Document (#16037)

Author

Crestani, F.
Rijsbergen, C.J. van

Title

Information retrieval by imaging

Source

Information retrieval: new systems and current research. Proceedings of the 16th Research Colloquium of the British Computer Society Information Retrieval Specialist Group, Drymen, Scotland, 22-23 Mar 94. Ed.: R. Leon

Imprint

London : Taylor Graham

Year

1996

Pages

S.47-76

Abstract

Explains briefly what constitutes the imaging process and explains how imaging can be used in information retrieval. Proposes an approach based on the concept of: 'a term is a possible world'; which enables the exploitation of term to term relationships which are estimated using an information theoretic measure. Reports results of an evaluation exercise to compare the performance of imaging retrieval, using possible world semantics, with a benchmark and using the Cranfield 2 document collection to measure precision and recall. Initially, the performance imaging retrieval was seen to be better but statistical analysis proved that the difference was not significant. The problem with imaging retrieval lies in the amount of computations needed to be performed at run time and a later experiement investigated the possibility of reducing this amount. Notes lines of further investigation

Theme

Retrievalstudien

Similar documents (author)

1. Crestani, F.; Rijsbergen, C.J. van: Information retrieval by logical imaging (1995) 5.29

   5.293561 = sum of:
     5.293561 = sum of:
       2.5076344 = weight(author_txt:rijsbergen in 1827) [ClassicSimilarity], result of:
         2.5076344 = score(doc=1827,freq=1.0), product of:
           0.6818924 = queryWeight, product of:
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.081123285 = queryNorm
           3.6774635 = fieldWeight in 1827, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.4375 = fieldNorm(doc=1827)
       2.7859263 = weight(author_txt:crestani in 1827) [ClassicSimilarity], result of:
         2.7859263 = score(doc=1827,freq=1.0), product of:
           0.73145247 = queryWeight, product of:
             1.0357027 = boost
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.081123285 = queryNorm
           3.8087592 = fieldWeight in 1827, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.4375 = fieldNorm(doc=1827)
   

2. Crestani, F.; Ruthven, I.; Sanderson, M.; Rijsbergen, C.J. van: ¬The troubles with using a logical model of IR on a large collection of documents : experimenting retrieval by logical imaging on TREC (1996) 3.78

   3.7811148 = sum of:
     3.7811148 = sum of:
       1.7911675 = weight(author_txt:rijsbergen in 591) [ClassicSimilarity], result of:
         1.7911675 = score(doc=591,freq=1.0), product of:
           0.6818924 = queryWeight, product of:
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.081123285 = queryNorm
           2.6267598 = fieldWeight in 591, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.3125 = fieldNorm(doc=591)
       1.9899473 = weight(author_txt:crestani in 591) [ClassicSimilarity], result of:
         1.9899473 = score(doc=591,freq=1.0), product of:
           0.73145247 = queryWeight, product of:
             1.0357027 = boost
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.081123285 = queryNorm
           2.7205422 = fieldWeight in 591, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.3125 = fieldNorm(doc=591)
   

3. Crestani, F.; Dominich, S.; Lalmas, M.; Rijsbergen, C.J.K. van: Mathematical, logical, and formal methods in information retrieval : an introduction to the special issue (2003) 3.78

   3.7811148 = sum of:
     3.7811148 = sum of:
       1.7911675 = weight(author_txt:rijsbergen in 2451) [ClassicSimilarity], result of:
         1.7911675 = score(doc=2451,freq=1.0), product of:
           0.6818924 = queryWeight, product of:
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.081123285 = queryNorm
           2.6267598 = fieldWeight in 2451, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.405631 = idf(docFreq=26, maxDocs=44421)
             0.3125 = fieldNorm(doc=2451)
       1.9899473 = weight(author_txt:crestani in 2451) [ClassicSimilarity], result of:
         1.9899473 = score(doc=2451,freq=1.0), product of:
           0.73145247 = queryWeight, product of:
             1.0357027 = boost
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.081123285 = queryNorm
           2.7205422 = fieldWeight in 2451, product of:
             1.0 = tf(freq=1.0), with freq of:
               1.0 = termFreq=1.0
             8.705735 = idf(docFreq=19, maxDocs=44421)
             0.3125 = fieldNorm(doc=2451)
   

