perl-Algorithm-RabinKarp

Rabin-Karp streaming hash

This is an implementation of Rabin and Karp's streaming hash, as described in "Winnowing: Local Algorithms for Document Fingerprinting" by Schleimer, Wilkerson, and Aiken. Following the suggestion of Schleimer, I am using their second equation: $H[ $c[2..$k + 1] ] = (( $H[ $c[1..$k] ] - $c[1] ** $k ) + $c[$k+1] ) * $k The results of this hash encodes information about the next k values in the stream (hense k-gram.) This means for any given stream of length n integer values (or characters), you will get back n - k + 1 hash values. For best results, you will want to create a code generator that filters your data to remove all unnecessary information. For example, in a large english document, you should probably remove all white space, as well as removing all capitalization.

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