Changed scale of digits preview.

app.py

@@ -181,7 +181,7 @@ def plot_example(dataset):
         images = digits.images[:16]
         labels = digits.target[:16]
 
-        fig, axes = plt.subplots(4, 4, figsize=(8, 8))
+        fig, axes = plt.subplots(4, 4)
 
         for i, ax in enumerate(axes.flat):
             ax.imshow(images[i], cmap='gray')