Getting weights

[Jim Lindstrom]

I'm not seeing how to get the weights out of the network once I train
it. ... Help?

[sunder]

Jim,

Good question. There is a function in FANN that has that
information. I need to implement it on the ruby side of the world. I
haven't done any updates in a while, so this is probably as good a
time as any. I'll give you more details once it is in.

Thanks,
-Steven

[Jim Lindstrom]

Steven,

That'd be fantastic.  Thanks for the quick response time.  

In case anyone else finds it useful, I made a quick work around that relies on FANN's save-to-disk call.  (Not shown is how you figure out which connections belong to which neuron, but that's not too hard.)

class RubyFann::Standard

    # returns an array of { :src_node, :weight } elements

    def get_connections

        # ruby-fann doesn't let you get at the raw weights -- as far as I can tell.  So

        # this is a workaround that saves the network to a file and parses the weights out

        # of it.

        self.save("/tmp/test.fann")

        connections_str = `grep connections /tmp/test.fann`# read the saved network from file

        connections_str.gsub!(/.*=/,"")                    # get rid of some boilerplate at beginning of line

        connections = connections_str.split("(")           # turn string of repeated "(src_node, weight)" elements into an array

        connections.shift                                  # get rid of the bogus first element

        connections = connections.map { |x| x.split(",") } # split each (src_node, weight) pairs into an array

        connections = connections.map{ |x| { :src_node => Integer( x[0]                  ),

                                             :weight   => Float(   x[1].gsub(/\).*/, "") ) } }

        dummy = `rm /tmp/test.fann`

        return connections

    end

end

jbl

-- 
Jim Lindstrom
Email: jim.li...@gmail.com
Mobile: 773-339-4770
Twitter: @jimlindstrom

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