ngrams-loader

Ngrams loader based on http://www.ngrams.info format

Installation

Supposed you have at least cabal 1.18 installed

$ cabal sandbox init
$ cabal install --only-dependencies
$ cabal configure
$ cabal install

-- program located in ~/.cabal-sandbox/bin

Usage

usage: ngrams-loader [options] <n-grams file> <SQLite file>
  [-2,--bigram]     Parses bigrams
  [-3,--trigram]    Parses trigrams
  [-4,--quadgram]   Parses 4-grams
  [-5,--pentagram]  Parses 5-grams
  [-c,--create]     Creates table before inserts
  <n-grams file>    N-grams file
  <SQLite file>     SQlite db file

Example

ngrams-loader --bigram --create w2.txt bigram.db

It parses each line of w2.txt as a bigram, create bigram table before performing inserts and saves everything in bigram.db

Figures

Specs

• Core i7 3770 @ 3.4GHz
• Gentoo with 3.12.13 Linux kernel (64bits)
• 1.055.386 lines bigram file

ngrams-loader --bigram --create w2.txt bigram.db gets

real    0m16.244s
user    0m15.597s
sys   0m0.143s

Sql Schemas

Bigram

create table bigrams(
  frequence int,
  word1 varchar(100),
  word2 varchar(100)
);

Trigram

create table tridgrams(
  frequence int,
  word1 varchar(100),
  word2 varchar(100),
  word3 varchar(100)
);

4-gram

create table quadgrams(
  frequence int,
  word1 varchar(100),
  word2 varchar(100),
  word3 varchar(100),
  word4 varchar(100)
);

5-gram

create table pentagrams(
  frequence int,
  word1 varchar(100),
  word2 varchar(100),
  word3 varchar(100),
  word4 varchar(100),
  word5 varchar(100)
);