fixed line 42

cnn.py

@@ -39,7 +39,7 @@ def accuracy(labels, pred, k=1):
             loss: average cross_entropy loss over batch (scalar)
     '''
     labels = np.argmax(labels, axis=-1)
-    pred = np.argmax(labels, axis=-1)
+    pred = np.argmax(pred, axis=-1)
     
     return np.mean(pred == labels)