Sophie: mnogosearch-3.3.8-3mdv2010.0 i586

mnogosearch-3.3.8-3mdv2010.0.i586.rpm

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>mnoGoSearch</SPAN
> 3.3.8 reference manual: Full-featured search engine software</TH
></TR
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>Chapter 10. Searching documents</TD
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><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="rel"
>Ranking documents
     <A
NAME="AEN5668"
></A
></A
></H1
><P
>By default, <SPAN
CLASS="application"
>mnoGoSearch</SPAN
> sorts
   results by <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>score</I
></SPAN
>.
   Score is calculated as <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>relevancy</I
></SPAN
>
   value mixed with various other factors listed in
   <A
HREF="msearch-rel.html#score-commands"
>the Section called <I
>Commands affecting document score
  <A
NAME="AEN5684"
></A
></I
></A
>.
   </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
     You can also request a non-default document ordering
     with help of the <TT
CLASS="literal"
>s</TT
> search parameter.
     Have a look into <A
HREF="msearch-doingsearch.html#search-params"
>the Section called <I
>Search parameters
    <A
NAME="AEN4282"
></A
></I
></A
>
     to know how to order documents by <TT
CLASS="literal"
>Date</TT
>,
     <TT
CLASS="literal"
>Popularity Rank</TT
>, <TT
CLASS="literal"
>URL</TT
>
     and other document parameters.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="score-commands"
>Commands affecting document score
  <A
NAME="AEN5684"
></A
></A
></H2
><P
>&#13;    Have a look into these manual sections to know about various commands
    that affect document ordering and/or score values:
    <A
HREF="msearch-cmdref-datefactor.html"
>DateFactor</A
>,
    <A
HREF="msearch-cmdref-docsizeweight.html"
>DocSizeWeight</A
>,
    <A
HREF="msearch-cmdref-mincoordfactor.html"
>MinCoordFactor</A
>,
    <A
HREF="msearch-cmdref-numdistinctwordfactor.html"
>NumDistinctWordFactor</A
>,
    <A
HREF="msearch-cmdref-numsections.html"
>NumSections</A
>,
    <A
HREF="msearch-cmdref-numwordfactor.html"
>NumWordFactor</A
>,
    <A
HREF="msearch-cmdref-userscore.html"
>UserScore</A
>,
    <A
HREF="msearch-cmdref-worddistanceweight.html"
>WordDistanceWeight</A
>,
    <A
HREF="msearch-cmdref-wordformfactor.html"
>WordFormFactor</A
>,
    <A
HREF="msearch-cmdref-worddensityfactor.html"
>WordDensityFactor</A
>.
  </P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="relevancy"
>Relevancy</A
></H2
><P
>Relevancy for every found document is calculated as
  the cosine of the angle formed by two weights vectors,
  the vector for the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>search query</I
></SPAN
> and
  the vector for the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>found document</I
></SPAN
>.
  The number of coordinates in the vectors is equal to the number
  of the words in the search query (<TT
CLASS="literal"
>NumWords</TT
>)
  multiplied by the number of the active sections, defined by the
  <B
CLASS="command"
><A
HREF="msearch-cmdref-numsections.html"
>NumSections</A
></B
> command:
  <TT
CLASS="literal"
>NumWords * NumSections</TT
>.
  Every coordinate in the vector corresponds to one word in one section,
  the coordinate value consists of thee factors:
  <P
></P
><UL
><LI
><P
>&#13;       <TT
CLASS="literal"
>section_weight</TT
>, according to the
      <B
CLASS="command"
><A
HREF="msearch-cmdref-wf.html"
>wf</A
></B
> value
      for this section (see <A
HREF="msearch-doingsearch.html#search-changeweight"
>the Section called <I
>Changing weights of the different document parts at search time</I
></A
>).
      </P
></LI
><LI
><P
>&#13;       <TT
CLASS="literal"
>word_weight</TT
>, depending on whether this word
      is the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>original word</I
></SPAN
> from the search query typed by
      the user, or the word is a generated form such as
      a <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>synonym</I
></SPAN
> or a <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>stemming form</I
></SPAN
>.
      </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
        You can change the weight of the generated forms
        using the <B
CLASS="command"
><A
HREF="msearch-cmdref-wordformfactor.html"
>WordFormFactor</A
></B
>
        command.
        </P
></BLOCKQUOTE
></DIV
></LI
><LI
><P
>&#13;      <TT
CLASS="literal"
>word_frequency</TT
> - the frequency of the
      word in the section, with the
      <B
CLASS="command"
><A
HREF="msearch-cmdref-worddensityfactor.html"
>WordDensityFactor</A
></B
>
      value taken into account.
