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Lextek Language Identifier
NORMALIZE
Name
NORMALIZE
Synopsis
Recomputes all hits for a term or subquery so that their weights fall between 0-1.
Arguments
Term or Subquery
Ranking Scheme
. The weights are recalculated by dividing each hit's weight by the RMS (root mean square) average of all the weights for the term. This RMS method of normalizing values is often found in physics or engineering. You take the average of the square of each weight. You then take the square root of that average.
Any resultant weights which would be larger than 1 are truncated to 1.
Comments
NORMALIZE is designed to help you put weights between 0 and 1. Typically this is done as the last step of your query when you have used weights that were larger than 1. This can occur when biasing terms to make them more relevant than terms which already had a weight of 1.
Example
NORMALIZE( 'blue' );
See Also
