[bug] inference(): return 422 jsonresponse in case of invalid input

lisa_on_cuda/utils/app_helpers.py

@@ -203,7 +203,7 @@ def get_inference_model_by_args(args_to_parse):
     logging.info(f"args_to_parse:{args_to_parse}, creating model...")
     model, clip_image_processor, tokenizer, transform = get_model(args_to_parse)
     logging.info("created model, preparing inference function")
-    no_seg_out, error_happened = placeholders["no_seg_out"], placeholders["error_happened"]
+    no_seg_out = placeholders["no_seg_out"]
 
     @session_logger.set_uuid_logging
     def inference(input_str: str, input_image: str | np.ndarray):
@@ -214,8 +214,16 @@ def get_inference_model_by_args(args_to_parse):
 
         ## input valid check
         if not re.match(r"^[A-Za-z ,.!?\'\"]+$", input_str) or len(input_str) < 1:
-            output_str = "[Error] Invalid input: ", input_str
-            return error_happened, output_str
+            output_str = f"[Error] Unprocessable Entity input: {input_str}."
+            logging.error(output_str)
+
+            from fastapi import status
+            from fastapi.responses import JSONResponse
+
+            return JSONResponse(
+                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                content={"msg": "Error - Unprocessable Entity"}
+            )
 
         # Model Inference
         conv = conversation_lib.conv_templates[args_to_parse.conv_type].copy()