Update app.py

app.py

@@ -52,7 +52,7 @@ def evaluate(transformer, question, question_mask, max_len, word_map):
 
 
 if load_checkpoint:
-    checkpoint = torch.load(ckpt_path)
+    checkpoint = torch.load(ckpt_path, map_location=torch.device('cpu'))
     transformer = checkpoint['transformer']