[v1] support switch v1 backend (#9226)

src/llamafactory/cli.py

@@ -36,52 +36,16 @@ 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():
-    raise NotImplementedError("Evaluation will be deprecated in the future.")
-
-
-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 .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
 
+    if is_env_enabled("USE_V1"):
+        from .v1 import launcher
+    else:
+        from . import launcher
+
     logger = logging.get_logger(__name__)
 
     WELCOME = (
@@ -97,14 +61,14 @@ def main():
     )
 
     COMMAND_MAP = {
-        "api": _run_api,
-        "chat": _run_chat,
+        "api": launcher.run_api,
+        "chat": launcher.run_chat,
         "env": print_env,
-        "eval": _run_eval,
-        "export": _export_model,
-        "train": _run_exp,
-        "webchat": _run_web_demo,
-        "webui": _run_web_ui,
+        "eval": launcher.run_eval,
+        "export": launcher.export_model,
+        "train": launcher.run_exp,
+        "webchat": launcher.run_web_demo,
+        "webui": launcher.run_web_ui,
         "version": partial(print, WELCOME),
         "help": partial(print, USAGE),
     }

src/llamafactory/launcher.py

@@ -13,11 +13,45 @@
 # limitations under the License.
 
 
-def launch():
-    from llamafactory.train.tuner import run_exp  # use absolute import
+def run_api():
+    from llamafactory.api.app import run_api as _run_api
 
-    run_exp()
+    _run_api()
+
+
+def run_chat():
+    from llamafactory.chat.chat_model import run_chat as _run_chat
+
+    return _run_chat()
+
+
+def run_eval():
+    raise NotImplementedError("Evaluation will be deprecated in the future.")
+
+
+def export_model():
+    from llamafactory.train.tuner import export_model as _export_model
+
+    return _export_model()
+
+
+def run_exp():
+    from llamafactory.train.tuner import run_exp as _run_exp
+
+    return _run_exp()  # use absolute import
+
+
+def run_web_demo():
+    from llamafactory.webui.interface import run_web_demo as _run_web_demo
+
+    return _run_web_demo()
+
+
+def run_web_ui():
+    from llamafactory.webui.interface import run_web_ui as _run_web_ui
+
+    return _run_web_ui()
 
 
 if __name__ == "__main__":
-    launch()
+    run_exp()

src/llamafactory/v1/launcher.py

@@ -0,0 +1,33 @@
+# Copyright 2025 the LlamaFactory team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+def run_train():
+    raise NotImplementedError("Please use `llamafactory-cli sft` or `llamafactory-cli rm`.")
+
+
+def run_chat():
+    from llamafactory.v1.core.chat_sampler import Sampler
+
+    Sampler().cli()
+
+
+def run_sft():
+    from llamafactory.v1.train.sft import SFTTrainer
+
+    SFTTrainer().run()
+
+
+if __name__ == "__main__":
+    run_train()