diff --git a/fastchat/model/model_registry.py b/fastchat/model/model_registry.py
index df4a58e2b..19a513eaa 100644
--- a/fastchat/model/model_registry.py
+++ b/fastchat/model/model_registry.py
@@ -23,7 +23,9 @@ def get_model_info(name: str) -> ModelInfo:
         return model_info[name]
     else:
         # To fix this, please use `register_model_info` to register your model
-        return ModelInfo(name, "", "Register the description at fastchat/model/model_registry.py")
+        return ModelInfo(
+            name, "", "Register the description at fastchat/model/model_registry.py"
+        )
 
 
 register_model_info(
diff --git a/fastchat/serve/gradio_web_server.py b/fastchat/serve/gradio_web_server.py
index 2c5a54850..02b737db7 100644
--- a/fastchat/serve/gradio_web_server.py
+++ b/fastchat/serve/gradio_web_server.py
@@ -655,7 +655,9 @@ def build_single_model_ui(models, add_promotion_links=False):
         [state, chatbot] + btn_list,
     )
     send_btn.click(
-        add_text, [state, model_selector, textbox], [state, chatbot, textbox] + btn_list,
+        add_text,
+        [state, model_selector, textbox],
+        [state, chatbot, textbox] + btn_list,
     ).then(
         bot_response,
         [state, temperature, top_p, max_output_tokens],
@@ -690,7 +692,7 @@ def build_demo(models):
                 state,
                 model_selector,
             ],
-            _js=load_js
+            _js=load_js,
         )
 
     return demo
@@ -725,8 +727,9 @@ def build_demo(models):
         help="Whether to load the model list once or reload the model list every time",
     )
     parser.add_argument(
-        "--moderate", action="store_true",
-        help="Enable content moderation to block unsafe inputs"
+        "--moderate",
+        action="store_true",
+        help="Enable content moderation to block unsafe inputs",
     )
     parser.add_argument(
         "--show-terms-of-use",
diff --git a/fastchat/serve/gradio_web_server_multi.py b/fastchat/serve/gradio_web_server_multi.py
index 96ad60106..92618d911 100644
--- a/fastchat/serve/gradio_web_server_multi.py
+++ b/fastchat/serve/gradio_web_server_multi.py
@@ -112,7 +112,9 @@ def build_demo(models, elo_results_file, leaderboard_table_file):
                 side_by_side_named_list = build_side_by_side_ui_named(models)
 
             with gr.Tab("Single Model", id=2):
-                single_model_list = build_single_model_ui(models, add_promotion_links=True)
+                single_model_list = build_single_model_ui(
+                    models, add_promotion_links=True
+                )
 
             if elo_results_file:
                 with gr.Tab("Leaderboard", id=3):
@@ -131,7 +133,10 @@ def build_demo(models, elo_results_file, leaderboard_table_file):
         demo.load(
             load_demo,
             [url_params],
-            [tabs] + single_model_list + side_by_side_anony_list + side_by_side_named_list,
+            [tabs]
+            + single_model_list
+            + side_by_side_anony_list
+            + side_by_side_named_list,
             _js=load_js,
         )
 
@@ -167,8 +172,9 @@ def build_demo(models, elo_results_file, leaderboard_table_file):
         help="Whether to load the model list once or reload the model list every time.",
     )
     parser.add_argument(
-        "--moderate", action="store_true",
-        help="Enable content moderation to block unsafe inputs"
+        "--moderate",
+        action="store_true",
+        help="Enable content moderation to block unsafe inputs",
     )
     parser.add_argument(
         "--show-terms-of-use",
@@ -206,8 +212,12 @@ def build_demo(models, elo_results_file, leaderboard_table_file):
         help='Set the gradio authentication file path. The file should contain one or more user:password pairs in this format: "u1:p1,u2:p2,u3:p3"',
         default=None,
     )
-    parser.add_argument("--elo-results-file", type=str, help="Load leaderboard results and plots")
-    parser.add_argument("--leaderboard-table-file", type=str, help="Load leaderboard results and plots")
+    parser.add_argument(
+        "--elo-results-file", type=str, help="Load leaderboard results and plots"
+    )
+    parser.add_argument(
+        "--leaderboard-table-file", type=str, help="Load leaderboard results and plots"
+    )
     args = parser.parse_args()
     logger.info(f"args: {args}")
 
diff --git a/fastchat/serve/monitor/summarize_cluster.py b/fastchat/serve/monitor/summarize_cluster.py
index 8c5047623..1d5fbcddc 100644
--- a/fastchat/serve/monitor/summarize_cluster.py
+++ b/fastchat/serve/monitor/summarize_cluster.py
@@ -42,8 +42,11 @@ def truncate_string(s, l):
         instruct = "Given a list of user messages, use less than 8 words to summarize a central topic for all messages in English. Your output should only include a single line. Try to be specific."
         split = int(args.num_prompts * 0.8)
         prompt = "\n".join(
-            [truncate_string(x, l=200) for x in topk_prompts[: split]] + 
-            [truncate_string(x, l=200) for x in random_prompts[: args.num_prompts - split]]
+            [truncate_string(x, l=200) for x in topk_prompts[:split]]
+            + [
+                truncate_string(x, l=200)
+                for x in random_prompts[: args.num_prompts - split]
+            ]
         )
         prompt = "BEGIN OF THE MESSAGE LIST\n" + prompt + "\nEND OF THE MESSAGE LIST."