Add docstring for the AutoencoderKL's decode (#5242)

* Add docstring for the AutoencoderKL's decode

#5230

* Follow the style guidelines in AutoencoderKL's decode

#5230

---------

Co-authored-by: stano <>

src/diffusers/models/autoencoder_kl.py

@@ -281,6 +281,20 @@ class AutoencoderKL(ModelMixin, ConfigMixin, FromOriginalVAEMixin):
 
     @apply_forward_hook
     def decode(self, z: torch.FloatTensor, return_dict: bool = True) -> Union[DecoderOutput, torch.FloatTensor]:
+        """
+        Decode a batch of images.
+
+        Args:
+            z (`torch.FloatTensor`): Input batch of latent vectors.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether to return a [`~models.vae.DecoderOutput`] instead of a plain tuple.
+
+        Returns:
+            [`~models.vae.DecoderOutput`] or `tuple`:
+                If return_dict is True, a [`~models.vae.DecoderOutput`] is returned, otherwise a plain `tuple` is
+                returned.
+
+        """
         if self.use_slicing and z.shape[0] > 1:
             decoded_slices = [self._decode(z_slice).sample for z_slice in z.split(1)]
             decoded = torch.cat(decoded_slices)