      </P
></LI
></UL
>
  Imagine we typed the search query ``<KBD
CLASS="userinput"
>test document</KBD
>''
  in the search form, and search returned this <ACRONYM
CLASS="acronym"
>HTML</ACRONYM
>
  document among the other results:
<PRE
CLASS="programlisting"
>&#13;&#60;HTML&#62;
  &#60;HEAD&#62;
    &#60;TITLE&#62;
      Test
    &#60;/TITLE&#62;
  &#60;/HEAD&#62;
  &#60;BODY&#62;
    This is a test document to test the score value 
  &#60;/BODY&#62;
&#60;/HTML&#62;
</PRE
>
  Also, for similicity reasons, imagine that
  <B
CLASS="command"
><A
HREF="msearch-cmdref-numsections.html"
>NumSections</A
></B
> is set
  to <TT
CLASS="literal"
>2</TT
> (that is only the <TT
CLASS="literal"
>body</TT
> and 
  <TT
CLASS="literal"
>title</TT
> sections are active),
  <B
CLASS="command"
><A
HREF="msearch-cmdref-wf.html"
>wf</A
></B
> is set to
  its default value (weight factors for alls sections are
  equal to <TT
CLASS="literal"
>1</TT
>), and
  <B
CLASS="command"
><A
HREF="msearch-cmdref-worddensityfactor.html"
>WordDensityFactor</A
></B
>
  is set to <TT
CLASS="literal"
>255</TT
> (the strongest density effect).
  </P
><P
>&#13;  <SPAN
CLASS="application"
>mnoGoSearch</SPAN
> will use these two vectors
  to calculate relevancy:
<PRE
CLASS="programlisting"
>&#13;  Vq= (1, 1, 1, 1)
</PRE
>
for the search query
and
<PRE
CLASS="programlisting"
>&#13;  Vd= (1, 0, 0.2, 0.1)
</PRE
>
for the above document, calculated as follows:
    <P
></P
><UL
><LI
><P
>&#13;        The word <TT
CLASS="literal"
>test</TT
> appears once in the section
        <TT
CLASS="literal"
>title</TT
> and its <TT
CLASS="literal"
>word_frequency</TT
>
        is <TT
CLASS="literal"
>1</TT
>,
        <CODE
CLASS="varname"
>wf[title]</CODE
>=<TT
CLASS="literal"
>1</TT
>,
        <CODE
CLASS="varname"
>word_weight</CODE
>=<TT
CLASS="literal"
>1</TT
>.
        Therefore, <CODE
CLASS="varname"
>Vd[1]</CODE
>=<TT
CLASS="literal"
>1 * 1 * 1</TT
> =
        <TT
CLASS="literal"
>1</TT
>.
        </P
></LI
><LI
><P
>&#13;        The word <TT
CLASS="literal"
>document</TT
> does not appear
        in the section <TT
CLASS="literal"
>title</TT
> at all,
        therefore, <CODE
CLASS="varname"
>Vd[2]</CODE
>=<TT
CLASS="literal"
>0</TT
>.
        </P
></LI
><LI
><P
>&#13;        The word <TT
CLASS="literal"
>test</TT
> appears two times in the section
        <TT
CLASS="literal"
>body</TT
>, with <TT
CLASS="literal"
>10</TT
>
        words total. <TT
CLASS="literal"
>word_frequency</TT
>
        is <TT
CLASS="literal"
>2/10</TT
>.
        <CODE
CLASS="varname"
>wf[body]</CODE
> is <TT
CLASS="literal"
>1</TT
>.
        <CODE
CLASS="varname"
>word_weight</CODE
> is <TT
CLASS="literal"
>1</TT
>.
        Therefore, <CODE
CLASS="varname"
>Vd[3]</CODE
> = <TT
CLASS="literal"
>2/10 * 1 * 1</TT
> = <TT
CLASS="literal"
>0.2</TT
>.
        </P
></LI
><LI
><P
>&#13;        The word <TT
CLASS="literal"
>document</TT
> appears once in the section
        <TT
CLASS="literal"
>body</TT
> which is total <TT
CLASS="literal"
>10</TT
>
        words long. <TT
CLASS="literal"
>word_frequency</TT
>
        is <TT
CLASS="literal"
>1/10</TT
>.
        <CODE
CLASS="varname"
>wf[body]</CODE
> is <TT
CLASS="literal"
>1</TT
>.
        <CODE
CLASS="varname"
>word_weight</CODE
> is <TT
CLASS="literal"
>1</TT
>.
        Therefore, <CODE
CLASS="varname"
>Vd[4]</CODE
> = <TT
CLASS="literal"
>1/10 * 1 * 1</TT
> = <TT
CLASS="literal"
>0.1</TT
>.
