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  • Fast RCNN 训练自己数据集 (2修改数据读取接口)

    Fast RCNN训练自己的数据集 (2修改读写接口)

    转载请注明出处,楼燚(yì)航的blog,http://www.cnblogs.com/louyihang-loves-baiyan/

    https://github.com/YihangLou/fast-rcnn-train-another-dataset 这是我在github上修改的几个文件的链接,求星星啊,求星星啊(原谅我那么不要脸~~)

    这里楼主讲解了如何修改Fast RCNN训练自己的数据集,首先请确保你已经安装好了Fast RCNN的环境,具体的编配编制操作请参考我的上一篇文章。首先可以看到fast rcnn的工程目录下有个Lib目录
    这里下面存在3个目录分别是:

    • datasets
    • fast_rcnn
    • roi_data_layer
    • utils

    在这里修改读写数据的接口主要是datasets目录下,fast_rcnn下面主要存放的是python的训练和测试脚本,以及训练的配置文件,roi_data_layer下面存放的主要是一些ROI处理操作,utils下面存放的是一些通用操作比如非极大值nms,以及计算bounding box的重叠率等常用功能

    1.构建自己的IMDB子类

    1.1文件概述

    可有看到datasets目录下主要有三个文件,分别是

    • factory.py
    • imdb.py
    • pascal_voc.py

    factory.py 学过设计模式的应该知道这是个工厂类,用类生成imdb类并且返回数据库共网络训练和测试使用
    imdb.py 这里是数据库读写类的基类,分装了许多db的操作,但是具体的一些文件读写需要继承继续读写
    pascal_voc.py Ross在这里用pascal_voc.py这个类来操作

    1.2 读取文件函数分析

    接下来我来介绍一下pasca_voc.py这个文件,我们主要是基于这个文件进行修改,里面有几个重要的函数需要修改

    • def init(self, image_set, year, devkit_path=None)
      这个是初始化函数,它对应着的是pascal_voc的数据集访问格式,其实我们将其接口修改的更简单一点
    • def image_path_at(self, i)
      根据第i个图像样本返回其对应的path,其调用了image_path_from_index(self, index)作为其具体实现
    • def image_path_from_index(self, index)
      实现了 image_path的具体功能
    • def _load_image_set_index(self)
      加载了样本的list文件
    • def _get_default_path(self)
      获得数据集地址
    • def gt_roidb(self)
      读取并返回ground_truth的db
    • def selective_search_roidb
      读取并返回ROI的db
    • def _load_selective_search_roidb(self, gt_roidb)
      加载预选框的文件
    • def selective_search_IJCV_roidb(self)
      在这里调用读取Ground_truth和ROI db并将db合并
    • def _load_selective_search_IJCV_roidb(self, gt_roidb)
      这里是专门读取作者在IJCV上用的dataset
    • def _load_pascal_annotation(self, index)
      这个函数是读取gt的具体实现
    • def _write_voc_results_file(self, all_boxes)
      voc的检测结果写入到文件
    • def _do_matlab_eval(self, comp_id, output_dir='output')
      根据matlab的evluation接口来做结果的分析
    • def evaluate_detections
      其调用了_do_matlab_eval
    • def competition_mode
      设置competitoin_mode,加了一些噪点

    1.3训练数据集格式

    在我的检测任务里,我主要是从道路卡口数据中检测车,因此我这里只有background 和car两类物体,为了操作方便,我不像pascal_voc数据集里面一样每个图像用一个xml来标注多类,先说一下我的数据格式

    这里是所有样本的图像列表

    我的GroundTruth数据的格式,第一个为图像路径,之后1代表目标物的个数, 后面的坐标代表左上右下的坐标,坐标的位置从1开始

    这里我要特别提醒一下大家,一定要注意坐标格式,一定要注意坐标格式,一定要注意坐标格式,重要的事情说三遍!!!,要不然你会范很多错误都会是因为坐标不一致引起的报错

    1.4修改读取接口

    这里是原始的pascal_voc的init函数,在这里,由于我们自己的数据集往往比voc的数据集要更简单的一些,在作者额代码里面用了很多的路径拼接,我们不用去迎合他的格式,将这些操作简单化即可,在这里我会一一列举每个我修改过的函数。这里按照文件中的顺序排列。
    原始初始化函数:

