add docstring at cast_training_params

Author: mreraser

src/diffusers/training_utils.py

@@ -195,6 +195,13 @@ def unet_lora_state_dict(unet: UNet2DConditionModel) -> Dict[str, torch.Tensor]:
 
 
 def cast_training_params(model: Union[torch.nn.Module, List[torch.nn.Module]], dtype=torch.float32):
+    """
+    Casts the training parameters of the model to the specified data type.
+
+    Args:
+        model: The PyTorch model whose parameters will be cast.
+        dtype: The data type to which the model parameters will be cast.
+    """
     if not isinstance(model, list):
         model = [model]
     for m in model: