Idf Enumeration

Idf Enumeration

Determines the calculation method Sphinx uses for the idf (Inverse Document Frequency).

Namespace: SphinxConnector.Common
Assembly: SphinxConnector (in SphinxConnector.dll) Version: 3.12.6

Syntax

public enum Idf

Public Enumeration Idf

Members

	Member name	Value	Description
	Normalized	0	BM25 variant, idf = log((N-n+1)/n), as per Robertson et al where N is the collection size and n is the number of matched documents.
	Plain	1	Plain variant, idf=log(N/n), as per Sparck-Jones where N is the collection size and n is the number of matched documents.

Remarks

Supported with Sphinx 2.1.1 and up.