Add str() to variables being printed

I realized that the variables weren't strings despite having "%s" (I thought the "s" meant string) in Python 2. That is what you get for only dealing with Python 3. :P

mnist_svm.py

@@ -21,7 +21,7 @@ def svm_baseline():
     predictions = [int(a) for a in clf.predict(test_data[0])]
     num_correct = sum(int(a == y) for a, y in zip(predictions, test_data[1]))
     print("Baseline classifier using an SVM.")
-    print(num_correct + " of " + len(test_data[1]) + " values correct.")
+    print(str(num_correct) + " of " + str(len(test_data[1])) + " values correct.")
 
 if __name__ == "__main__":
     svm_baseline()