4. Crestani, F.: Combination of similarity measures for effective spoken document retrieval (2003) 1.99

   1.9899473 = sum of:
     1.9899473 = product of:
       3.9798946 = sum of:
         3.9798946 = weight(author_txt:crestani in 5690) [ClassicSimilarity], result of:
           3.9798946 = score(doc=5690,freq=1.0), product of:
             0.73145247 = queryWeight, product of:
               1.0357027 = boost
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.081123285 = queryNorm
             5.4410844 = fieldWeight in 5690, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.625 = fieldNorm(doc=5690)
       0.5 = coord(1/2)
   

5. Crestani, F.; Lee, P.L.: Searching the web by constraining spreading activities (2000) 1.59

   1.5919579 = sum of:
     1.5919579 = product of:
       3.1839159 = sum of:
         3.1839159 = weight(author_txt:crestani in 1394) [ClassicSimilarity], result of:
           3.1839159 = score(doc=1394,freq=1.0), product of:
             0.73145247 = queryWeight, product of:
               1.0357027 = boost
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.081123285 = queryNorm
             4.3528676 = fieldWeight in 1394, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               8.705735 = idf(docFreq=19, maxDocs=44421)
               0.5 = fieldNorm(doc=1394)
       0.5 = coord(1/2)
   

Similar documents (content)

1. Crestani, F.; Rijsbergen, C.J. van: Information retrieval by logical imaging (1995) 0.47

   0.4686638 = sum of:
     0.4686638 = product of:
       1.065145 = sum of:
         0.013194372 = weight(abstract_txt:information in 1827) [ClassicSimilarity], result of:
           0.013194372 = score(doc=1827,freq=3.0), product of:
             0.040310692 = queryWeight, product of:
               1.126122 = boost
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.014798475 = queryNorm
             0.32731694 = fieldWeight in 1827, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.07796265 = weight(abstract_txt:exploitation in 1827) [ClassicSimilarity], result of:
           0.07796265 = score(doc=1827,freq=1.0), product of:
             0.13175046 = queryWeight, product of:
               1.1754137 = boost
               7.574333 = idf(docFreq=61, maxDocs=44421)
               0.014798475 = queryNorm
             0.5917448 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.574333 = idf(docFreq=61, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.0795042 = weight(abstract_txt:estimated in 1827) [ClassicSimilarity], result of:
           0.0795042 = score(doc=1827,freq=1.0), product of:
             0.13348152 = queryWeight, product of:
               1.1831104 = boost
               7.62393 = idf(docFreq=58, maxDocs=44421)
               0.014798475 = queryNorm
             0.59561956 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.62393 = idf(docFreq=58, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.08828309 = weight(abstract_txt:theoretic in 1827) [ClassicSimilarity], result of:
           0.08828309 = score(doc=1827,freq=1.0), product of:
             0.14313509 = queryWeight, product of:
               1.2251457 = boost
               7.894805 = idf(docFreq=44, maxDocs=44421)
               0.014798475 = queryNorm
             0.61678165 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.894805 = idf(docFreq=44, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.044027433 = weight(abstract_txt:world in 1827) [ClassicSimilarity], result of:
           0.044027433 = score(doc=1827,freq=2.0), product of:
             0.09001399 = queryWeight, product of:
               1.3739935 = boost
               4.426988 = idf(docFreq=1442, maxDocs=44421)
               0.014798475 = queryNorm
             0.48911768 = fieldWeight in 1827, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.426988 = idf(docFreq=1442, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.06141171 = weight(abstract_txt:possible in 1827) [ClassicSimilarity], result of:
           0.06141171 = score(doc=1827,freq=3.0), product of:
             0.09816684 = queryWeight, product of:
               1.4348685 = boost
               4.623126 = idf(docFreq=1185, maxDocs=44421)
               0.014798475 = queryNorm
             0.6255851 = fieldWeight in 1827, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.623126 = idf(docFreq=1185, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.022234328 = weight(abstract_txt:using in 1827) [ClassicSimilarity], result of:
           0.022234328 = score(doc=1827,freq=1.0), product of:
             0.082328625 = queryWeight, product of:
               1.6093509 = boost
               3.4568708 = idf(docFreq=3806, maxDocs=44421)
               0.014798475 = queryNorm
             0.27006802 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               3.4568708 = idf(docFreq=3806, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.057644986 = weight(abstract_txt:measure in 1827) [ClassicSimilarity], result of:
           0.057644986 = score(doc=1827,freq=1.0), product of:
             0.1357309 = queryWeight, product of:
               1.6872097 = boost
               5.4361663 = idf(docFreq=525, maxDocs=44421)
               0.014798475 = queryNorm
             0.4247005 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.4361663 = idf(docFreq=525, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.10275976 = weight(abstract_txt:term in 1827) [ClassicSimilarity], result of:
           0.10275976 = score(doc=1827,freq=3.0), product of:
             0.15838346 = queryWeight, product of:
               2.2321851 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.014798475 = queryNorm
             0.64880365 = fieldWeight in 1827, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.053304642 = weight(abstract_txt:retrieval in 1827) [ClassicSimilarity], result of:
           0.053304642 = score(doc=1827,freq=2.0), product of:
             0.13877709 = queryWeight, product of:
               2.697482 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.014798475 = queryNorm
             0.3841026 = fieldWeight in 1827, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
         0.4648177 = weight(abstract_txt:imaging in 1827) [ClassicSimilarity], result of:
           0.4648177 = score(doc=1827,freq=1.0), product of:
             0.78716654 = queryWeight, product of:
               7.0375843 = boost
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.014798475 = queryNorm
             0.59049475 = fieldWeight in 1827, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.078125 = fieldNorm(doc=1827)
       0.44 = coord(11/25)
   

