Document (#16527)

Author
Goker, A.
Title
Context learning in Okapi
Source
Journal of documentation. 53(1997) no.1, S.80-83
Year
1997
Abstract
A user who makes repeated use of a retrieval system may be assumed to have a context which is common to successive users, and that an information retrieval system which could make use of this context may be better able to match specific needs. Describes a machine learning approach to inferring the user's context, developed in conjunction with the Okapi information retrieval system. Presents the results of an evaluation experiment. There is scope for information retrieval systems to operate in this way
Content
Vgl. auch unter: http://www.emeraldinsight.com/10.1108/EUM0000000007194.
Footnote
Contribution to a thematic issue on Okapi and information retrieval research
Object
Okapi

Similar documents (content)

  1. Robertson, S.E.: OKAPI at TREC (1994) 0.21
    0.21261992 = sum of:
      0.21261992 = product of:
        0.88591635 = sum of:
          0.02530914 = weight(abstract_txt:which in 7951) [ClassicSimilarity], result of:
            0.02530914 = score(doc=7951,freq=1.0), product of:
              0.06948791 = queryWeight, product of:
                1.2446318 = boost
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.019160649 = queryNorm
              0.36422366 = fieldWeight in 7951, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
          0.1321403 = weight(abstract_txt:match in 7951) [ClassicSimilarity], result of:
            0.1321403 = score(doc=7951,freq=1.0), product of:
              0.16598588 = queryWeight, product of:
                1.3602128 = boost
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.019160649 = queryNorm
              0.7960936 = fieldWeight in 7951, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
          0.021719396 = weight(abstract_txt:information in 7951) [ClassicSimilarity], result of:
            0.021719396 = score(doc=7951,freq=1.0), product of:
              0.07183232 = queryWeight, product of:
                1.5498577 = boost
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.019160649 = queryNorm
              0.30236244 = fieldWeight in 7951, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
          0.058878448 = weight(abstract_txt:system in 7951) [ClassicSimilarity], result of:
            0.058878448 = score(doc=7951,freq=1.0), product of:
              0.1396558 = queryWeight, product of:
                2.161033 = boost
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.019160649 = queryNorm
              0.42159688 = fieldWeight in 7951, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
          0.12158351 = weight(abstract_txt:retrieval in 7951) [ClassicSimilarity], result of:
            0.12158351 = score(doc=7951,freq=2.0), product of:
              0.19783695 = queryWeight, product of:
                2.9699898 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.019160649 = queryNorm
              0.6145642 = fieldWeight in 7951, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
          0.5262856 = weight(abstract_txt:okapi in 7951) [ClassicSimilarity], result of:
            0.5262856 = score(doc=7951,freq=1.0), product of:
              0.52545875 = queryWeight, product of:
                3.4225955 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.019160649 = queryNorm
              1.0015736 = fieldWeight in 7951, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.125 = fieldNorm(doc=7951)
        0.24 = coord(6/25)
    