    def __init__(self, image_set, year, devkit_path=None):
    	datasets.imdb.__init__(self, 'voc_' + year + '_' + image_set)
        self._year = year
        self._image_set = image_set
        self._devkit_path = self._get_default_path() if devkit_path is None 
                            else devkit_path
        self._data_path = os.path.join(self._devkit_path, 'VOC' + self._year)
        self._classes = ('__background__', # always index 0
                         'aeroplane', 'bicycle', 'bird', 'boat',
                         'bottle', 'bus', 'car', 'cat', 'chair',
                         'cow', 'diningtable', 'dog', 'horse',
                         'motorbike', 'person', 'pottedplant',
                         'sheep', 'sofa', 'train', 'tvmonitor')
        self._class_to_ind = dict(zip(self.classes, xrange(self.num_classes)))
        self._image_ext = '.jpg'
        self._image_index = self._load_image_set_index()
        # Default to roidb handler
        self._roidb_handler = self.selective_search_roidb
    
        # PASCAL specific config options
        self.config = {'cleanup'  : True,
                       'use_salt' : True,
                       'top_k'    : 2000}
    
        assert os.path.exists(self._devkit_path), 
                'VOCdevkit path does not exist: {}'.format(self._devkit_path)
        assert os.path.exists(self._data_path), 
                'Path does not exist: {}'.format(self._data_path)
    

    修改后的初始化函数:

     def __init__(self, image_set, devkit_path=None):
        datasets.imdb.__init__(self, image_set)#imageset 为train  test
        self._image_set = image_set
        self._devkit_path = devkit_path
        self._data_path = os.path.join(self._devkit_path)
        self._classes = ('__background__','car')#包含的类
        self._class_to_ind = dict(zip(self.classes, xrange(self.num_classes)))#构成字典{'__background__':'0','car':'1'}
        self._image_index = self._load_image_set_index('ImageList_Version_S_AddData.txt')#添加文件列表
        # Default to roidb handler
        self._roidb_handler = self.selective_search_roidb
        # PASCAL specific config options
        self.config = {'cleanup'  : True,
                       'use_salt' : True,
                       'top_k'    : 2000}
        assert os.path.exists(self._devkit_path), 
                'VOCdevkit path does not exist: {}'.format(self._devkit_path)
        assert os.path.exists(self._data_path), 
                'Path does not exist: {}'.format(self._data_path)
    

    原始的image_path_from_index:

    def image_path_from_index(self, index):
        """
        Construct an image path from the image's "index" identifier.
        """
        image_path = os.path.join(self._data_path, 'JPEGImages',
                                  index + self._image_ext)
        assert os.path.exists(image_path), 
                'Path does not exist: {}'.format(image_path)
        return image_path
    

    修改后的image_path_from_index:

     def image_path_from_index(self, index):#根据_image_index获取图像路径
        """
        Construct an image path from the image's "index" identifier.
        """
        image_path = os.path.join(self._data_path, index)
        assert os.path.exists(image_path), 
                'Path does not exist: {}'.format(image_path)
        return image_path
    

    原始的 _load_image_set_index:

     def _load_image_set_index(self):
        """
        Load the indexes listed in this dataset's image set file.
        """
        # Example path to image set file:
        # self._devkit_path + /VOCdevkit2007/VOC2007/ImageSets/Main/val.txt
        image_set_file = os.path.join(self._data_path, 'ImageSets', 'Main',
                                      self._image_set + '.txt')
        assert os.path.exists(image_set_file), 
                'Path does not exist: {}'.format(image_set_file)
        with open(image_set_file) as f:
            image_index = [x.strip() for x in f.readlines()]
        return image_index
    

    修改后的 _load_image_set_index:

    def _load_image_set_index(self, imagelist):#已经修改
        """
        Load the indexes listed in this dataset's image set file.
        """
        # Example path to image set file:
        # self._devkit_path + /VOCdevkit2007/VOC2007/ImageSets/Main/val.txt
        #/home/chenjie/KakouTrainForFRCNN_1/DataSet/KakouTrainFRCNN_ImageList.txt
        image_set_file = os.path.join(self._data_path, imagelist)# load ImageList that only contain ImageFileName
        assert os.path.exists(image_set_file), 
                'Path does not exist: {}'.format(image_set_file)
        with open(image_set_file) as f:
            image_index = [x.strip() for x in f.readlines()]
        return image_index
    

    函数 _get_default_path,我直接删除了

    原始的gt_roidb:

    def gt_roidb(self):
        """
        Return the database of ground-truth regions of interest.
    
