[chore] Move guiders experimental warning (#12543)

* move guiders experimental warning to init.

* up

src/diffusers/guiders/__init__.py

@@ -17,12 +17,6 @@ from typing import Union
 from ..utils import is_torch_available, logging
 
 
-logger = logging.get_logger(__name__)
-logger.warning(
-    "Guiders are currently an experimental feature under active development. The API is subject to breaking changes in future releases."
-)
-
-
 if is_torch_available():
     from .adaptive_projected_guidance import AdaptiveProjectedGuidance
     from .adaptive_projected_guidance_mix import AdaptiveProjectedMixGuidance

src/diffusers/guiders/guider_utils.py

@@ -41,6 +41,10 @@ class BaseGuidance(ConfigMixin, PushToHubMixin):
     _identifier_key = "__guidance_identifier__"
 
     def __init__(self, start: float = 0.0, stop: float = 1.0, enabled: bool = True):
+        logger.warning(
+            "Guiders are currently an experimental feature under active development. The API is subject to breaking changes in future releases."
+        )
+
         self._start = start
         self._stop = stop
         self._step: int = None