diff --git a/pyinfinitensor/src/pyinfinitensor/onnx.py b/pyinfinitensor/src/pyinfinitensor/onnx.py
index ffb61529..1f6afe19 100644
--- a/pyinfinitensor/src/pyinfinitensor/onnx.py
+++ b/pyinfinitensor/src/pyinfinitensor/onnx.py
@@ -572,6 +572,24 @@ class OnnxStub:
 
         return ctx.build(name)
 
+    def init(self) -> None:
+        self.handler.data_malloc()
+
+    def run(self) -> None:
+        self.handler.run()
+
+    def put_int32(self, name: str) -> None:
+        self.handler.copy_int32(self.inputs[name])
+
+    def put_int64(self, name: str) -> None:
+        self.handler.copy_int64(self.inputs[name])
+
+    def put_float(self, name: str) -> None:
+        self.handler.copy_float(self.inputs[name])
+
+    def take_float(self) -> List[float]:
+        return next(self.handler.outputs.values()).copyFloats()
+
 
 def from_onnx(model: ModelProto, runtime):
     stub = OnnxStub(model, runtime)