X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=segment.py;h=bd15e00e41913aa5115da546fb70215143341df2;hb=1635c5915dc678efd90fffc5cb01c8f4bede9f47;hp=08bc0aa84244bf222655defba7b4a0773f87ebcf;hpb=a5bada5fbdbfa67a1f4c301c5e14897c268bc0a5;p=cipher-tools.git

diff --git a/segment.py b/segment.py
index 08bc0aa..bd15e00 100644
--- a/segment.py
+++ b/segment.py
@@ -4,19 +4,10 @@ import collections
 from math import log10
 import itertools
 import sys
+from functools import lru_cache
 sys.setrecursionlimit(1000000)
 
-def memo(f):
-    "Memoize function f."
-    table = {}
-    def fmemo(*args):
-        if args not in table:
-            table[args] = f(*args)
-        return table[args]
-    fmemo.memo = table
-    return fmemo
-
-@memo
+@lru_cache()
 def segment(text):
     """Return a list of words that is the best segmentation of text.
     """
@@ -33,7 +24,7 @@ def splits(text, L=20):
 def Pwords(words): 
     """The Naive Bayes log probability of a sequence of words.
     """
-    return sum(Pw[w] for w in words)
+    return sum(Pw[w.lower()] for w in words)
 
 class Pdist(dict):
     """A probability distribution estimated from counts in datafile.