Mix [Obj,Double]

Description

Similar to the block Mix, but combines [OBJ,DOUBLE] tuples from several inputs into a single output. With the parameters several merging/aggregation-techniques can be selected. Most common scenario: if an object occurs in multiple inputs, it is an indication that this object is more relevant.

Input

• MIXLIST [OBJ,DOUBLE]: one or more inputs that should be combined

Output

• RESULT [OBJ,DOUBLE]: the combined output of all inputs

Parameters

• Input Score normalisation

  • None: don’t change probabilities as they come in

  • Max: divide by the maximum score in each input

  • Standard: performs standard score normalisation “combSUM score combination” (J.H.Lee, 1997)

• Score combination

  • Disjunctive: objects must occur in at least 1 input (default)

  • Conjunctive : objects must occur in all inputs

• Score aggregation: defines how the output scores are calculated (when an instance occurs in multiple inputs)

  • SUM: sums the weights of the individual inputs. Use SUM if the signals are completely independent (default)

  • MAX: selects the highest weight of the object. Often used in combination with Conjunctive.

  • MIN: selects the lowest weight of the object

  • PROD: multiplies of the individual inputs. Often used in combination with Conjunctive.

  • AVG: selects the average weight of the object (only over inputs that contain the input)

  • DISTINCT: aggregates evidence (formula: 1 - prod(1 - p))

  • ALL: don’t aggregate, and output all tuples from all inputs as is