Class: Classifier::WordList

Inherits:
Object show all
Defined in:
lib/classifier/lsi/word_list.rb

Overview

This class keeps a word => index mapping. It is used to map stemmed words to dimensions of a vector.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ WordList

Returns a new instance of WordList.



14
15
16
 
# File 'lib/classifier/lsi/word_list.rb', line 14

def initialize
  @location_table = {}
end

Instance Method Details

#[](lookup) ⇒ Object

Returns the dimension of the word or nil if the word is not in the space.



29
30
31
32
 
# File 'lib/classifier/lsi/word_list.rb', line 29

def [](lookup)
  term = lookup
  @location_table[term]
end

#add_word(word) ⇒ Object

Adds a word (if it is new) and assigns it a unique dimension.



21
22
23
24
 
# File 'lib/classifier/lsi/word_list.rb', line 21

def add_word(word)
  term = word
  @location_table[term] = @location_table.size unless @location_table[term]
end

#size ⇒ Object

Returns the number of words mapped.



42
43
44
 
# File 'lib/classifier/lsi/word_list.rb', line 42

def size
  @location_table.size
end

#word_for_index(ind) ⇒ Object 



35
36
37
 
# File 'lib/classifier/lsi/word_list.rb', line 35

def word_for_index(ind)
  @location_table.invert[ind]
end