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package Set::Similarity::BV; |
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2780
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use strict; |
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156
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use warnings; |
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237
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6
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our $VERSION = '0.05'; |
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36
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use Carp 'croak'; |
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370
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3765
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use Data::Dumper; |
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31944
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1030
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our $width = int 0.999+log(~0)/log(2); |
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sub new { |
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1
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1513
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my $class = shift; |
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# uncoverable condition false |
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100
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bless @_ ? @_ > 1 ? {@_} : {%{$_[0]}} : {}, ref $class || $class; |
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100
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} |
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sub similarity { |
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1
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6382
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my ($self, $hex1, $hex2) = @_; |
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100
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100
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219
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return 1 if (!($hex1 || $hex2)); # both zero |
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100
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100
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243
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return 0 unless ($hex1 && $hex2); # one is zero |
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#return 1 if (!(hex($hex1) || hex($hex2))); # both zero |
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#return 0 unless (hex($hex1) && hex($hex2) ); # one is zero |
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no warnings 'portable'; # for 0xffffffffffffffff |
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660
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80
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return $self->from_integers( |
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$self->_integers($hex1), |
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$self->_integers($hex2), |
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); |
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} |
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1
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sub from_integers { croak 'Method "from_integers" not implemented in subclass' } |
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40
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sub intersection { |
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1
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my ($self,$v1,$v2) = @_; |
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5
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no warnings 'portable'; # for 0xffffffffffffffff |
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5
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989
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45
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my $bits = 0; |
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my $max1 = scalar(@{$v1}) - 1; |
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my $max2 = scalar(@{$v2}) - 1; |
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for (my $i=0; ($i <= $max1) && ($i <= $max2); $i++) { |
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$bits += $self->bits([ ($v1->[$i] & $v2->[$i]) ]); |
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} |
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return $bits; |
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} |
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sub _integers { |
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85
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my ($self,$hex_string) = @_; |
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58
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110
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my $chunk_size = int($width/4); |
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my @chunks = $hex_string =~ m/([0-9a-f]{1,$chunk_size})/gi; |
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61
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5
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32
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no warnings 'portable'; # for 0xffffffffffffffff |
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8
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5
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553
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62
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94
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my $result = []; |
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95
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for my $chunk (@chunks) { |
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71
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push @{$result},hex($chunk); |
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183
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} |
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62
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241
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return $result; |
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} |
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69
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sub bits { |
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87
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87
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1
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104
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my ($self,$array_of_integers) = @_; |
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72
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5
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5
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2968
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use integer; |
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5
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49
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5
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20
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73
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5
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5
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160
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no warnings 'portable'; # for 0xffffffffffffffff |
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5
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8
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5
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991
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74
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75
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# (bytesof($v) -1) * bitsofbyte = (8-1)*8 = 56 # for 64 bit |
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# (bytesof($v) -1) * bitsofbyte = (8-1)*8 = 56 # for 32 bit |
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87
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104
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my $final_shift = (($width/8) - 1) * 8; |
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79
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87
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my $bits = 0; |
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87
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64
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for my $i (@{$array_of_integers}) { |
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133
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81
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90
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my $v = $i; # don't use (and change) $i directly |
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95
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$v = $v - (($v >> 1) & 0x5555555555555555); |
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$v = ($v & 0x3333333333333333) + (($v >> 2) & 0x3333333333333333); |
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# (bytesof($v) -1) * bitsofbyte = (8-1)*8 = 56 ----------------------vv |
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$v = (($v + ($v >> 4) & 0x0f0f0f0f0f0f0f0f) * 0x0101010101010101) >> $final_shift; |
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114
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$bits += $v; |
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} |
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87
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322
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return $bits; |
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} |
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92
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sub combined_length { |
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10
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10
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1
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13
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my ($self,$v1,$v2) = @_; |
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95
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return $self->bits($v1) + $self->bits($v2); |
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} |
97
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98
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sub min { |
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8
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100
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8
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1
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68
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($_[1] < $_[2]) |
100
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? $_[1] : $_[2]; |
101
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} |
102
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103
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1; |
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105
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__END__ |