I've added a bit more explanation here

http://wiki.opencog.org/w/URE_Configuration_Format#Usage

Nil

On 04/09/2017 10:04 PM, Linas Vepstas wrote:


On Sun, Apr 9, 2017 at 6:39 PM, Misgana Bayetta
<[email protected] <mailto:[email protected]>> wrote:



    On Sun, Apr 9, 2017 at 10:48 PM, Alex <[email protected]
    <mailto:[email protected]>> wrote:

        OK, I followed with updated tutorial
        
https://github.com/opencog/atomspace/tree/master/examples/rule-engine/chaining
        
<https://github.com/opencog/atomspace/tree/master/examples/rule-engine/chaining>
        and I managed to run my first cog-fc with the normal result. I
        would like to raise two points:

        1) tutorial says that cog-fc has 4 arguments, but my version of
        opencog (as or start of 2017) of cog-fc still has 3 arguments:
        source/rule base/focus set. There is no variable-declaration
        argument. Just wanted to note for those who use this thread for
        troubleshooting cog-fc.

        2) *I wonder about necessity of/_source_ /as an argument, why we
        need this? *Business Rule engines (like JBoss Drools) use entire
        Atomspace working memory as domain for reasoning - somehow first
        rule is selected and matched with facts and first inference is
        made and so this process continues? Focus set can be emtpy Set
        and then the entire Atomspace becomes the focus set. Maybe we
        can do this with source as well - maybe empty source will
        designed entire Atomspace as a source?


    Yes, you can pass empty SetLink. see here
    
https://github.com/opencog/atomspace/blob/master/opencog/rule-engine/forwardchainer/ForwardChainer.cc#L110
    
<https://github.com/opencog/atomspace/blob/master/opencog/rule-engine/forwardchainer/ForwardChainer.cc#L110>.


well, the wiki page, and the example/tutorial should point this out. Its
a good question.  I don't even know if we have a good wiki page
reviewing the forward chainer, how it works, how to use it?

--linas

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    Belachew Misgana Bayetta
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