2. Cory, K.A.; Hessler, D.W.: Imaging the archives : now is the time (1993) 0.14

   0.14181715 = sum of:
     0.14181715 = product of:
       1.1818097 = sum of:
         0.010664884 = weight(abstract_txt:information in 7819) [ClassicSimilarity], result of:
           0.010664884 = score(doc=7819,freq=1.0), product of:
             0.040310692 = queryWeight, product of:
               1.126122 = boost
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.014798475 = queryNorm
             0.26456714 = fieldWeight in 7819, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.109375 = fieldNorm(doc=7819)
         0.044021726 = weight(abstract_txt:using in 7819) [ClassicSimilarity], result of:
           0.044021726 = score(doc=7819,freq=2.0), product of:
             0.082328625 = queryWeight, product of:
               1.6093509 = boost
               3.4568708 = idf(docFreq=3806, maxDocs=44421)
               0.014798475 = queryNorm
             0.5347074 = fieldWeight in 7819, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               3.4568708 = idf(docFreq=3806, maxDocs=44421)
               0.109375 = fieldNorm(doc=7819)
         1.127123 = weight(abstract_txt:imaging in 7819) [ClassicSimilarity], result of:
           1.127123 = score(doc=7819,freq=3.0), product of:
             0.78716654 = queryWeight, product of:
               7.0375843 = boost
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.014798475 = queryNorm
             1.4318737 = fieldWeight in 7819, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.109375 = fieldNorm(doc=7819)
       0.12 = coord(3/25)
   

3. Cleverdon, C.W.; Mills, J.: ¬The testing of index language devices (1985) 0.14

   0.13663787 = sum of:
     0.13663787 = product of:
       0.42699334 = sum of:
         0.036104474 = weight(abstract_txt:proved in 4643) [ClassicSimilarity], result of:
           0.036104474 = score(doc=4643,freq=1.0), product of:
             0.11085815 = queryWeight, product of:
               1.078198 = boost
               6.9478774 = idf(docFreq=115, maxDocs=44421)
               0.014798475 = queryNorm
             0.32568175 = fieldWeight in 4643, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.9478774 = idf(docFreq=115, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.037229974 = weight(abstract_txt:constitutes in 4643) [ClassicSimilarity], result of:
           0.037229974 = score(doc=4643,freq=1.0), product of:
             0.113150224 = queryWeight, product of:
               1.0892872 = boost
               7.019336 = idf(docFreq=107, maxDocs=44421)
               0.014798475 = queryNorm
             0.32903138 = fieldWeight in 4643, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.019336 = idf(docFreq=107, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.006463896 = weight(abstract_txt:information in 4643) [ClassicSimilarity], result of:
           0.006463896 = score(doc=4643,freq=2.0), product of:
             0.040310692 = queryWeight, product of:
               1.126122 = boost
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.014798475 = queryNorm
             0.1603519 = fieldWeight in 4643, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.041373715 = weight(abstract_txt:benchmark in 4643) [ClassicSimilarity], result of:
           0.041373715 = score(doc=4643,freq=1.0), product of:
             0.121397555 = queryWeight, product of:
               1.1282872 = boost
               7.270651 = idf(docFreq=83, maxDocs=44421)
               0.014798475 = queryNorm
             0.34081176 = fieldWeight in 4643, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.270651 = idf(docFreq=83, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.19943786 = weight(abstract_txt:cranfield in 4643) [ClassicSimilarity], result of:
           0.19943786 = score(doc=4643,freq=11.0), product of:
             0.15576424 = queryWeight, product of:
               1.2780521 = boost
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.014798475 = queryNorm
             1.2803829 = fieldWeight in 4643, product of:
               3.3166249 = tf(freq=11.0), with freq of:
                 11.0 = termFreq=11.0
               8.235732 = idf(docFreq=31, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.021227196 = weight(abstract_txt:performance in 4643) [ClassicSimilarity], result of:
           0.021227196 = score(doc=4643,freq=1.0), product of:
             0.09802391 = queryWeight, product of:
               1.4338235 = boost
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.014798475 = queryNorm
             0.21655121 = fieldWeight in 4643, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.619759 = idf(docFreq=1189, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.03458699 = weight(abstract_txt:measure in 4643) [ClassicSimilarity], result of:
           0.03458699 = score(doc=4643,freq=1.0), product of:
             0.1357309 = queryWeight, product of:
               1.6872097 = boost
               5.4361663 = idf(docFreq=525, maxDocs=44421)
               0.014798475 = queryNorm
             0.2548203 = fieldWeight in 4643, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.4361663 = idf(docFreq=525, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
         0.050569225 = weight(abstract_txt:retrieval in 4643) [ClassicSimilarity], result of:
           0.050569225 = score(doc=4643,freq=5.0), product of:
             0.13877709 = queryWeight, product of:
               2.697482 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.014798475 = queryNorm
             0.36439174 = fieldWeight in 4643, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.046875 = fieldNorm(doc=4643)
       0.32 = coord(8/25)
   