        </P
></LI
></UL
>
  </P
><P
>&#13;  The cosine value value for the above two vectors is
  <TT
CLASS="literal"
>0.634335</TT
>.
  </P
><P
>&#13;  Now imagine that we set <CODE
CLASS="varname"
>wf</CODE
> to "<TT
CLASS="literal"
>1111181</TT
>"
  and therefore made the weight factor for the section
  <TT
CLASS="literal"
>title</TT
> higher. Now relevancy will be calculated
  using these two vectors:
<PRE
CLASS="programlisting"
>&#13;  Vq= (8, 8, 1, 1)
</PRE
>
for the search query
and
<PRE
CLASS="programlisting"
>&#13;  Vd= (8, 0, 0.2, 0.1)
</PRE
>
for the above document, which will result in
the relevancy value <TT
CLASS="literal"
>0.704660</TT
>.
  </P
><P
>&#13;  The relevancy value calculated as explained above
  is further mixed with various other parameters
  to get the final <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>score</I
></SPAN
> value,
  for example the average distance between
  the words in the document, the distance of
  the words from the beginning of the section,
  and the other parameters listed in
  <A
HREF="msearch-rel.html#score-commands"
>the Section called <I
>Commands affecting document score
  <A
NAME="AEN5684"
></A
></I
></A
>.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
    In the default configuration
    <SPAN
CLASS="application"
>mnoGoSearch</SPAN
> produces quite small score values,
    because it expects the words to be found in up to <TT
CLASS="literal"
>256</TT
> 
    sections and therefore uses the <TT
CLASS="literal"
>256</TT
> coordinate
    vectors. Have a look into <A
HREF="msearch-cmdref-numsections.html"
>NumSections</A
>
    <TT
CLASS="filename"
>search.htm</TT
> command description how to specify
    the real number of sections and thus increase the score values.
    Changing <A
HREF="msearch-cmdref-numsections.html"
>NumSections</A
>  does not affect
    the document order, it only changes the absolute score values
    for all documents.
    </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="score-debug"
>Analyzing score values</A
></H2
><P
>Starting from the version <TT
CLASS="literal"
>3.3.7</TT
>,
  <SPAN
CLASS="application"
>mnoGoSearch</SPAN
>
  allows to debug score values calculated for the documents found
  and thus helps to find a combination of all score factors
  which is the best for you.
  
  In order to debug score values go through these steps:
    <P
></P
><OL
TYPE="1"
><LI
>Add this code into the bottom of the
        <TT
CLASS="literal"
>&#60;!--restop--&#62;</TT
>section of your search template:
        <PRE
CLASS="programlisting"
>&#13;&#60;--restop--&#62;
....
[DebugScore: $(DebugScore)]
&#60;--/restop--&#62;
        </PRE
></LI
><LI
>Add this code into the bottom of the
        <TT
CLASS="literal"
>&#60;!--res--&#62;</TT
>section of your search template:
        <PRE
CLASS="programlisting"
>&#13;&#60;--res--&#62;
....
[ID=$(ID)]
&#60;--/res--&#62;
        </PRE
></LI
><LI
>Open <SPAN
CLASS="application"
>search.cgi</SPAN
>in your browser and
        run some search query consisting of multiple words.
        You will additionally see the document IDs after
        the usual document information.
      </LI
><LI
>Choose a document you want to see the debug information for.
        Remember its ID (let's say the ID is 100).
      </LI
><LI
>Go to your browser's location bar, add
      <B
CLASS="command"
>&#38;DebugURLID=100</B
>at the very end of the URL and press Enter.
      <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
        Now URL will look approximately like this:
          <PRE
CLASS="programlisting"
>&#13;http://hostname/cgi-bin/search.cgi?q=test+query&#38;DebugURLID=100
          </PRE
>
        </P
></BLOCKQUOTE
></DIV
></LI
><LI
>Find a line of this format in between the search form and the results:
        <PRE
CLASS="programlisting"
>&#13;DebugScore: url_id=100 RDsum=98 distance=84 (84/1) minmax=0.99091089
            density=0.00196271 numword=0.90135133 wordform=0.00000000
        </PRE
>It will give you an idea why the score value for the
        selected document is too high or too low and help
        to fine tune various parameters
        like <A
HREF="msearch-cmdref-worddistanceweight.html"
>WordDistanceWeight</A
>
        or  <A
HREF="msearch-cmdref-worddensityfactor.html"
>WordDensityFactor</A
>.
      </LI
></OL
>
    <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      Score debug information is currently displayed only for
      queries with multiple search words.
      Queries with a single search word don't return debug information.
      </P
></BLOCKQUOTE
></DIV
>
  </P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="poprank"
>Popularity rank<A
NAME="AEN5842"
></A
></A
></H2
><P
>&#13;  <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Popularity rank</I
></SPAN
> is calculated when
  you start <KBD
CLASS="userinput"
>indexer -n0 -R</KBD
> and is done in two steps.