        This function loads/saves from/to a cache file to speed up future calls.
        """
        cache_file = os.path.join(self.cache_path, self.name + '_gt_roidb.pkl')
        if os.path.exists(cache_file):
            with open(cache_file, 'rb') as fid:
                roidb = cPickle.load(fid)
            print '{} gt roidb loaded from {}'.format(self.name, cache_file)
            return roidb
    
        gt_roidb = [self._load_pascal_annotation(index)
                    for index in self.image_index]
        with open(cache_file, 'wb') as fid:
            cPickle.dump(gt_roidb, fid, cPickle.HIGHEST_PROTOCOL)
        print 'wrote gt roidb to {}'.format(cache_file)
    
        return gt_roidb
    

    修改后的gt_roidb:

    def gt_roidb(self):
        """
        Return the database of ground-truth regions of interest.
    
        This function loads/saves from/to a cache file to speed up future calls.
        """
        cache_file = os.path.join(self.cache_path, self.name + '_gt_roidb.pkl')
        if os.path.exists(cache_file):#若存在cache file则直接从cache file中读取
            with open(cache_file, 'rb') as fid:
                roidb = cPickle.load(fid)
            print '{} gt roidb loaded from {}'.format(self.name, cache_file)
            return roidb
    
        gt_roidb = self._load_annotation()  #已经修改,直接读入整个GT文件
        with open(cache_file, 'wb') as fid:
            cPickle.dump(gt_roidb, fid, cPickle.HIGHEST_PROTOCOL)
        print 'wrote gt roidb to {}'.format(cache_file)
    
        return gt_roidb
    

    原始的selective_search_roidb(self):

    def selective_search_roidb(self):
        """
        Return the database of selective search regions of interest.
        Ground-truth ROIs are also included.
    
        This function loads/saves from/to a cache file to speed up future calls.
        """
        cache_file = os.path.join(self.cache_path,
                                  self.name + '_selective_search_roidb.pkl')
    
        if os.path.exists(cache_file):
            with open(cache_file, 'rb') as fid:
                roidb = cPickle.load(fid)
            print '{} ss roidb loaded from {}'.format(self.name, cache_file)
            return roidb
    
        if int(self._year) == 2007 or self._image_set != 'test':
            gt_roidb = self.gt_roidb()
            ss_roidb = self._load_selective_search_roidb(gt_roidb)
            roidb = datasets.imdb.merge_roidbs(gt_roidb, ss_roidb)
        else:
            roidb = self._load_selective_search_roidb(None)
        with open(cache_file, 'wb') as fid:
            cPickle.dump(roidb, fid, cPickle.HIGHEST_PROTOCOL)
        print 'wrote ss roidb to {}'.format(cache_file)
    
        return roidb
    

    修改后的selective_search_roidb(self):
    这里有个pkl文件我需要特别说明一下,如果你再次训练的时候修改了数据库,比如添加或者删除了一些样本,但是你的数据库名字函数原来那个,比如我这里训练的数据库叫KakouTrain,必须要在data/cache/目录下把数据库的缓存文件.pkl给删除掉,否则其不会重新读取相应的数据库,而是直接从之前读入然后缓存的pkl文件中读取进来,这样修改的数据库并没有进入网络,而是加载了老版本的数据。

    def selective_search_roidb(self):#已经修改
        """
        Return the database of selective search regions of interest.
        Ground-truth ROIs are also included.
    
