def q4_calculate_oov_rate_for_reuters_test_with_respect_to_training():
training = ReutersTrainingCorpus()
test = ReutersTestCorpus()
oov_calculator = OutOfVocabularyRateCalculator()
oov_rate = oov_calculator.calculate_out_of_vocabulary_rate(training, test)
print("Out of vocabulary rate: ", oov_rate)
def q4_calculate_oov_rate_for_reuters_test_with_respect_to_training():
training = ReutersTrainingCorpus()
test = ReutersTestCorpus()
oov_calculator = OutOfVocabularyRateCalculator()
oov_rate = oov_calculator.calculate_out_of_vocabulary_rate(training, test)
print("Out of vocabulary rate: ", oov_rate)
def q7_perplexity_oov_of_brown_corpus():
training = ReutersTrainingCorpus()
brown = BrownCorpus()
lambdas = [0.2518, 0.4691, 0.2791]
calculator = InterpolatingNgramProbabilityCalculator(NgramCalculatorContainer(training, 3), lambdas)
language_model = NgramLanguageModel(training, 3, ngram_probability_calculator=calculator)
perplexity = PerplexityCalculator().calculate_corpus_perplexity(language_model, brown)
oov_calculator = OutOfVocabularyRateCalculator()
oov_rate = oov_calculator.calculate_out_of_vocabulary_rate(training, brown)
print("Brown perplexity best model: ", perplexity)
print("Brown out of vocabulary rate: ", oov_rate)
def q7_perplexity_oov_of_brown_corpus():
training = ReutersTrainingCorpus()
brown = BrownCorpus()
lambdas = [0.2518, 0.4691, 0.2791]
calculator = InterpolatingNgramProbabilityCalculator(
NgramCalculatorContainer(training, 3), lambdas)
language_model = NgramLanguageModel(
training, 3, ngram_probability_calculator=calculator)
perplexity = PerplexityCalculator().calculate_corpus_perplexity(
language_model, brown)
oov_calculator = OutOfVocabularyRateCalculator()
oov_rate = oov_calculator.calculate_out_of_vocabulary_rate(training, brown)
print("Brown perplexity best model: ", perplexity)
print("Brown out of vocabulary rate: ", oov_rate)
class TestOutOfVocabularyRateCalculator:
training_corpus = [
['how', 'many', 'roads', 'must', 'a', 'man', 'walk', 'down'],
['before', 'you', 'call', 'him', 'a', 'man'],
['how', 'many', 'seas', 'must', 'a', 'white', 'dove', 'sail'],
['before', 'she', 'sleeps', 'in', 'the', 'sand']
]
test_corpus = [
['yes', 'and', 'how', 'many', 'times', 'must', 'the', 'cannon', 'balls', 'fly'],
['before', "they're", 'forever', 'banned'],
['the', 'answer', 'my', 'friend', 'is', "blowin'", 'in', 'the', 'wind'],
['the', 'answer', 'is', "blowin'", 'in', 'the', 'wind']
]
calculator = OutOfVocabularyRateCalculator()
def test_calculate_out_of_vocabulary_rate(self):
assert 19/30 == self.calculator.calculate_out_of_vocabulary_rate(Corpus(self.training_corpus),
Corpus(self.test_corpus))
