Issues encountered when using Efficient Teacher on personal datasets

您好，我在执行 `python val.py --config configs/sup/custom/yolov5s_custom.yaml --weights weights/efficient-yolov5s.pt` 此条命令时报错了，以下是我的 yaml 文件定义：

Dataset:
data_name: 'custom'
train: ['./images/train' ]
val: [ './images/valid' ]
test: [ './images/valid' ]
nc: 1 # number of classe
np: 0 #number of keypoints
names: [ 'apple' ]

---
我的数据集是 txt 格式，组织目录如下：
|-- dataset
| |-- images
| | |-- train
| | |-- valid
| |-- labels
| | |-- train
| | |-- valid

txt文件时标准的yolov5格式，如下所示：
`
0 0.927518 0.820644 0.123193 0.112306
0 0.525768 0.426199 0.050776 0.020583
`