chore: return a list of images from the infer function

app.py

@@ -21,11 +21,11 @@ def infer(test_image):
 	inv2_kernel = tf.reduce_sum(inv2_kernel, axis=[-1, -2, -3])
 	inv3_kernel = tf.reduce_sum(inv3_kernel, axis=[-1, -2, -3])
 
-	return (
+	return [
 		tf.keras.utils.array_to_img(inv1_kernel[0, ..., None]),
 		tf.keras.utils.array_to_img(inv2_kernel[0, ..., None]),
 		tf.keras.utils.array_to_img(inv3_kernel[0, ..., None]),
-	)
+	]
 
 # define the article
 article = """<center>