memoized the pattern function

interp/baker/__init__.py

@@ -204,6 +204,16 @@ def _samples_ur(items, k, offset = 0):
     selections = [[items[i]]*count for i,count in enumerate(sample)]
     yield tuple([x + offset  for sel in selections for x in sel])
 
+def memoize(f):
+  cache = {}
+  def memf(*x, **kargs):
+    if x not in cache:
+      print >>sys.stderr, x, kargs
+      cache[x] = f(*x, **kargs)
+    return cache[x]
+  return memf
+
+@memoize
 def pattern(power, phicount, offset = 0):
   log.debug("(power = %s, phicount = %s)" % (power, phicount))
   r = []