--> Building model
Traceback (most recent call last):
File "ssd.py", line 77, in <module>
rknn.build(do_quantization=False)
File "/home/vpi/.local/lib/python3.6/site-packages/rknn/api/rknn.py", line 163, in build
inputs = self.rknn_base.net.get_input_layers()
AttributeError: 'NoneType' object has no attribute 'get_input_layers'