want to match the DBN with the data automatically via DataSet.matchNetwork, then you need to follow the "A, A_1, ..., B, B_1" convention. Note that order of the variables in the text file is not significant (so A, B, ..., A_1, B_1, ... will work as well).

[kalia_or]

Thank you for your help!
I have another question: What are the fixed nodes on EM - learning parameters of DBN?
Also, does EM work for Noisy-OR nodes as well?


Thanks,

Kalia

[shooltz[BayesFusion]]

I have another question: What are the fixed nodes on EM - learning parameters of DBN?

The parameters of the fixed nodes will not change during the EM learning.

Also, does EM work for Noisy-OR nodes as well?

EM will work with NoisyOR nodes, but not in DBNs.

[kalia_or]

Thank you so much for your help shooltz,

Is there any other learning algorithm or other way to learn the parameters of noisy-OR nodes for DBN?

[shooltz[BayesFusion]]

Is there any other learning algorithm or other way to learn the parameters of noisy-OR nodes for DBN?

No, at this point DBN parameter learning only works for general CPT nodes.