        This function loads/saves from/to a cache file to speed up future calls.
        """
        cache_file = os.path.join(self.cache_path,self.name + '_selective_search_roidb.pkl')
    
        if os.path.exists(cache_file): #若存在cache_file则读取相对应的.pkl文件
            with open(cache_file, 'rb') as fid:
                roidb = cPickle.load(fid)
            print '{} ss roidb loaded from {}'.format(self.name, cache_file)
            return roidb
        if self._image_set !='KakouTest':
            gt_roidb = self.gt_roidb()
            ss_roidb = self._load_selective_search_roidb(gt_roidb)
            roidb = datasets.imdb.merge_roidbs(gt_roidb, ss_roidb)
        else:
            roidb = self._load_selective_search_roidb(None)
        with open(cache_file, 'wb') as fid:
            cPickle.dump(roidb, fid, cPickle.HIGHEST_PROTOCOL)
        print 'wrote ss roidb to {}'.format(cache_file)
    
        return roidb
    

    原始的_load_selective_search_roidb(self, gt_roidb):

     def _load_selective_search_roidb(self, gt_roidb):
        filename = os.path.abspath(os.path.join(self.cache_path, '..',
                                                'selective_search_data',
                                                self.name + '.mat'))
        assert os.path.exists(filename), 
               'Selective search data not found at: {}'.format(filename)
        raw_data = sio.loadmat(filename)['boxes'].ravel()
    
        box_list = []
        for i in xrange(raw_data.shape[0]):
            box_list.append(raw_data[i][:, (1, 0, 3, 2)] - 1)
    
        return self.create_roidb_from_box_list(box_list, gt_roidb)
    

    修改后的_load_selective_search_roidb(self, gt_roidb):
    这里原作者用的是Selective_search,但是我用的是EdgeBox的方法来提取Mat,我没有修改函数名,只是把输入的Mat文件给替换了,Edgebox实际的效果比selective_search要好,速度也要更快,具体的EdgeBox代码大家可以在Ross的tutorial中看到地址。
    注意,这里非常关键!!!!!,由于Selective_Search中的OP返回的坐标顺序需要调整,并不是左上右下的顺序,可以看到在下面box_list.append()中有一个(1,0,3,2)的操作,不管你用哪种OP方法,输入的坐标都应该是x1 y1 x2 y2,不要弄成w h 那种格式,也不要调换顺序。坐标-1,默认坐标从0开始,楼主提醒各位,一定要非常注意坐标顺序,大小,边界,格式问题,否则你会被错误折腾死的!!!

    def _load_selective_search_roidb(self, gt_roidb):#已经修改
        #filename = os.path.abspath(os.path.join(self.cache_path, '..','selective_search_data',self.name + '.mat'))
        filename = os.path.join(self._data_path, 'EdgeBox_Version_S_AddData.mat')#这里输入相对应的预选框文件路径
        assert os.path.exists(filename), 
               'Selective search data not found at: {}'.format(filename)
        raw_data = sio.loadmat(filename)['boxes'].ravel()
    
        box_list = []
        for i in xrange(raw_data.shape[0]):
            #box_list.append(raw_data[i][:,(1, 0, 3, 2)] - 1)#原来的Psacalvoc调换了列,我这里box的顺序是x1 ,y1,x2,y2 由EdgeBox格式为x1,y1,w,h经过修改
        	box_list.append(raw_data[i][:,:] -1)
    
        return self.create_roidb_from_box_list(box_list, gt_roidb)
    

    原始的_load_selective_search_IJCV_roidb,我没用这个数据集,因此不修改这个函数

    原始的_load_pascal_annotation(self, index):

    def _load_pascal_annotation(self, index):
        """
        Load image and bounding boxes info from XML file in the PASCAL VOC
        format.
        """
        filename = os.path.join(self._data_path, 'Annotations', index + '.xml')
        # print 'Loading: {}'.format(filename)
        def get_data_from_tag(node, tag):
            return node.getElementsByTagName(tag)[0].childNodes[0].data
    
        with open(filename) as f:
            data = minidom.parseString(f.read())
    
        objs = data.getElementsByTagName('object')
        num_objs = len(objs)
    
        boxes = np.zeros((num_objs, 4), dtype=np.uint16)
        gt_classes = np.zeros((num_objs), dtype=np.int32)
        overlaps = np.zeros((num_objs, self.num_classes), dtype=np.float32)
    