4. Koulopoulos, T.M.; Frappaolo, C.: Electronic document management systems : where are they today? (1993) 0.13

   0.12916623 = sum of:
     0.12916623 = product of:
       1.0763853 = sum of:
         0.00914133 = weight(abstract_txt:information in 1050) [ClassicSimilarity], result of:
           0.00914133 = score(doc=1050,freq=1.0), product of:
             0.040310692 = queryWeight, product of:
               1.126122 = boost
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.014798475 = queryNorm
             0.22677183 = fieldWeight in 1050, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.09375 = fieldNorm(doc=1050)
         0.10113845 = weight(abstract_txt:retrieval in 1050) [ClassicSimilarity], result of:
           0.10113845 = score(doc=1050,freq=5.0), product of:
             0.13877709 = queryWeight, product of:
               2.697482 = boost
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.014798475 = queryNorm
             0.7287835 = fieldWeight in 1050, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               3.4765 = idf(docFreq=3732, maxDocs=44421)
               0.09375 = fieldNorm(doc=1050)
         0.96610546 = weight(abstract_txt:imaging in 1050) [ClassicSimilarity], result of:
           0.96610546 = score(doc=1050,freq=3.0), product of:
             0.78716654 = queryWeight, product of:
               7.0375843 = boost
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.014798475 = queryNorm
             1.2273203 = fieldWeight in 1050, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.09375 = fieldNorm(doc=1050)
       0.12 = coord(3/25)
   

5. Nugent, W.R.: Virtual reality : advanced imaging special effects let you roam in cyberspace (1991) 0.12

   0.121893965 = sum of:
     0.121893965 = product of:
       1.0157831 = sum of:
         0.015235549 = weight(abstract_txt:information in 4815) [ClassicSimilarity], result of:
           0.015235549 = score(doc=4815,freq=1.0), product of:
             0.040310692 = queryWeight, product of:
               1.126122 = boost
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.014798475 = queryNorm
             0.37795305 = fieldWeight in 4815, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.4188995 = idf(docFreq=10748, maxDocs=44421)
               0.15625 = fieldNorm(doc=4815)
         0.07091214 = weight(abstract_txt:possible in 4815) [ClassicSimilarity], result of:
           0.07091214 = score(doc=4815,freq=1.0), product of:
             0.09816684 = queryWeight, product of:
               1.4348685 = boost
               4.623126 = idf(docFreq=1185, maxDocs=44421)
               0.014798475 = queryNorm
             0.7223635 = fieldWeight in 4815, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.623126 = idf(docFreq=1185, maxDocs=44421)
               0.15625 = fieldNorm(doc=4815)
         0.9296354 = weight(abstract_txt:imaging in 4815) [ClassicSimilarity], result of:
           0.9296354 = score(doc=4815,freq=1.0), product of:
             0.78716654 = queryWeight, product of:
               7.0375843 = boost
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.014798475 = queryNorm
             1.1809895 = fieldWeight in 4815, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.558333 = idf(docFreq=62, maxDocs=44421)
               0.15625 = fieldNorm(doc=4815)
       0.12 = coord(3/25)