Document (#34445)

Author
Cecchini, R.L.
Lorenzetti, C.M.
Maguitman, A.G.
Brignole, N.B.
Title
Using genetic algorithms to evolve a population of topical queries
Source
Information processing and management. 44(2008) no.6, S.1863-1878
Year
2008
Abstract
Systems for searching the Web based on thematic contexts can be built on top of a conventional search engine and benefit from the huge amount of content as well as from the functionality available through the search engine interface. The quality of the material collected by such systems is highly dependant on the vocabulary used to generate the search queries. In this scenario, selecting good query terms can be seen as an optimization problem where the objective function to be optimized is based on the effectiveness of a query to retrieve relevant material. Some characteristics of this optimization problem are: (1) the high-dimensionality of the search space, where candidate solutions are queries and each term corresponds to a different dimension, (2) the existence of acceptable suboptimal solutions, (3) the possibility of finding multiple solutions, and in many cases (4) the quest for novelty. This article describes optimization techniques based on Genetic Algorithms to evolve "good query terms" in the context of a given topic. The proposed techniques place emphasis on searching for novel material that is related to the search context. We discuss the use of a mutation pool to allow the generation of queries with new terms, study the effect of different mutation rates on the exploration of query-space, and discuss the use of a especially developed fitness function that favors the construction of queries containing novel but related terms.
Footnote
Beitrag in einem Themenheft "Adaptive information retrieval"

Similar documents (content)

  1. Robertson, A.M.; Willett, P.: Use of genetic algorithms in information retrieval (1995) 0.25
    0.25160897 = sum of:
      0.25160897 = product of:
        0.786278 = sum of:
          0.04628027 = weight(abstract_txt:techniques in 3487) [ClassicSimilarity], result of:
            0.04628027 = score(doc=3487,freq=1.0), product of:
              0.09351174 = queryWeight, product of:
                1.0597827 = boost
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.019500135 = queryNorm
              0.494914 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.024599424 = weight(abstract_txt:based in 3487) [ClassicSimilarity], result of:
            0.024599424 = score(doc=3487,freq=1.0), product of:
              0.07023969 = queryWeight, product of:
                1.1249176 = boost
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.019500135 = queryNorm
              0.35022113 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.085912764 = weight(abstract_txt:good in 3487) [ClassicSimilarity], result of:
            0.085912764 = score(doc=3487,freq=1.0), product of:
              0.1412453 = queryWeight, product of:
                1.3024791 = boost
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.019500135 = queryNorm
              0.60825217 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.08737922 = weight(abstract_txt:function in 3487) [ClassicSimilarity], result of:
            0.08737922 = score(doc=3487,freq=1.0), product of:
              0.14284804 = queryWeight, product of:
                1.3098481 = boost
                5.592626 = idf(docFreq=437, maxDocs=43254)
                0.019500135 = queryNorm
              0.6116935 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.592626 = idf(docFreq=437, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.09486211 = weight(abstract_txt:algorithms in 3487) [ClassicSimilarity], result of:
            0.09486211 = score(doc=3487,freq=1.0), product of:
              0.15089124 = queryWeight, product of:
                1.3462193 = boost
                5.747919 = idf(docFreq=374, maxDocs=43254)
                0.019500135 = queryNorm
              0.6286787 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.747919 = idf(docFreq=374, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.23015496 = weight(abstract_txt:genetic in 3487) [ClassicSimilarity], result of:
            0.23015496 = score(doc=3487,freq=1.0), product of:
              0.27244726 = queryWeight, product of:
                1.8089435 = boost
                7.7236013 = idf(docFreq=51, maxDocs=43254)
                0.019500135 = queryNorm
              0.8447689 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.7236013 = idf(docFreq=51, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.066765055 = weight(abstract_txt:terms in 3487) [ClassicSimilarity], result of:
            0.066765055 = score(doc=3487,freq=1.0), product of:
              0.15042211 = queryWeight, product of:
                1.9008796 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019500135 = queryNorm
              0.44385132 = fieldWeight in 3487, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
          0.15032424 = weight(abstract_txt:query in 3487) [ClassicSimilarity], result of:
            0.15032424 = score(doc=3487,freq=2.0), product of:
              0.20509492 = queryWeight, product of:
                2.2196076 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019500135 = queryNorm
              0.7329496 = fieldWeight in 3487, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.109375 = fieldNorm(doc=3487)
        0.32 = coord(8/25)
    
