torch.bmm()运行错误

WARNING: Token 'COMMENT' defined, but not used
WARNING: There is 1 unused token
E Catch exception when loading pytorch model: ./car_attributes_resnet18.pt!
E Traceback (most recent call last):
E   File "rknn/api/rknn_base.py", line 567, in rknn.api.rknn_base.RKNNBase.load_pytorch
E   File "rknn/base/RKNNlib/app/importer/import_pytorch.py", line 95, in rknn.base.RKNNlib.app.importer.import_pytorch.ImportPytorch.run
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 517, in rknn.base.RKNNlib.converter.convert_pytorch.convert_pytorch.__init__
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 601, in rknn.base.RKNNlib.converter.convert_pytorch.convert_pytorch.model_simplify
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 104, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.shape_pick
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 139, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.__ir_shape_inference
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 327, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.addmm_shape
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 104, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.shape_pick
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 139, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.__ir_shape_inference
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 211, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.elementwise_boardcast_shape
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 104, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.shape_pick
E   File "rknn/base/RKNNlib/converter/convert_pytorch.py", line 139, in rknn.base.RKNNlib.converter.convert_pytorch.torch_inference_engine.__ir_shape_inference
E KeyError: 'aten::sqrt'
Load pytorch model failed!

请问rknn运行torch.bmm有bug吗？