[cli] support lazy import (#9217)

Co-authored-by: frozenleaves <frozen@Mac.local>

src/llamafactory/cli.py

@@ -35,16 +35,46 @@ USAGE = (
 )
 
 
+def _run_api():
+    from .api.app import run_api
+    return run_api()
+
+
+def _run_chat():
+    from .chat.chat_model import run_chat
+    return run_chat()
+
+
+def _run_eval():
+    from .eval.evaluator import run_eval
+    return run_eval()
+
+
+def _export_model():
+    from .train.tuner import export_model
+    return export_model()
+
+
+def _run_exp():
+    from .train.tuner import run_exp
+    return run_exp()
+
+
+def _run_web_demo():
+    from .webui.interface import run_web_demo
+    return run_web_demo()
+
+
+def _run_web_ui():
+    from .webui.interface import run_web_ui
+    return run_web_ui()
+
+
 def main():
     from . import launcher
-    from .api.app import run_api
-    from .chat.chat_model import run_chat
-    from .eval.evaluator import run_eval
     from .extras import logging
     from .extras.env import VERSION, print_env
     from .extras.misc import find_available_port, get_device_count, is_env_enabled, use_ray
-    from .train.tuner import export_model, run_exp
-    from .webui.interface import run_web_demo, run_web_ui
 
     logger = logging.get_logger(__name__)
 
@@ -61,14 +91,14 @@ def main():
     )
 
     COMMAND_MAP = {
-        "api": run_api,
-        "chat": run_chat,
+        "api": _run_api,
+        "chat": _run_chat,
         "env": print_env,
-        "eval": run_eval,
-        "export": export_model,
-        "train": run_exp,
-        "webchat": run_web_demo,
-        "webui": run_web_ui,
+        "eval": _run_eval,
+        "export": _export_model,
+        "train": _run_exp,
+        "webchat": _run_web_demo,
+        "webui": _run_web_ui,
         "version": partial(print, WELCOME),
         "help": partial(print, USAGE),
     }