  2. Cecchini, R.L.; Lorenzetti, C.M.; Maguitman, A.G.; Brignole, N.B.: Multiobjective evolutionary algorithms for context-based search (2010) 0.23
    0.2296297 = sum of:
      0.2296297 = product of:
        0.71759284 = sum of:
          0.029524641 = weight(abstract_txt:context in 483) [ClassicSimilarity], result of:
            0.029524641 = score(doc=483,freq=1.0), product of:
              0.08672494 = queryWeight, product of:
                1.0206004 = boost
                4.3576326 = idf(docFreq=1505, maxDocs=43254)
                0.019500135 = queryNorm
              0.34044003 = fieldWeight in 483, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.3576326 = idf(docFreq=1505, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.057256985 = weight(abstract_txt:techniques in 483) [ClassicSimilarity], result of:
            0.057256985 = score(doc=483,freq=3.0), product of:
              0.09351174 = queryWeight, product of:
                1.0597827 = boost
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.019500135 = queryNorm
              0.6122973 = fieldWeight in 483, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.035142034 = weight(abstract_txt:based in 483) [ClassicSimilarity], result of:
            0.035142034 = score(doc=483,freq=4.0), product of:
              0.07023969 = queryWeight, product of:
                1.1249176 = boost
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.019500135 = queryNorm
              0.5003159 = fieldWeight in 483, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.056186777 = weight(abstract_txt:discuss in 483) [ClassicSimilarity], result of:
            0.056186777 = score(doc=483,freq=1.0), product of:
              0.13318142 = queryWeight, product of:
                1.2647526 = boost
                5.400083 = idf(docFreq=530, maxDocs=43254)
                0.019500135 = queryNorm
              0.4218815 = fieldWeight in 483, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.400083 = idf(docFreq=530, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.12883975 = weight(abstract_txt:evolve in 483) [ClassicSimilarity], result of:
            0.12883975 = score(doc=483,freq=1.0), product of:
              0.23159054 = queryWeight, product of:
                1.6678008 = boost
                7.120968 = idf(docFreq=94, maxDocs=43254)
                0.019500135 = queryNorm
              0.5563256 = fieldWeight in 483, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.120968 = idf(docFreq=94, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.043480806 = weight(abstract_txt:search in 483) [ClassicSimilarity], result of:
            0.043480806 = score(doc=483,freq=1.0), product of:
              0.15235825 = queryWeight, product of:
                2.1388817 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019500135 = queryNorm
              0.2853853 = fieldWeight in 483, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.13150631 = weight(abstract_txt:query in 483) [ClassicSimilarity], result of:
            0.13150631 = score(doc=483,freq=3.0), product of:
              0.20509492 = queryWeight, product of:
                2.2196076 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019500135 = queryNorm
              0.6411973 = fieldWeight in 483, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
          0.23565556 = weight(abstract_txt:queries in 483) [ClassicSimilarity], result of:
            0.23565556 = score(doc=483,freq=4.0), product of:
              0.29614156 = queryWeight, product of:
                2.9819713 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019500135 = queryNorm
              0.79575306 = fieldWeight in 483, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.078125 = fieldNorm(doc=483)
        0.32 = coord(8/25)
    
