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fix_erased_mei - algorithm from Open-Tamil library
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# -*- coding: utf-8 -*- | |
# (C) 2020, முத்து அண்ணாமலை. | |
# இந்த நிரல் துண்டு MIT உரிமத்தில் வெளியிடப்பட்டது | |
import tamil | |
from pprint import pprint | |
import operator | |
from solthiruthi.scoring import bigram_scores, unigram_score | |
chol = tamil.utf8.get_letters("கணனன") | |
def mean(x): | |
return sum(x)/float(len(x)) | |
def pulligal_helper(prefix,letters): | |
if len(letters) == 0: return [prefix] | |
letter = letters[0] | |
result = [] | |
if letter in tamil.utf8.agaram_letters: | |
result1 = pulligal_helper( prefix + letter, letters[1:]) | |
mei_letter = letter + tamil.utf8.pulli_symbols[0] | |
result2 = pulligal_helper( prefix + mei_letter, letters[1:]) | |
result.extend(result1) | |
result.extend(result2) | |
else: | |
result1 = pulligal_helper( prefix + letter, letters[1:]) | |
result.extend(result1) | |
return result | |
def pulligal_branch_bound(prefix,letters,அகராதி): | |
""" we restrict options if its not a prefix in dictionary """ | |
if len(letters) == 0: return [prefix] | |
letter = letters[0] | |
result = [] | |
prefer = அகராதி.starts_with(prefix) | |
if letter in tamil.utf8.agaram_letters: | |
alternate2 = prefix + mei_letter | |
if அகராதி.starts_with(alternate2) or prefer: | |
mei_letter = letter + tamil.utf8.pulli_symbols[0] | |
result2 = pulligal_branch_bound( alternate2, letters[1:]) | |
result.extend(result2) | |
alternate1 = prefix + letter | |
if அகராதி.starts_with(alternate1) or prefer: | |
result1 = pulligal_branch_bound( alternate1, letters[1:]) | |
result.extend(result1) | |
return result | |
#sort in descending order | |
result_tpl = [("".join(sol),(-1.0*unigram_score(sol))) for sol in pulligal_helper("",chol)] | |
result_tpl = sorted(result_tpl,key=operator.itemgetter(1),reverse=True) | |
pprint(result_tpl) | |
""" | |
['கணனன', | |
'கணனன்', | |
'கணன்ன', | |
'கணன்ன்', | |
'கண்னன', | |
'கண்னன்', | |
'கண்ன்ன', | |
'கண்ன்ன்', | |
'க்ணனன', | |
'க்ணனன்', | |
'க்ணன்ன', | |
'க்ணன்ன்', | |
'க்ண்னன', | |
'க்ண்னன்', | |
'க்ண்ன்ன', | |
'க்ண்ன்ன்'] | |
#bigram score | |
[('கணனன', -12.834944378986375), | |
('கணனன்', -16.834944378986375), | |
('கணன்ன', -16.44297269239452), | |
('கணன்ன்', -20.44297269239452), | |
('கண்னன', -15.995814661052302), | |
('கண்னன்', -19.9958146610523), | |
('கண்ன்ன', -19.60384297446045), | |
('கண்ன்ன்', -23.60384297446045), | |
('க்ணனன', -17.231101404525926), | |
('க்ணனன்', -21.231101404525926), | |
('க்ணன்ன', -20.83912971793407), | |
('க்ணன்ன்', -24.83912971793407), | |
('க்ண்னன', -20.39197168659185), | |
('க்ண்னன்', -24.39197168659185), | |
('க்ண்ன்ன', -24.0), | |
('க்ண்ன்ன்', -28.0)] | |
# unigram score | |
[('கணனன', -7.5531477474850535), | |
('கணனன்', -8.553147747485053), | |
('கணன்ன', -8.553147747485053), | |
('கணன்ன்', -9.553147747485053), | |
('கண்னன', -8.553147747485053), | |
('கண்னன்', -9.553147747485053), | |
('கண்ன்ன', -9.553147747485053), | |
('கண்ன்ன்', -10.553147747485053), | |
('க்ணனன', -8.553147747485053), | |
('க்ணனன்', -9.553147747485053), | |
('க்ணன்ன', -9.553147747485053), | |
('க்ணன்ன்', -10.553147747485053), | |
('க்ண்னன', -9.553147747485053), | |
('க்ண்னன்', -10.553147747485053), | |
('க்ண்ன்ன', -10.553147747485053), | |
('க்ண்ன்ன்', -11.553147747485053)] | |
""" |
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