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( #3333=superdoc: print w/replies, xml ) Need Help??

So, you've got something like:

%nodes=( root => { parents => [], probs => [0.01]}, # P(root) some => { parents => ['n1'], probs => [0.74,0.21]}, # P(some|!root), P(some|root +) other =>{ parents => ['root','n1'], probs => [0.12,0.24, # P(other|!root,!some), P(ot +her|!root,some) 0.81,0.18]}, # P(other|root,!some), P(oth +er|root,some) );

I choose an array to represent the join probabilities because I thought it would be the easiest way. You get the entry you need with something like:

# the state you start from %state=(root=>1,some=>0); # let's get P(other|root,!some) $i=0; for @{$nodes{other}{parents}} { $i=($i<<2)+$state{$_} # this is a simple encoding. Just use the same +for updating and accessing } $prob=$nodes{other}{probs}[$i];

When you have trained your network, you can dump it using XML::Simple:

use XML::Simple; print XMLout(\%nodes);

I think this code should work as well with full-fledged belief networks, since I'm using names to refer to nodes, instead of nesting their representation in the XML tree.

        dakkar - Mobilis in mobile

In reply to Re: Re: Re: XML probabilistic trees by dakkar
in thread XML probabilistic trees by Anonymous Monk

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