Namespace Lucene.Net.Misc

Misc Tools

The misc package has various tools for splitting/merging indices, changing norms, finding high freq terms, and others.

Classes

GetTermInfo

Utility to get document frequency and total number of occurrences (sum of the tf for each doc) of a term.

LUCENENET specific: In the Java implementation, this class' Main method was intended to be called from the command line. However, in .NET a method within a DLL can't be directly called from the command line so we provide a .NET tool, lucene-cli, with a command that maps to that method: index list-term-info

HighFreqTerms

HighFreqTerms class extracts the top n most frequent terms (by document frequency) from an existing Lucene index and reports their document frequency.

LUCENENET specific: In the Java implementation, this class' Main method was intended to be called from the command line. However, in .NET a method within a DLL can't be directly called from the command line so we provide a .NET tool, lucene-cli, with a command that maps to that method: index list-high-freq-terms

HighFreqTerms.DocFreqComparer

Compares terms by DocFreq

HighFreqTerms.TotalTermFreqComparer

Compares terms by TotalTermFreq

IndexMergeTool

Merges indices specified on the command line into the index specified as the first command line argument.

LUCENENET specific: In the Java implementation, this class' Main method was intended to be called from the command line. However, in .NET a method within a DLL can't be directly called from the command line so we provide a .NET tool, lucene-cli, with a command that maps to that method: index merge

SweetSpotSimilarity

A similarity with a lengthNorm that provides for a "plateau" of equally good lengths, and tf helper functions.

For lengthNorm, A min/max can be specified to define the plateau of lengths that should all have a norm of 1.0. Below the min, and above the max the lengthNorm drops off in a sqrt function.

For tf, baselineTf and hyperbolicTf functions are provided, which subclasses can choose between.

TermStats

Holder for a term along with its statistics (DocFreq and TotalTermFreq).