add web demo

Former-commit-id: 25ea647e5ac36b497b8e176b123fdee39be3fd30

src/web_demo.py

@@ -0,0 +1,44 @@
+# coding=utf-8
+# Implements user interface in browser for fine-tuned models.
+# Usage: python web_demo.py --model_name_or_path path_to_model --checkpoint_dir path_to_checkpoint
+
+import gradio as gr
+from transformers.utils.versions import require_version
+
+from llmtuner import get_infer_args
+from llmtuner.webui.chat import WebChatModel
+from llmtuner.webui.components.chatbot import create_chat_box
+from llmtuner.webui.manager import Manager
+
+
+require_version("gradio>=3.36.0", "To fix: pip install gradio>=3.36.0")
+
+
+def main():
+    chat_model = WebChatModel(*get_infer_args())
+
+    with gr.Blocks(title="Web Demo") as demo:
+        lang = gr.Dropdown(choices=["en", "zh"], value="en")
+
+        _, _, _, chat_elems = create_chat_box(chat_model, visible=True)
+
+        manager = Manager([{"lang": lang}, chat_elems])
+
+        demo.load(
+            manager.gen_label,
+            [lang],
+            [lang] + [elem for elem in chat_elems.values()],
+        )
+
+        lang.change(
+            manager.gen_label,
+            [lang],
+            [lang] + [elem for elem in chat_elems.values()],
+        )
+
+    demo.queue()
+    demo.launch(server_name="0.0.0.0", share=False, inbrowser=True)
+
+
+if __name__ == "__main__":
+    main()