bm::xor_sim_params Struct Reference

Parameters for XOR similarity search. More...

#include <bmxor.h>

Public Member Functions
	xor_sim_params ()

Data Fields
unsigned	min_lookup_depth
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unsigned	max_lookup_depth
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unsigned	stop_gain
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float	target_gain_ratio
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unsigned	min_gaps
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Detailed Description

Parameters for XOR similarity search.

Tuneup params allows to reduce the search space to better balance compression rate vs speed.

min_lookup_depth - default: 0, minimal search depth to still try to improve max_lookup_depth - default: (2billion) maximum scan search Set a smaller number to improve search time

Example: min_lookup_depth = 64; max_lookup_depth = 1024;

stop_gain - default: 65533 - cutoff to stop search when serch found gain better than "stop_gain" absolute value Example: stop_gain = 10000;

target_gain_ratio - default: 0.89 - cut off ratio between original block cost metric and XOR basedd metric to stop searching. (90% better than the original block is "good enough") Example: target_gain_ratio = 0.50; // 50% improvement is good enough

min_gaps - default: 3 - minimal size of GAP block to be considered for XOR search candidate

Examples

rscsample05.cpp.

Definition at line 58 of file bmxor.h.

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The documentation for this struct was generated from the following file:

• bmxor.h