matpalm / Resemblance
Programming Languages
see "matpalm.com/resemblance":http://matpalm.com/resemblance for a proper walkthrough instructions here are more for replicating the results on the above project page
h1. measuring exact resemblance (jaccard coeff against shingles)
h2. ruby
run ruby version and output all with resemblance > 0.5
> cat test.data | ./ruby/shingle.rb coeff 0.5 > result
h2. cpp
run cpp version outputting resemblances above 0 (ie all of them)
outputs to N files generated from N cores so need to collate
> cat test.data | cpp/bin/Release/resemblance 0 > cat resemblance.*.out > result
h1. munging
h2. examine a result file
ie see phrases used for comparison rather than just raw result (eg 1 3 0.88)
> cat test.data | ./examine_result.rb result
h2. generate a histogram of resemblance values
> cat result | ./histo.rb | sort -n > histo.dat > ./plot_histo.sh histo.dat histo.100.png
h1. measuring resemblance (distance)
h2. ruby
> cat test.data | ./ruby/shingle.rb distance 0 > distances.original
h2. cpp
change the code, cause i havent yet (ie wip!)
h2. converting from distances to points
project distances into 2 dimensional space
then check mean square error for projected distances versus original distances
(similiarly change 2 to whatever dimensionality)
> cat distances.original | ./fastmap.rb 2 > points.2d > cat points.2d | ./convert_points_to_distances.rb > distances.projected.2d > ./mean_square_error.rb distances.original distances.projected.2d
plot 2d and 3d data with gnuplot
gnuplot> plot 'points.2d' with dots, 'points.2d' with labels gnuplot> splot 'points.3d' with dots, 'points.3d' with labels gnuplot> splot 'points.11d' with dots, 'points.11d' with labels # good luck with this one! ;)
h1. simhash heuristic
compare simhash to brute force order n squared compare all (considering only values above resemblance 0.5)
> cat test.data | ./ruby/shingle.rb coeff 0.5 | sort -nr -k3 > shingling.result > cat test.data | ./ruby/simhash.rb | sort -nr -k3 > simhash.result > ./compare.rb shingling.result simhash.result 0.5
h1. sketching heuristic
compare sketching to brute force order n squared compare all (considering only values above resemblance 0.5) use 64bit hash, calculate 10 shingles and cutoff at MAX/2
> cat test.data | ./ruby/shingle.rb coeff 0.5 | sort -nr -k3 > shingling.result > cat test.data | ./ruby/sketch.rb 64 10 2 | sort -nr -k3 > sketch.result > ./compare.rb shingling.result sketch.result 0.5
h1. sketching in erlang
> cd erl && rake > ln -s ../test.data . # todo: make path configurable > erl -noshell -pa erl/ebin -s main main > erl.result