  3. Pu, H.-T.; Chuang, S.-L.; Yang, C.: Subject categorization of query terms for exploring Web users' search interests (2002) 0.22
    0.22311631 = sum of:
      0.22311631 = product of:
        0.6197675 = sum of:
          0.031548765 = weight(abstract_txt:searching in 2588) [ClassicSimilarity], result of:
            0.031548765 = score(doc=2588,freq=2.0), product of:
              0.08348449 = queryWeight, product of:
                1.0013518 = boost
                4.275447 = idf(docFreq=1634, maxDocs=43254)
                0.019500135 = queryNorm
              0.37789968 = fieldWeight in 2588, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.275447 = idf(docFreq=1634, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.014056815 = weight(abstract_txt:based in 2588) [ClassicSimilarity], result of:
            0.014056815 = score(doc=2588,freq=1.0), product of:
              0.07023969 = queryWeight, product of:
                1.1249176 = boost
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.019500135 = queryNorm
              0.20012636 = fieldWeight in 2588, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.04790009 = weight(abstract_txt:engine in 2588) [ClassicSimilarity], result of:
            0.04790009 = score(doc=2588,freq=1.0), product of:
              0.13894784 = queryWeight, product of:
                1.2918428 = boost
                5.5157495 = idf(docFreq=472, maxDocs=43254)
                0.019500135 = queryNorm
              0.34473434 = fieldWeight in 2588, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.5157495 = idf(docFreq=472, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.04909301 = weight(abstract_txt:good in 2588) [ClassicSimilarity], result of:
            0.04909301 = score(doc=2588,freq=1.0), product of:
              0.1412453 = queryWeight, product of:
                1.3024791 = boost
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.019500135 = queryNorm
              0.34757268 = fieldWeight in 2588, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.049930982 = weight(abstract_txt:function in 2588) [ClassicSimilarity], result of:
            0.049930982 = score(doc=2588,freq=1.0), product of:
              0.14284804 = queryWeight, product of:
                1.3098481 = boost
                5.592626 = idf(docFreq=437, maxDocs=43254)
                0.019500135 = queryNorm
              0.34953913 = fieldWeight in 2588, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.592626 = idf(docFreq=437, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.066080265 = weight(abstract_txt:terms in 2588) [ClassicSimilarity], result of:
            0.066080265 = score(doc=2588,freq=3.0), product of:
              0.15042211 = queryWeight, product of:
                1.9008796 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019500135 = queryNorm
              0.43929887 = fieldWeight in 2588, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.09203152 = weight(abstract_txt:search in 2588) [ClassicSimilarity], result of:
            0.09203152 = score(doc=2588,freq=7.0), product of:
              0.15235825 = queryWeight, product of:
                2.1388817 = boost
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.019500135 = queryNorm
              0.6040469 = fieldWeight in 2588, product of:
                2.6457512 = tf(freq=7.0), with freq of:
                  7.0 = termFreq=7.0
                3.6529322 = idf(docFreq=3046, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.13581914 = weight(abstract_txt:query in 2588) [ClassicSimilarity], result of:
            0.13581914 = score(doc=2588,freq=5.0), product of:
              0.20509492 = queryWeight, product of:
                2.2196076 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019500135 = queryNorm
              0.6622258 = fieldWeight in 2588, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
          0.1333069 = weight(abstract_txt:queries in 2588) [ClassicSimilarity], result of:
            0.1333069 = score(doc=2588,freq=2.0), product of:
              0.29614156 = queryWeight, product of:
                2.9819713 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019500135 = queryNorm
              0.4501459 = fieldWeight in 2588, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.0625 = fieldNorm(doc=2588)
        0.36 = coord(9/25)
    
  4. Cheng, C.-S.; Chung, C.-P.; Shann, J.J.-J.: Fast query evaluation through document identifier assignment for inverted file-based information retrieval systems (2006) 0.22
    0.22280945 = sum of:
      0.22280945 = product of:
        0.6962795 = sum of:
          0.050534002 = weight(abstract_txt:problem in 2980) [ClassicSimilarity], result of:
            0.050534002 = score(doc=2980,freq=4.0), product of:
              0.09071171 = queryWeight, product of:
                1.0437956 = boost
                4.4566684 = idf(docFreq=1363, maxDocs=43254)
                0.019500135 = queryNorm
              0.55708355 = fieldWeight in 2980, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                4.4566684 = idf(docFreq=1363, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.029678145 = weight(abstract_txt:where in 2980) [ClassicSimilarity], result of:
            0.029678145 = score(doc=2980,freq=1.0), product of:
              0.10098389 = queryWeight, product of:
                1.1013106 = boost
                4.7022386 = idf(docFreq=1066, maxDocs=43254)
                0.019500135 = queryNorm
              0.2938899 = fieldWeight in 2980, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.7022386 = idf(docFreq=1066, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.019879337 = weight(abstract_txt:based in 2980) [ClassicSimilarity], result of:
            0.019879337 = score(doc=2980,freq=2.0), product of:
              0.07023969 = queryWeight, product of:
                1.1249176 = boost
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.019500135 = queryNorm
              0.28302142 = fieldWeight in 2980, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.2020218 = idf(docFreq=4782, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.04909301 = weight(abstract_txt:good in 2980) [ClassicSimilarity], result of:
            0.04909301 = score(doc=2980,freq=1.0), product of:
              0.1412453 = queryWeight, product of:
                1.3024791 = boost
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.019500135 = queryNorm
              0.34757268 = fieldWeight in 2980, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.08530925 = weight(abstract_txt:terms in 2980) [ClassicSimilarity], result of:
            0.08530925 = score(doc=2980,freq=5.0), product of:
              0.15042211 = queryWeight, product of:
                1.9008796 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019500135 = queryNorm
              0.5671324 = fieldWeight in 2980, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.16070338 = weight(abstract_txt:query in 2980) [ClassicSimilarity], result of:
            0.16070338 = score(doc=2980,freq=7.0), product of:
              0.20509492 = queryWeight, product of:
                2.2196076 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019500135 = queryNorm
              0.7835561 = fieldWeight in 2980, product of:
                2.6457512 = tf(freq=7.0), with freq of:
                  7.0 = termFreq=7.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.20682013 = weight(abstract_txt:optimization in 2980) [ClassicSimilarity], result of:
            0.20682013 = score(doc=2980,freq=1.0), product of:
              0.42174816 = queryWeight, product of:
                2.7564874 = boost
                7.846204 = idf(docFreq=45, maxDocs=43254)
                0.019500135 = queryNorm
              0.49038774 = fieldWeight in 2980, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                7.846204 = idf(docFreq=45, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
          0.09426223 = weight(abstract_txt:queries in 2980) [ClassicSimilarity], result of:
            0.09426223 = score(doc=2980,freq=1.0), product of:
              0.29614156 = queryWeight, product of:
                2.9819713 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019500135 = queryNorm
              0.31830123 = fieldWeight in 2980, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.0625 = fieldNorm(doc=2980)
        0.32 = coord(8/25)
    
