python yolov8.py error

[lxy1015]

/home/cas/Desktop/rknn_model_zoo/py_utils/onnx_executor.py:12: FutureWarning: In the future np.bool will be defined as the corresponding NumPy scalar.
if getattr(np, 'bool', False):
Model-../model/yolov8n.onnx is onnx model, starting val
position.shape: (1, 84, 8400)
Traceback (most recent call last):
File "yolov8.py", line 265, in
boxes, classes, scores = post_process(outputs)
File "yolov8.py", line 124, in post_process
boxes.append(box_process(input_data[pair_per_branch*i]))
File "yolov8.py", line 104, in box_process
grid_h, grid_w = position.shape[2:4]
ValueError: not enough values to unpack (expected 2, got 1)

[zen-xingle]

Follow https://github.com/airockchip/rknn_model_zoo/blob/main/examples/yolov8/README.md to export/get the onnx model for the demo provided in this repo.

[lxy1015]

Follow https://github.com/airockchip/rknn_model_zoo/blob/main/examples/yolov8/README.md to export/get the onnx model for the demo provided in this repo.

I want to ask how to export the onnx format available for rknn from the pt/pth file?
Or can I only use the provided onnx model by official?