Move constant instruction out of a nested loop

scripts/confusionMatrices.py

@@ -28,9 +28,9 @@ def __syntax(this):
     sys.exit(1)
 
 def __compute(sourcePath, ns, ranksToTry, metricNames, outputDir):
+    source = data.load(sourcePath)
     for n in ns:
         for ranks in ranksToTry:
-            source = data.load(sourcePath)
             vectorizer = topNGrams(source, n, ranks)
             for name in metricNames:
                 imagePath = preparePath(outputDir, source, n, ranks, name)