您好，我在做 infer 的时候，一直报一下错误：
test_tipc/test_train_inference_python.sh: line 29: [: =: unary operator expected
python3.7: can't open file 'gpu': [Errno 2] No such file or directory
Run failed with command - python3.7 gpu|cpu --enable_mkldnn=False --cpu_threads=1 --batch_size=1 --image_dir=./test_tipc/output/norm_train_gpus_0_autocast_amp/fast_rcnn_r50_fpn_1x_coco --save_log_path=./test_tipc/demo/ > ./test_tipc/output/infer_cpu_usemkldnn_1_threads_1_batchsize_null.log 2>&1 !

test_train_inference_python.sh: line 29:
function func_set_params(){
key=$1
value=$2
if [ ${key} = "null" ];then
echo " "
elif ${value} = "null" || ${value} = " " || [ ${#value} -le 0 ];then
echo " "
else
echo "${key}=${value}"
fi
}

infer_model:model_final.pdparams
infer_model_dir:./test_tipc/weights
infer_quant:False
inference:deploy/python/infer.py
--device:gpu|cpu
--enable_mkldnn:False|True
--cpu_threads:1|4
--batch_size:1
--use_tensorrt:null
--run_mode:fluid|trt_fp32|trt_fp16|trt_int8
--model_dir:
--image_dir:./dataset/coco/val2017/
--save_log_path:null
--run_benchmark:True
null:null

但如果将 --device:gpu|cpu 删除就不会报错