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Jednostránkový spell checker napsaný v letadle (od P.Norviga)

  1. Pěkný experiment
    http://norvig.com/spell-correct.html

    Kód:
    import re, collections
    
    def words(text): return re.findall('[a-z]+', text.lower()) 
    
    def train(features):
        model = collections.defaultdict(lambda: 1)
        for f in features:
            model[f] += 1
        return model
    
    NWORDS = train(words(file('big.txt').read()))
    
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    
    def edits1(word):
       splits     = [(word[:i], word[i:]) for i in range(len(word) + 1)]
       deletes    = [a + b[1:] for a, b in splits if b]
       transposes = [a + b[1] + b[0] + b[2:] for a, b in splits if len(b)>1]
       replaces   = [a + c + b[1:] for a, b in splits for c in alphabet if b]
       inserts    = [a + c + b     for a, b in splits for c in alphabet]
       return set(deletes + transposes + replaces + inserts)
    
    def known_edits2(word):
        return set(e2 for e1 in edits1(word) for e2 in edits1(e1) if e2 in NWORDS)
    
    def known(words): return set(w for w in words if w in NWORDS)
    
    def correct(word):
        candidates = known([word]) or known(edits1(word)) or known_edits2(word) or [word]
        return max(candidates, key=NWORDS.get)
    (Poznámka pro sebe: Musím se podívat na code higlighter pro Python a další)

  2. Co se právě děje na Webtrhu?
  3. moc pekny :)

    jeste tam domatlat markovuv model (pravdepodobnost predchoziho/nasledujiciho slova vety) a mohlo by to bejt i celkem pouzitelny.

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