  5. Smith, M.P.; Smith, M.: ¬The use of genetic programming to build Boolean queries for text retrieval through relevance feedback (1997) 0.22
    0.21941365 = sum of:
      0.21941365 = product of:
        0.7836202 = sum of:
          0.033057336 = weight(abstract_txt:techniques in 2762) [ClassicSimilarity], result of:
            0.033057336 = score(doc=2762,freq=1.0), product of:
              0.09351174 = queryWeight, product of:
                1.0597827 = boost
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.019500135 = queryNorm
              0.35351002 = fieldWeight in 2762, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                4.524928 = idf(docFreq=1273, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.061366264 = weight(abstract_txt:good in 2762) [ClassicSimilarity], result of:
            0.061366264 = score(doc=2762,freq=1.0), product of:
              0.1412453 = queryWeight, product of:
                1.3024791 = boost
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.019500135 = queryNorm
              0.43446586 = fieldWeight in 2762, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.561163 = idf(docFreq=451, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.06775864 = weight(abstract_txt:algorithms in 2762) [ClassicSimilarity], result of:
            0.06775864 = score(doc=2762,freq=1.0), product of:
              0.15089124 = queryWeight, product of:
                1.3462193 = boost
                5.747919 = idf(docFreq=374, maxDocs=43254)
                0.019500135 = queryNorm
              0.44905618 = fieldWeight in 2762, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.747919 = idf(docFreq=374, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.3287928 = weight(abstract_txt:genetic in 2762) [ClassicSimilarity], result of:
            0.3287928 = score(doc=2762,freq=4.0), product of:
              0.27244726 = queryWeight, product of:
                1.8089435 = boost
                7.7236013 = idf(docFreq=51, maxDocs=43254)
                0.019500135 = queryNorm
              1.2068127 = fieldWeight in 2762, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                7.7236013 = idf(docFreq=51, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.06744289 = weight(abstract_txt:terms in 2762) [ClassicSimilarity], result of:
            0.06744289 = score(doc=2762,freq=2.0), product of:
              0.15042211 = queryWeight, product of:
                1.9008796 = boost
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.019500135 = queryNorm
              0.44835752 = fieldWeight in 2762, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.058069 = idf(docFreq=2031, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.10737447 = weight(abstract_txt:query in 2762) [ClassicSimilarity], result of:
            0.10737447 = score(doc=2762,freq=2.0), product of:
              0.20509492 = queryWeight, product of:
                2.2196076 = boost
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.019500135 = queryNorm
              0.5235355 = fieldWeight in 2762, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                4.738502 = idf(docFreq=1028, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
          0.11782778 = weight(abstract_txt:queries in 2762) [ClassicSimilarity], result of:
            0.11782778 = score(doc=2762,freq=1.0), product of:
              0.29614156 = queryWeight, product of:
                2.9819713 = boost
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.019500135 = queryNorm
              0.39787653 = fieldWeight in 2762, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.0928197 = idf(docFreq=721, maxDocs=43254)
                0.078125 = fieldNorm(doc=2762)
        0.28 = coord(7/25)