change generation engine

app.py

@@ -30,8 +30,9 @@ def infer(prompt):
     stability_api = client.StabilityInference(
         key=SD_KEY,  # AaPI Key reference.
         verbose=True,  # Print debug messages.
-        engine="stable-diffusion-v1",  # Set the engine to use for generation.
-        # Available engines: stable-diffusion-v1 stable-diffusion-v1-5 stable-diffusion-512-v2-0 stable-diffusion-768-v2-0 stable-inpainting-v1-0 stable-inpainting-512-v2-0
+        engine="stable-diffusion-xl-beta-v2-2-2",  # Set the engine to use for generation.
+        # Available engines: stable-diffusion-v1 stable-diffusion-v1-5 stable-diffusion-512-v2-0 stable-diffusion-768-v2-0
+        # stable-diffusion-512-v2-1 stable-diffusion-768-v2-1 stable-diffusion-xl-beta-v2-2-2 stable-inpainting-v1-0 stable-inpainting-512-v2-0
     )
     answers = stability_api.generate(
         prompt=prompt,