  2. Robertson, S.E.: Overview of the Okapi projects (1997) 0.20
    0.201476 = sum of:
      0.201476 = product of:
        0.8394833 = sum of:
          0.012471681 = weight(abstract_txt:this in 5703) [ClassicSimilarity], result of:
            0.012471681 = score(doc=5703,freq=1.0), product of:
              0.047388062 = queryWeight, product of:
                1.0278287 = boost
                2.4062347 = idf(docFreq=10885, maxDocs=44421)
                0.019160649 = queryNorm
              0.26318192 = fieldWeight in 5703, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4062347 = idf(docFreq=10885, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
          0.022145497 = weight(abstract_txt:which in 5703) [ClassicSimilarity], result of:
            0.022145497 = score(doc=5703,freq=1.0), product of:
              0.06948791 = queryWeight, product of:
                1.2446318 = boost
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.019160649 = queryNorm
              0.3186957 = fieldWeight in 5703, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
          0.02687638 = weight(abstract_txt:information in 5703) [ClassicSimilarity], result of:
            0.02687638 = score(doc=5703,freq=2.0), product of:
              0.07183232 = queryWeight, product of:
                1.5498577 = boost
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.019160649 = queryNorm
              0.37415442 = fieldWeight in 5703, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
          0.05151864 = weight(abstract_txt:system in 5703) [ClassicSimilarity], result of:
            0.05151864 = score(doc=5703,freq=1.0), product of:
              0.1396558 = queryWeight, product of:
                2.161033 = boost
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.019160649 = queryNorm
              0.36889726 = fieldWeight in 5703, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
          0.07522596 = weight(abstract_txt:retrieval in 5703) [ClassicSimilarity], result of:
            0.07522596 = score(doc=5703,freq=1.0), product of:
              0.19783695 = queryWeight, product of:
                2.9699898 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.019160649 = queryNorm
              0.3802422 = fieldWeight in 5703, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
          0.6512452 = weight(abstract_txt:okapi in 5703) [ClassicSimilarity], result of:
            0.6512452 = score(doc=5703,freq=2.0), product of:
              0.52545875 = queryWeight, product of:
                3.4225955 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.019160649 = queryNorm
              1.239384 = fieldWeight in 5703, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.109375 = fieldNorm(doc=5703)
        0.24 = coord(6/25)
    
  3. Beaulieu, M.; Robertson, S.; Rasmussen, E.: Evaluating interactive systems in TREC (1996) 0.19
    0.19031876 = sum of:
      0.19031876 = product of:
        0.67970985 = sum of:
          0.0089083435 = weight(abstract_txt:this in 3066) [ClassicSimilarity], result of:
            0.0089083435 = score(doc=3066,freq=1.0), product of:
              0.047388062 = queryWeight, product of:
                1.0278287 = boost
                2.4062347 = idf(docFreq=10885, maxDocs=44421)
                0.019160649 = queryNorm
              0.18798709 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4062347 = idf(docFreq=10885, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.057934076 = weight(abstract_txt:experiment in 3066) [ClassicSimilarity], result of:
            0.057934076 = score(doc=3066,freq=1.0), product of:
              0.13104397 = queryWeight, product of:
                1.2085922 = boost
                5.658835 = idf(docFreq=420, maxDocs=44421)
                0.019160649 = queryNorm
              0.44209647 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.658835 = idf(docFreq=420, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.015818212 = weight(abstract_txt:which in 3066) [ClassicSimilarity], result of:
            0.015818212 = score(doc=3066,freq=1.0), product of:
              0.06948791 = queryWeight, product of:
                1.2446318 = boost
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.019160649 = queryNorm
              0.2276398 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.9137893 = idf(docFreq=6552, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.013574623 = weight(abstract_txt:information in 3066) [ClassicSimilarity], result of:
            0.013574623 = score(doc=3066,freq=1.0), product of:
              0.07183232 = queryWeight, product of:
                1.5498577 = boost
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.019160649 = queryNorm
              0.18897653 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.16147812 = weight(abstract_txt:successive in 3066) [ClassicSimilarity], result of:
            0.16147812 = score(doc=3066,freq=1.0), product of:
              0.25953948 = queryWeight, product of:
                1.7008773 = boost
                7.963798 = idf(docFreq=41, maxDocs=44421)
                0.019160649 = queryNorm
              0.6221717 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.963798 = idf(docFreq=41, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.09306798 = weight(abstract_txt:retrieval in 3066) [ClassicSimilarity], result of:
            0.09306798 = score(doc=3066,freq=3.0), product of:
              0.19783695 = queryWeight, product of:
                2.9699898 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.019160649 = queryNorm
              0.4704277 = fieldWeight in 3066, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
          0.3289285 = weight(abstract_txt:okapi in 3066) [ClassicSimilarity], result of:
            0.3289285 = score(doc=3066,freq=1.0), product of:
              0.52545875 = queryWeight, product of:
                3.4225955 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.019160649 = queryNorm
              0.6259835 = fieldWeight in 3066, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.078125 = fieldNorm(doc=3066)
        0.28 = coord(7/25)
    
