HeaRTDroid is a rule-based inference engine both for Android mobile devices, and desktop solutions
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pub:software:heartdroid:tutorials:uncertainty_cf [2017/01/04 12:35] admin [Use case] |
pub:software:heartdroid:tutorials:uncertainty_cf [2019/04/10 06:54] (current) |
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- | The certainty factors (CF) in XTT2 models can be assigned to the attributes' values, to rules conditions, and to the rules directly. | + | The certainty factors (CF) in XTT2 models can be assigned to three different elements: |
+ | - to the attributes' values -- this is usually done when the value is obtained from context-provier (sensor, user, etc.). This represents the confidence the value is correct. | ||
+ | - to rules conditions -- this is evaluated based on the CF of the attribute's value from the condition. The complete set of rules for how to evaluate the CF of conditional formula is given in: //Bobek S., Nalepa G. (2016). [[http://dx.doi.org/10.1016/j.pmcj.2016.09.004|Uncertainty handling in rule-based mobile context-aware systems]], Pervasive and Mobile Computing// | ||
+ | - to the rules directly -- this assignment is done by the knowledge engineer or machine learning methods. It represents the confidence of the rule itself being correct. | ||
+ | |||
You can see, that for instance table ''transportationModeA'' has rules which CF are lower than 1. | You can see, that for instance table ''transportationModeA'' has rules which CF are lower than 1. | ||
It means that the rules themselves are not completely certain and the resulting confidence of the conclusion they produce is not certain as well. | It means that the rules themselves are not completely certain and the resulting confidence of the conclusion they produce is not certain as well. |