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Added Default Parameter to Support Smoothing in ngram model #246

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Merged
norvig merged 1 commit into from
Sep 7, 2016
Merged

Added Default Parameter to Support Smoothing in ngram model #246

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4 changes: 2 additions & 2 deletions text.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,10 +32,10 @@ class NgramTextModel(CountingProbDist):
You can add, sample or get P[(word1, ..., wordn)]. The method P.samples(n)
builds up an n-word sequence; P.add and P.add_sequence add data."""

def __init__(self, n, observation_sequence=[]):
def __init__(self, n, observation_sequence=[], default=0):
# In addition to the dictionary of n-tuples, cond_prob is a
# mapping from (w1, ..., wn-1) to P(wn | w1, ... wn-1)
CountingProbDist.__init__(self)
CountingProbDist.__init__(self, default=default)
self.n = n
self.cond_prob = defaultdict()
self.add_sequence(observation_sequence)
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