HumHub Documentation (unofficial)

DefaultSimilarity extends AbstractSimilarity
in package

Tags
category

Zend

subpackage

Search

Table of Contents

Properties

$_defaultImpl  : AbstractSimilarity
The Similarity implementation used by default.
$_normTable  : array<string|int, mixed>
Cache of decoded bytes.

Methods

coord()  : float
Implemented as 'overlap/maxOverlap'.
decodeNorm()  : float
Decodes a normalization factor stored in an index.
encodeNorm()  : int
Encodes a normalization factor for storage in an index.
getDefault()  : AbstractSimilarity
Return the default Similarity implementation used by indexing and search code.
idf()  : float
Computes a score factor for a simple term or a phrase.
idfFreq()  : float
Implemented as 'log(numDocs/(docFreq+1)) + 1'.
lengthNorm()  : float
Implemented as '1/sqrt(numTerms)'.
queryNorm()  : float
Implemented as '1/sqrt(sumOfSquaredWeights)'.
setDefault()  : void
Set the default Similarity implementation used by indexing and search code.
sloppyFreq()  : float
Implemented as '1/(distance + 1)'.
tf()  : float
Implemented as 'sqrt(freq)'.
_floatToByte()  : float
Float to byte conversion

Properties

$_normTable

Cache of decoded bytes.

private static array<string|int, mixed> $_normTable = array(0 => 0.0, 1 => 5.820766E-10, 2 => 6.984919300000001E-10, 3 => 8.1490725E-10, 4 => 9.313226E-10, 5 => 1.1641532E-9, 6 => 1.3969839E-9, 7 => 1.6298145E-9, 8 => 1.8626451E-9, 9 => 2.3283064E-9, 10 => 2.7939677E-9, 11 => 3.259629E-9, 12 => 3.7252903E-9, 13 => 4.656613E-9, 14 => 5.5879354E-9, 15 => 6.519258E-9, 16 => 7.4505806E-9, 17 => 9.313226E-9, 18 => 1.1175871E-8, 19 => 1.3038516E-8, 20 => 1.4901161E-8, 21 => 1.8626451E-8, 22 => 2.2351742E-8, 23 => 2.6077032E-8, 24 => 2.9802322E-8, 25 => 3.7252903E-8, 26 => 4.4703484E-8, 27 => 5.2154064E-8, 28 => 5.960464500000001E-8, 29 => 7.4505806E-8, 30 => 8.940697E-8, 31 => 1.0430813E-7, 32 => 1.1920929E-7, 33 => 1.4901161E-7, 34 => 1.7881393E-7, 35 => 2.0861626E-7, 36 => 2.3841858E-7, 37 => 2.9802322E-7, 38 => 3.5762787E-7, 39 => 4.172325E-7, 40 => 4.7683716E-7, 41 => 5.9604645E-7, 42 => 7.1525574E-7, 43 => 8.34465E-7, 44 => 9.536743E-7, 45 => 1.1920929E-6, 46 => 1.4305115E-6, 47 => 1.66893E-6, 48 => 1.9073486E-6, 49 => 2.3841858E-6, 50 => 2.861023E-6, 51 => 3.33786E-6, 52 => 3.8146973E-6, 53 => 4.7683716E-6, 54 => 5.722046E-6, 55 => 6.67572E-6, 56 => 7.6293945E-6, 57 => 9.536743000000001E-6, 58 => 1.1444092E-5, 59 => 1.335144E-5, 60 => 1.5258789E-5, 61 => 1.9073486E-5, 62 => 2.2888184E-5, 63 => 2.670288E-5, 64 => 3.0517578E-5, 65 => 3.8146973E-5, 66 => 4.5776367E-5, 67 => 5.340576E-5, 68 => 6.1035156E-5, 69 => 7.6293945E-5, 70 => 9.1552734E-5, 71 => 0.00010681152, 72 => 0.00012207031, 73 => 0.00015258789, 74 => 0.00018310547, 75 => 0.00021362305, 76 => 0.00024414062, 77 => 0.00030517578, 78 => 0.00036621094, 79 => 0.0004272461, 80 => 0.00048828125, 81 => 0.00061035156, 82 => 0.0007324219, 83 => 0.0008544922, 84 => 0.0009765625, 85 => 0.0012207031, 86 => 0.0014648438, 87 => 0.0017089844, 88 => 0.001953125, 89 => 0.0024414062, 90 => 0.0029296875, 91 => 0.0034179688, 92 => 0.00390625, 93 => 0.0048828125, 94 => 0.005859375, 95 => 0.0068359375, 96 => 0.0078125, 97 => 0.009765625, 98 => 0.01171875, 99 => 0.013671875, 100 => 0.015625, 101 => 0.01953125, 102 => 0.0234375, 103 => 0.02734375, 104 => 0.03125, 105 => 0.0390625, 106 => 0.046875, 107 => 0.0546875, 108 => 0.0625, 109 => 0.078125, 110 => 0.09375, 111 => 0.109375, 112 => 0.125, 113 => 0.15625, 114 => 0.1875, 115 => 0.21875, 116 => 0.25, 117 => 0.3125, 118 => 0.375, 119 => 0.4375, 120 => 0.5, 121 => 0.625, 122 => 0.75, 123 => 0.875, 124 => 1.0, 125 => 1.25, 126 => 1.5, 127 => 1.75, 128 => 2.0, 129 => 2.5, 130 => 3.0, 131 => 3.5, 132 => 4.0, 133 => 5.0, 134 => 6.0, 135 => 7.0, 136 => 8.0, 137 => 10.0, 138 => 12.0, 139 => 14.0, 140 => 16.0, 141 => 20.0, 142 => 24.0, 143 => 28.0, 144 => 32.0, 145 => 40.0, 146 => 48.0, 147 => 56.0, 148 => 64.0, 149 => 80.0, 150 => 96.0, 151 => 112.0, 152 => 128.0, 153 => 160.0, 154 => 192.0, 155 => 224.0, 156 => 256.0, 157 => 320.0, 158 => 384.0, 159 => 448.0, 160 => 512.0, 161 => 640.0, 162 => 768.0, 163 => 896.0, 164 => 1024.0, 165 => 1280.0, 166 => 1536.0, 167 => 1792.0, 168 => 2048.0, 169 => 2560.0, 170 => 3072.0, 171 => 3584.0, 172 => 4096.0, 173 => 5120.0, 174 => 6144.0, 175 => 7168.0, 176 => 8192.0, 177 => 10240.0, 178 => 12288.0, 179 => 14336.0, 180 => 16384.0, 181 => 20480.0, 182 => 24576.0, 183 => 28672.0, 184 => 32768.0, 185 => 40960.0, 186 => 49152.0, 187 => 57344.0, 188 => 65536.0, 189 => 81920.0, 190 => 98304.0, 191 => 114688.0, 192 => 131072.0, 193 => 163840.0, 194 => 196608.0, 195 => 229376.0, 196 => 262144.0, 197 => 327680.0, 198 => 393216.0, 199 => 458752.0, 200 => 524288.0, 201 => 655360.0, 202 => 786432.0, 203 => 917504.0, 204 => 1048576.0, 205 => 1310720.0, 206 => 1572864.0, 207 => 1835008.0, 208 => 2097152.0, 209 => 2621440.0, 210 => 3145728.0, 211 => 3670016.0, 212 => 4194304.0, 213 => 5242880.0, 214 => 6291456.0, 215 => 7340032.0, 216 => 8388608.0, 217 => 10485760.0, 218 => 12582912.0, 219 => 14680064.0, 220 => 16777216.0, 221 => 20971520.0, 222 => 25165824.0, 223 => 29360128.0, 224 => 33554432.0, 225 => 41943040.0, 226 => 50331648.0, 227 => 58720256.0, 228 => 67108864.0, 229 => 83886080.0, 230 => 100663296.0, 231 => 117440512.0, 232 => 134217728.0, 233 => 167772160.0, 234 => 201326592.0, 235 => 234881024.0, 236 => 268435456.0, 237 => 335544320.0, 238 => 402653184.0, 239 => 469762048.0, 240 => 536870910.0, 241 => 671088640.0, 242 => 805306370.0, 243 => 939524100.0, 244 => 1073741820.0, 245 => 1342177280.0, 246 => 1610612740.0, 247 => 1879048190.0, 248 => 2147483650.0, 249 => 2684354560.0, 250 => 3221225470.0, 251 => 3758096380.0, 252 => 4294967300.0, 253 => 5368709100.0, 254 => 6442450900.0, 255 => 7516192800.0)

