Fix GPU index parsing

backend/src/api.py

@@ -364,8 +364,10 @@ def get_bool(self, key: str, default: bool) -> bool:
             return value
         raise ValueError(f"Invalid bool value for {key}: {value}")
 
-    def get_int(self, key: str, default: int) -> int:
+    def get_int(self, key: str, default: int, parse_str: bool = False) -> int:
         value = self.__settings.get(key, default)
+        if parse_str and isinstance(value, str):
+            return int(value)
         if isinstance(value, int) and not isinstance(value, bool):
             return value
         raise ValueError(f"Invalid str value for {key}: {value}")

backend/src/packages/chaiNNer_ncnn/settings.py

@@ -42,5 +42,5 @@ def get_settings() -> NcnnSettings:
     settings = package.get_settings()
 
     return NcnnSettings(
-        gpu_index=settings.get_int("gpu_index", 0),
+        gpu_index=settings.get_int("gpu_index", 0, True),
     )

backend/src/packages/chaiNNer_onnx/settings.py

@@ -94,7 +94,7 @@ def get_settings() -> OnnxSettings:
         os.makedirs(tensorrt_cache_path)
 
     return OnnxSettings(
-        gpu_index=settings.get_int("gpu_index", 0),
+        gpu_index=settings.get_int("gpu_index", 0, True),
         execution_provider=settings.get_str("execution_provider", default_provider),
         tensorrt_cache_path=tensorrt_cache_path,
         tensorrt_fp16_mode=settings.get_bool("tensorrt_fp16_mode", False),

backend/src/packages/chaiNNer_pytorch/settings.py

@@ -78,5 +78,5 @@ def get_settings() -> PyTorchSettings:
     return PyTorchSettings(
         use_cpu=settings.get_bool("use_cpu", False),
         use_fp16=settings.get_bool("use_fp16", False),
-        gpu_index=settings.get_int("gpu_index", 0),
+        gpu_index=settings.get_int("gpu_index", 0, True),
     )