update ESRGAN

Author: Artiprocher

diffsynth/extensions/ESRGAN/__init__.py

@@ -107,6 +107,12 @@ def decode_images(self, images):
 
     @torch.no_grad()
     def upscale(self, images, batch_size=4, progress_bar=lambda x:x):
+        if not isinstance(images, list):
+            images = [images]
+            is_single_image = True
+        else:
+            is_single_image = False
+
         # Preprocess
         input_tensor = self.process_images(images)
 
@@ -126,4 +132,6 @@ def upscale(self, images, batch_size=4, progress_bar=lambda x:x):
 
         # To images
         output_images = self.decode_images(output_tensor)
+        if is_single_image:
+            output_images = output_images[0]
         return output_images