Array of floats

Methods

coord()

Implemented as 'overlap/maxOverlap'.

public coord(int $overlap, int $maxOverlap) : float
Parameters
$overlap : int
$maxOverlap : int
Return values
float

decodeNorm()

Decodes a normalization factor stored in an index.

public static decodeNorm(int $byte) : float
Parameters
$byte : int
Return values
float

encodeNorm()

Encodes a normalization factor for storage in an index.

public static encodeNorm(float $f) : int

The encoding uses a five-bit exponent and three-bit mantissa, thus representing values from around 7x10^9 to 2x10^-9 with about one significant decimal digit of accuracy. Zero is also represented. Negative numbers are rounded up to zero. Values too large to represent are rounded down to the largest representable value. Positive values too small to represent are rounded up to the smallest positive representable value.

Parameters
$f : float
Return values
int

idf()

Computes a score factor for a simple term or a phrase.

public idf(mixed $input, SearchIndexInterface $reader) : float

The default implementation is: return idfFreq(searcher.docFreq(term), searcher.maxDoc());

input - the term in question or array of terms reader - reader the document collection being searched Returns a score factor for the term

Parameters
$input : mixed
$reader : SearchIndexInterface
Return values
float —

a score factor for the term

idfFreq()

Implemented as 'log(numDocs/(docFreq+1)) + 1'.

public idfFreq(int $docFreq, int $numDocs) : float
Parameters
$docFreq : int
$numDocs : int
Return values
float

lengthNorm()

Implemented as '1/sqrt(numTerms)'.

public lengthNorm(string $fieldName, int $numTerms) : float
Parameters
$fieldName : string
$numTerms : int
Return values
float

queryNorm()

Implemented as '1/sqrt(sumOfSquaredWeights)'.

public queryNorm(float $sumOfSquaredWeights) : float
Parameters
$sumOfSquaredWeights : float
Return values
float

sloppyFreq()

Implemented as '1/(distance + 1)'.

public sloppyFreq(int $distance) : float
Parameters
$distance : int
Return values
float

tf()

Implemented as 'sqrt(freq)'.

public tf(float $freq) : float
Parameters
$freq : float
Return values
float

_floatToByte()

Float to byte conversion

private static _floatToByte(float $f) : float
Parameters
$f : float
Return values
float 

        

        
    




    

    

                                

                

                                
    

        On this page

        
    


                

                            

            

    

        

            
Search results