  4. Okapi and information retrieval (1997) 0.19
    0.19019325 = sum of:
      0.19019325 = product of:
        1.5849438 = sum of:
          0.05429849 = weight(abstract_txt:information in 518) [ClassicSimilarity], result of:
            0.05429849 = score(doc=518,freq=1.0), product of:
              0.07183232 = queryWeight, product of:
                1.5498577 = boost
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.019160649 = queryNorm
              0.7559061 = fieldWeight in 518, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.3125 = fieldNorm(doc=518)
          0.2149313 = weight(abstract_txt:retrieval in 518) [ClassicSimilarity], result of:
            0.2149313 = score(doc=518,freq=1.0), product of:
              0.19783695 = queryWeight, product of:
                2.9699898 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.019160649 = queryNorm
              1.0864062 = fieldWeight in 518, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.3125 = fieldNorm(doc=518)
          1.315714 = weight(abstract_txt:okapi in 518) [ClassicSimilarity], result of:
            1.315714 = score(doc=518,freq=1.0), product of:
              0.52545875 = queryWeight, product of:
                3.4225955 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.019160649 = queryNorm
              2.503934 = fieldWeight in 518, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.3125 = fieldNorm(doc=518)
        0.12 = coord(3/25)
    
  5. Beaulieu, M.; Jones, S.: Interactive searching and interface issues in the Okapi best match probabilistic retrieval system (1998) 0.18
    0.18402362 = sum of:
      0.18402362 = product of:
        0.7667651 = sum of:
          0.07577716 = weight(abstract_txt:user's in 1430) [ClassicSimilarity], result of:
            0.07577716 = score(doc=1430,freq=1.0), product of:
              0.1387924 = queryWeight, product of:
                1.2438102 = boost
                5.823732 = idf(docFreq=356, maxDocs=44421)
                0.019160649 = queryNorm
              0.54597485 = fieldWeight in 1430, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.823732 = idf(docFreq=356, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
          0.099105224 = weight(abstract_txt:match in 1430) [ClassicSimilarity], result of:
            0.099105224 = score(doc=1430,freq=1.0), product of:
              0.16598588 = queryWeight, product of:
                1.3602128 = boost
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.019160649 = queryNorm
              0.5970702 = fieldWeight in 1430, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.3687487 = idf(docFreq=206, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
          0.023036899 = weight(abstract_txt:information in 1430) [ClassicSimilarity], result of:
            0.023036899 = score(doc=1430,freq=2.0), product of:
              0.07183232 = queryWeight, product of:
                1.5498577 = boost
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.019160649 = queryNorm
              0.3207038 = fieldWeight in 1430, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                2.4188995 = idf(docFreq=10748, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
          0.062450025 = weight(abstract_txt:system in 1430) [ClassicSimilarity], result of:
            0.062450025 = score(doc=1430,freq=2.0), product of:
              0.1396558 = queryWeight, product of:
                2.161033 = boost
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.019160649 = queryNorm
              0.447171 = fieldWeight in 1430, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.372775 = idf(docFreq=4140, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
          0.11168157 = weight(abstract_txt:retrieval in 1430) [ClassicSimilarity], result of:
            0.11168157 = score(doc=1430,freq=3.0), product of:
              0.19783695 = queryWeight, product of:
                2.9699898 = boost
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.019160649 = queryNorm
              0.5645132 = fieldWeight in 1430, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                3.4765 = idf(docFreq=3732, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
          0.3947142 = weight(abstract_txt:okapi in 1430) [ClassicSimilarity], result of:
            0.3947142 = score(doc=1430,freq=1.0), product of:
              0.52545875 = queryWeight, product of:
                3.4225955 = boost
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.019160649 = queryNorm
              0.7511802 = fieldWeight in 1430, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                8.0125885 = idf(docFreq=39, maxDocs=44421)
                0.09375 = fieldNorm(doc=1430)
        0.24 = coord(6/25)