Diffusers, txt2img and img2img, make sure guidance scale defaults to …

…0 when num steps <=4

Signed-off-by: Raphael Glon <[email protected]>

docker_images/diffusers/app/pipelines/image_to_image.py

@@ -233,6 +233,9 @@ def _process_req(self, image, prompt, **kwargs):
                 "negative_prompt": kwargs.get("negative_prompt", None),
                 "guidance_scale": kwargs.get("guidance_scale", 7),
             }
+            if int(kwargs["num_inference_steps"]) <= 4 and 'guidance_scale' not in kwargs.keys():
+                kwargs["guidance_scale"] = 0
+                prior_args["guidance_scale"] = 0
             image_emb, zero_image_emb = self.prior(prompt, **prior_args).to_tuple()
             images = self.ldm(
                 prompt,

docker_images/diffusers/app/pipelines/text_to_image.py

@@ -169,6 +169,9 @@ def _process_req(self, inputs, **kwargs):
                 kwargs["num_inference_steps"] = 20
             # Else, don't specify anything, leave the default behaviour
 
+        if int(kwargs.get("num_inference_steps", 20)) <= 4 and 'guidance_scale' not in kwargs.keys():
+            kwargs["guidance_scale"] = 0
+
         if "seed" in kwargs:
             seed = int(kwargs["seed"])
             generator = torch.Generator().manual_seed(seed)