  </P
><P
>&#13;  At the first step, the value of the <CODE
CLASS="option"
>Weight</CODE
> parameter
  for every server is divided by the number of outgoing links from
  this server, so the weight of one link from this server is calculated.
  At the second step the sum of weights of all incoming links is
  calculated for every document and the result is stored as the document
  popularity value.
  </P
><P
>&#13;  Self-links (when a document refers to itself),
  are ignored and do not affect the document popularity.
  You can also set  <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankskipsamesite.html"
>PopRankSkipSameSite</A
></B
>
  to <TT
CLASS="literal"
>yes</TT
> to ignore all internal site links and
  thus have only inter-site links affect the popularity values.
  </P
><P
><A
NAME="AEN5854"
></A
>
  By default, the value of the <CODE
CLASS="option"
>Weight</CODE
> parameter is equal
  to <TT
CLASS="literal"
>1</TT
> for all servers. You can change this value using
  the <B
CLASS="command"
><A
HREF="msearch-cmdref-serverweight.html"
>ServerWeight</A
></B
>
  command in <TT
CLASS="filename"
>indexer.conf</TT
>.
  
  </P
><P
>If you put set <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankfeedback.html"
>PopRankFeedBack</A
></B
>
  to <TT
CLASS="literal"
>yes</TT
>, <SPAN
CLASS="application"
>indexer</SPAN
> will
  re-calculate site weights before calculating popularity values.
  A site weight is calculated as the sum of popularity values
  for all document of this site calculated during
  the previous <KBD
CLASS="userinput"
>indexer -n0 -R</KBD
> run.
  If the sum is greater than <TT
CLASS="literal"
>1</TT
>,
  the site weight is set to this sum, otherwise,
  the site weight is set to <TT
CLASS="literal"
>1</TT
>.
  </P
><P
>If you set <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankusetracking.html"
>PopRankUseTracking</A
></B
>
  to <TT
CLASS="literal"
>yes</TT
>, <SPAN
CLASS="application"
>indexer</SPAN
> will also
  use the search statistics collected using
  the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>search query tracking</I
></SPAN
> module
  (see  <A
HREF="msearch-track.html"
>the Section called <I
>Tracking search queries
    <A
NAME="AEN5917"
></A
></I
></A
> for details).
  </P
><P
>If you set <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankuseshowcnt.html"
>PopRankUseShowCnt</A
></B
>
  to <TT
CLASS="literal"
>yes</TT
> in the search template file
  <TT
CLASS="filename"
>search.htm</TT
>, the <CODE
CLASS="varname"
>url.shows</CODE
>
  value (that is the value of the column <CODE
CLASS="varname"
>show</CODE
> in the 
  table <CODE
CLASS="varname"
>url</CODE
>) will be incremented every
  time a document is displayed in search results, but only in the case
  when the score value of the document is greater than
  <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankshowcntratio.html"
>PopRankShowCntRatio</A
></B
>
  (<TT
CLASS="literal"
>25.0%</TT
> by default). That is, this option
  activates collecting information about the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>high scored</I
></SPAN
>
  documents <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>seen</I
></SPAN
> by the users.
  </P
><P
>&#13;  You can set <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankuseshowcnt.html"
>PopRankUseShowCnt</A
></B
>
  to <TT
CLASS="literal"
>yes</TT
> in <TT
CLASS="filename"
>indexer.conf</TT
>.
  In this case <B
CLASS="command"
>indexer</B
> will use the collected
  value of <CODE
CLASS="varname"
>url.shows</CODE
> multiplied to the
  <B
CLASS="command"
><A
HREF="msearch-cmdref-poprankshowcntweight.html"
>PopRankShowCntWeight</A
></B
>
  (<TT
CLASS="literal"
>0.01</TT
> by default) to the popularity value.
  </P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="rel-cwords"
>Crosswords<A
NAME="AEN5902"
></A
></A
></H2
><P
>This feature makes the words written in between
  the <TT
CLASS="literal"
>&#60;a href="xxx"&#62;</TT
> and <TT
CLASS="literal"
>&#60;/a&#62;</TT
>
  <ACRONYM
CLASS="acronym"
>HTML</ACRONYM
> tags belong to the document referenced in the link. 
  To enable using Crosswords,
  use the <B
CLASS="command"
><A
HREF="msearch-cmdref-crosswords.html"
>CrossWords</A
>
  <A
NAME="AEN5910"
></A
>
  </B
> command in  <TT
CLASS="filename"
>indexer.conf</TT
> and
  <TT
CLASS="filename"
>search.htm</TT
>.
  </P
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
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