How to resolve the algorithm Inverted index step by step in the J programming language

Published on 12 May 2024 09:40 PM
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How to resolve the algorithm Inverted index step by step in the J programming language

Table of Contents

Problem Statement

An Inverted Index is a data structure used to create full text search.

Given a set of text files, implement a program to create an inverted index. Also create a user interface to do a search using that inverted index which returns a list of files that contain the query term / terms. The search index can be in memory.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Inverted index step by step in the J programming language

Source code in the j programming language

require'files regex strings'

rxutf8 0  NB. support latin1 searches for this example, instead of utf8
files=:words=:buckets=:''
wordre=: rxcomp '[\w'']+'
parse=: ,@:rxfrom~ wordre&rxmatches

invert=: verb define
  files=: files,todo=. ~.y-.files
  >invert1 each todo
)

invert1=: verb define
  file=. files i.<y
  words=: ~.words,contents=. ~.parse tolower fread jpath y
  ind=. words i. contents
  buckets=: buckets,(1+words -&# buckets)#a:
  #buckets=: (file,~each ind{buckets) ind}buckets
)

search=: verb define
  hits=. buckets{~words i.~.parse tolower y
  files {~ >([-.-.)each/hits
)


   invert '~help/primer/cut.htm';'~help/primer/end.htm';'~help/primer/gui.htm'
   >search 'finally learning'
~help/primer/end.htm
~help/primer/gui.htm
   >search 'argument'
~help/primer/cut.htm
~help/primer/gui.htm
   >search 'around'
~help/primer/gui.htm

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