class PoissonUnigramPattern:
def __init__(self, K, morpheme_prior, gamma, delta, pattern_vocabulary):
self.morpheme_model = DirichletMultinomial(K-2, morpheme_prior) # -START, -STOP
self.length_model = GammaPoisson(gamma, delta)
self.vocabulary = pattern_vocabulary
def increment(self, pattern):
morphemes = self.vocabulary[pattern]
for morpheme in morphemes:
self.morpheme_model.increment(morpheme-2)
self.length_model.increment(len(morphemes)-1)
def decrement(self, pattern):
morphemes = self.vocabulary[pattern]
for morpheme in morphemes:
self.morpheme_model.decrement(morpheme-2)
self.length_model.decrement(len(morphemes)-1)
def prob(self, pattern):
morphemes = self.vocabulary[pattern]
return (prod(self.morpheme_model.prob(m) for m in morphemes) *
self.length_model.prob(len(morphemes)-1))
def log_likelihood(self, full=False):
return (self.morpheme_model.log_likelihood(full)
+ self.length_model.log_likelihood(full))
def resample_hyperparemeters(self, n_iter):
return self.morpheme_model.resample_hyperparemeters(n_iter)
def __repr__(self):
return ('PoissonUnigram(length ~ {self.length_model},'
' morph ~ {self.morpheme_model})').format(self=self)
class UniformUnigramPattern:
def __init__(self, K, gamma, delta, pattern_vocabulary):
self.morpheme_model = Uniform(K-3) # -START, -STOP, -STEM
self.length_model = GammaPoisson(gamma, delta)
self.vocabulary = pattern_vocabulary
def increment(self, pattern):
n_morphemes = len(self.vocabulary[pattern])
self.morpheme_model.count += n_morphemes-1
self.length_model.increment(n_morphemes-1)
def decrement(self, pattern):
n_morphemes = len(self.vocabulary[pattern])
self.morpheme_model.count -= n_morphemes-1
self.length_model.decrement(n_morphemes-1)
def prob(self, pattern):
n_morphemes = len(self.vocabulary[pattern])
morpheme_prob = 1./self.morpheme_model.K
return (morpheme_prob**(n_morphemes-1) *
self.length_model.prob(n_morphemes-1))
def log_likelihood(self, full=False):
return (self.morpheme_model.log_likelihood(full)
+ self.length_model.log_likelihood(full))
def resample_hyperparemeters(self, n_iter):
return self.morpheme_model.resample_hyperparemeters(n_iter)
def __repr__(self):
return ('UniformUnigram(length ~ {self.length_model},'
' morph ~ {self.morpheme_model})').format(self=self)
def __init__(self, K, morpheme_prior, gamma, delta, pattern_vocabulary):
self.morpheme_model = DirichletMultinomial(K-2, morpheme_prior) # -START, -STOP
self.length_model = GammaPoisson(gamma, delta)
self.vocabulary = pattern_vocabulary
def __init__(self, K, gamma, delta, pattern_vocabulary):
self.morpheme_model = Uniform(K-3) # -START, -STOP, -STEM
self.length_model = GammaPoisson(gamma, delta)
self.vocabulary = pattern_vocabulary
