No module named 'insightface.app' in insightface==0.7.3

I have installed the latest pip lib `insightface==0.7.3`, and I wanna simply replicate the example code in Pypi doc:

```
import cv2
import numpy as np
import insightface
from insightface.app import FaceAnalysis
from insightface.data import get_image as ins_get_image

model = FaceAnalysis(providers=['CUDAExecutionProvider', 'CPUExecutionProvider'])
model.prepare(ctx_id=0, det_size=(640, 640))
img = cv2.imread('avatars-test/aardsda01.jpg')
faces = model.get(img)
rimg = model.draw_on(img, faces)
cv2.imwrite("./t1_output.jpg", rimg)
```

But I got the error that:
```
ModuleNotFoundError: No module named 'insightface.app'; 'insightface' is not a package
```

Any idea to fix this? I appreciate any help