Cannot find the engine

[PredyDaddy]

I used this sample to infer an onnx from yolox,

import onnx
import onnx_tensorrt.backend as backend
import numpy as np

model = onnx.load("/path/to/model.onnx")
engine = backend.prepare(model, device='CUDA:1')
input_data = np.random.random(size=(1, 3, 640, 640)).astype(np.float32)
output_data = engine.run(input_data)[0]
print(output_data)
print(output_data.shape)

I can see the from command windows that tensorrt is generating the enigne, and later it shows the output shape is this same as my onnx, but I cannot find the engine where it generate, which means every time I run the code, I need generating the engine again.