解决方案:
在torch.onnx.export钟添加do_constant_folding=False,如下
torch.onnx.export(model,(None, text),text_fp32_onnx_path,input_names=['text'],output_names=['unnorm_text_features'],export_params=True,opset_version=13,verbose=True,do_constant_folding=False )
https://github.com/UKPLab/sentence-transformers/issues/1296