By popular demand, I'm forwarding this email to the list... ben g
---------- Forwarded message ---------- From: Samir Araújo <[email protected]> Date: 2009/8/10 Subject: Coding an OpenCog implication for the robot to carry out a command like "Do Tai Chi" To: Troy Huang <[email protected]> Cc: Ben Goertzel <[email protected]> Hi Troy, in order to convert a sentence into a command, you will need to create an ImplicationLink that has in its preconditions a test to check the presence of the desired sentence into the AtomTable. i.e. ImplicationLink EvaluationLink *(preconditions. You can use an AndLink to evaluate more than one precondition)* PredicateNode:"actionDone" ListLink ExecutionLink GroundedSchemaNode:"say" ListLink AvatarNode:"RobotOwner" SentenceNode:"to:robot_id: *do tai chi*" ExecutionLink *(effect)* GroundedSchemaNode "tai_chi" ListLink (You can write ImpLinks directly in C++ or using a bind script language like Scheme) You must to pass, as an argument, the Handle of the defined ImpLink to the pattern match (opencog/query/PatternMatch::imply(Handle)).If the preconditions are satisfied, the PatternMatch will create the effect (in this case an ExecutionLink containing the schema that will execute the desired action) into the AtomTable and then it will return the handle of the execution link. Finally, you must to evaluate the returned ExecutionLink and then call the appropriate library to make the robot execute the action. If you're implementing the action procedure using Combo, for example, you will need to define a built-in Combo procedure (written in C++) and send the GroundedSchemaNode to Combo Procedure Interpreter to be executed. This process must be repeated every time a new sentence was said to the robot. Well, this is a very simplified description of the whole process. Obviously you will need to build an ImpLink that detects not only the presence of a SentenceNode into the AtomTable, but it must to detect what was the latest said sentence, who said, etc... So, if you send me more informations about how you're integrating OpenCog with the robot, I can help you to prepare the module that will evaluate the rules (ImpLinks) and execute the actions in the robot. (are you using Embodiment? are you using Relex to parse the said sentences? if you're not using relex, how the sentence comes from the proxy? etc...) Samir -- Ben Goertzel, PhD CEO, Novamente LLC and Biomind LLC Director of Research, SIAI [email protected] "Truth is a pathless land" -- Jiddu Krishnamurti
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