Fix tuned model selection for non-vulkan devices (huggingface#792)

Author: qedawkins

shark/examples/shark_inference/stable_diffusion/opt_params.py

@@ -33,7 +33,7 @@ def get_params(bucket_key, model_key, model, is_tuned, precision):
         ]
     except KeyError:
         raise Exception(
-            f"{bucket}/{model_key} is not present in the models database"
+            f"{bucket_key}/{model_key} is not present in the models database"
         )
 
     if (
@@ -62,7 +62,7 @@ def get_params(bucket_key, model_key, model, is_tuned, precision):
 def get_unet():
     # Tuned model is present only for `fp16` precision.
     is_tuned = "tuned" if args.use_tuned else "untuned"
-    if "vulkan" not in args.device and is_tuned:
+    if "vulkan" not in args.device and args.use_tuned:
         bucket_key = f"{args.variant}/{is_tuned}/{args.device}"
         model_key = f"{args.variant}/{args.version}/unet/{args.precision}/length_{args.max_length}/{is_tuned}/{args.device}"
     else: