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POA little help needed in code translation (Python to C#)
 

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  1. POA little help needed in code translation (Python to C#)
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    <p>Good night everyone,</p> <p>This question leaves me a little embarassed because, of couse, I know I should be able to get the answer alone. However, my knowledge about Python is just a little bit more than nothing, so I need help from someone more experienced with it than me...</p> <p>The following code comes from <a href="http://norvig.com/ngrams" rel="nofollow">Norvig's "Natural Language Corpus Data"</a> chapter in a recently edited book, and it's about transforming a sentence "likethisone" into "[like, this, one]" (that means, segmenting the word correctly)...</p> <p>I have ported all of the code to C# (in fact, re-wrote the program by myself) except for the function <code>segment</code>, which I am having a lot of trouble even trying to understand it's syntax. Can someone please help me translating it to a more readable form in C#?</p> <p>Thank you very much in advance.</p> <pre><code>################ Word Segmentation (p. 223) @memo def segment(text): "Return a list of words that is the best segmentation of text." if not text: return [] candidates = ([first]+segment(rem) for first,rem in splits(text)) return max(candidates, key=Pwords) def splits(text, L=20): "Return a list of all possible (first, rem) pairs, len(first)&lt;=L." return [(text[:i+1], text[i+1:]) for i in range(min(len(text), L))] def Pwords(words): "The Naive Bayes probability of a sequence of words." return product(Pw(w) for w in words) #### Support functions (p. 224) def product(nums): "Return the product of a sequence of numbers." return reduce(operator.mul, nums, 1) class Pdist(dict): "A probability distribution estimated from counts in datafile." def __init__(self, data=[], N=None, missingfn=None): for key,count in data: self[key] = self.get(key, 0) + int(count) self.N = float(N or sum(self.itervalues())) self.missingfn = missingfn or (lambda k, N: 1./N) def __call__(self, key): if key in self: return self[key]/self.N else: return self.missingfn(key, self.N) def datafile(name, sep='\t'): "Read key,value pairs from file." for line in file(name): yield line.split(sep) def avoid_long_words(key, N): "Estimate the probability of an unknown word." return 10./(N * 10**len(key)) N = 1024908267229 ## Number of tokens Pw = Pdist(datafile('count_1w.txt'), N, avoid_long_words) </code></pre>
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    1. CODoes it have to be as dynamic as possible, or can you live with some static typing? Should functions translate 1 to 1?
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      1. USHamish Grubijan
    2. COI have every other function coded in C#. I just need the function "segment" in a way that it works as expected (whichever it may be). Thank you very much.
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    3. COCan you translate `return max(candidates, key=Pwords)`? This simply transforms every object into a number using `Pwords()` function and then finds a max of it. Now try to unroll `candidates = ([first]+segment(rem) for first,rem in splits(text))` from generator expression into a for loop. In fact, you can use the `yield return` trick.
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      1. POA little help needed in code translation (Python to C#)
      1. USHamish Grubijan
 

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