CPU环境下导入报错

在CPU环境下导入，报以下错误：/home/anaconda3/envs/modelscope/lib/python3.7/site-packages/modelscope/models/nlp/gpt3/distributed_gpt3.py in 21 from megatron.model import (AttnMaskType, Float16Module, LayerNorm, 22 bias_gelu_impl) ---> 23 from megatron.model.fused_softmax import FusedScaleMaskSoftmax 24 from torch import nn 25 from torch.nn import functional as F 116 def _get_cuda_bare_metal_version(cuda_dir): --> 117 raw_output = subprocess.check_output([cuda_dir + '/bin/nvcc', '-V'], 118 universal_newlines=True) 119 output = raw_output.split() TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 请问要怎么处理