Clean-up to fix rtd build

flash/core/finetuning.py

@@ -43,17 +43,16 @@ class FlashBaseFinetuning(BaseFinetuning):
 
     def __init__(
         self,
-        strategy_key: FinetuningStrategies,
+        strategy_key: Union[str, FinetuningStrategies],
         strategy_metadata: Optional[Union[int, Tuple[Tuple[int, int], int]]] = None,
         train_bn: bool = True,
     ):
         """
         Args:
             strategy_key: The finetuning strategy to be used. See :meth:`~flash.core.trainer.Trainer.finetune`
-                        for the available strategies.
+                for the available strategies.
             strategy_metadata: Data that accompanies certain finetuning strategies like epoch number or number of
-                        layers.
-            attr_names: Name(s) of the module attributes of the model to be frozen.
+                layers.
             train_bn: Whether to train Batch Norm layer
         """
         super().__init__()
@@ -62,11 +61,11 @@ def __init__(
         self.strategy_metadata: Optional[Union[int, Tuple[Tuple[int, int], int]]] = strategy_metadata
         self.train_bn: bool = train_bn
 
-        if self.strategy == "freeze_unfreeze" and not isinstance(self.strategy_metadata, int):
+        if self.strategy == FinetuningStrategies.FREEZE_UNFREEZE and not isinstance(self.strategy_metadata, int):
             raise MisconfigurationException(
                 "`freeze_unfreeze` stratgey only accepts one integer denoting the epoch number to switch."
             )
-        if self.strategy == "unfreeze_milestones" and not (
+        if self.strategy == FinetuningStrategies.UNFREEZE_MILESTONES and not (
             isinstance(self.strategy_metadata, Tuple)
             and isinstance(self.strategy_metadata[0], Tuple)
             and isinstance(self.strategy_metadata[1], int)
@@ -161,17 +160,17 @@ def finetune_function(
 
 # Used for properly verifying input and providing neat and helpful error messages for users.
 _DEFAULTS_FINETUNE_STRATEGIES = [
-    "no_freeze",
-    "freeze",
-    "freeze_unfreeze",
-    "unfreeze_milestones",
+    FinetuningStrategies.NO_FREEZE.value,
+    FinetuningStrategies.FREEZE.value,
+    FinetuningStrategies.FREEZE_UNFREEZE.value,
+    FinetuningStrategies.UNFREEZE_MILESTONES.value,
 ]
 
 _FINETUNING_STRATEGIES_REGISTRY = FlashRegistry("finetuning_strategies")
 
-for strategy in FinetuningStrategies:
+for strategy in _DEFAULTS_FINETUNE_STRATEGIES:
     _FINETUNING_STRATEGIES_REGISTRY(
-        name=strategy.value,
+        name=strategy,
         fn=partial(FlashBaseFinetuning, strategy_key=strategy),
     )