BDD100K自动驾驶数据集格式转YOLO格式

为了用BDD100K数据集训练YOLOV5模型，首先需要将BDD100K数据集格式转成YOLOV5支持的输入格式。转换代码如下：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import re
import os
import json


def search_file(data_dir, pattern=r'.jpg$'):
    root_dir = os.path.abspath(data_dir)
    for root, dirs, files in os.walk(root_dir):
        for f in files:
            if re.search(pattern, f, re.I):
                abs_path = os.path.join(root, f)
                # print('new file %s' % absfn)
                yield abs_path


class Bdd2yolov5:
    def __init__(self):
        self.bdd100k_width = 1280
        self.bdd100k_height = 720
        # self.select_categorys = ["person", "car", "bus", "truck"]
        # self.cat2id = {
        #     "person": 0,
        #     "car": 1,
        #     "bus": 1,
        #     "tr