        # Load object bounding boxes into a data frame.
        for ix, obj in enumerate(objs):
            # Make pixel indexes 0-based
            x1 = float(get_data_from_tag(obj, 'xmin')) - 1
            y1 = float(get_data_from_tag(obj, 'ymin')) - 1
            x2 = float(get_data_from_tag(obj, 'xmax')) - 1
            y2 = float(get_data_from_tag(obj, 'ymax')) - 1
            cls = self._class_to_ind[
                    str(get_data_from_tag(obj, "name")).lower().strip()]
            boxes[ix, :] = [x1, y1, x2, y2]
            gt_classes[ix] = cls
            overlaps[ix, cls] = 1.0
    
        overlaps = scipy.sparse.csr_matrix(overlaps)
    
        return {'boxes' : boxes,
                'gt_classes': gt_classes,
                'gt_overlaps' : overlaps,
                'flipped' : False}
    
    

    修改后的_load_pascal_annotation(self, index):

    def _load_annotation(self):
        """
        Load image and bounding boxes info from annotation
        format.
        """
        #,此函数作用读入GT文件,我的文件的格式 CarTrainingDataForFRCNN_1Images2015011100035366101A000131.jpg 1 147 65 443 361 
        gt_roidb = []
        annotationfile = os.path.join(self._data_path, 'ImageList_Version_S_GT_AddData.txt')
        f = open(annotationfile)
        split_line = f.readline().strip().split()
    	num = 1
        while(split_line):
            num_objs = int(split_line[1])
            boxes = np.zeros((num_objs, 4), dtype=np.uint16)
            gt_classes = np.zeros((num_objs), dtype=np.int32)
            overlaps = np.zeros((num_objs, self.num_classes), dtype=np.float32)
            for i in range(num_objs):
                x1 = float( split_line[2 + i * 4])
                y1 = float (split_line[3 + i * 4])
                x2 = float (split_line[4 + i * 4])
                y2 = float (split_line[5 + i * 4])
                cls = self._class_to_ind['car']
                boxes[i,:] = [x1, y1, x2, y2]
                gt_classes[i] = cls
                overlaps[i,cls] = 1.0
    
            overlaps = scipy.sparse.csr_matrix(overlaps)
            gt_roidb.append({'boxes' : boxes, 'gt_classes': gt_classes, 'gt_overlaps' : overlaps, 'flipped' : False})
            split_line = f.readline().strip().split()
    
        f.close()
        return gt_roidb
    

    之后的这几个函数我都没有修改,检测结果,我是修改了demo.py这个文件,直接生成txt文件,然后用python opencv直接可视化,没有用着里面的接口,感觉太麻烦了,先怎么方便怎么来

    • _write_voc_results_file(self, all_boxes)
    • _do_matlab_eval(self, comp_id, output_dir='output')
    • evaluate_detections(self, all_boxes, output_dir)
    • competition_mode(self, on)

    记得在最后的__main__下面也修改相应的路径
    d = datasets.pascal_voc('trainval', '2007')
    改成
    d = datasets.kakou('KakouTrain', '/home/chenjie/KakouTrainForFRCNN_1')

    并且同时在文件的开头import 里面也做修改
    import datasets.pascal_voc
    改成
    import datasets.kakou

    OK,在这里我们已经完成了整个的读取接口的改写,主要是将GT和预选框Mat文件读取并返回

    2.修改factory.py

    当网络训练时会调用factory里面的get方法获得相应的imdb,
    首先在文件头import 把pascal_voc改成kakou
    在这个文件作者生成了多个数据库的路径,我们自己数据库只要给定根路径即可,修改主要有以下4个

    • 因此将里面的def _selective_search_IJCV_top_k函数整个注释掉
    • 函数之后有两个多级的for循环,也将其注释
    • 直接定义imageset和devkit
    • 修改get_imdb函数

    原始的factory.py:

    __sets = {}
    
    import datasets.pascal_voc
    import numpy as np
    
    def _selective_search_IJCV_top_k(split, year, top_k):
        """Return an imdb that uses the top k proposals from the selective search
        IJCV code.
        """
        imdb = datasets.pascal_voc(split, year)
        imdb.roidb_handler = imdb.selective_search_IJCV_roidb
        imdb.config['top_k'] = top_k
        return imdb
    
    # Set up voc_<year>_<split> using selective search "fast" mode
    for year in ['2007', '2012']:
        for split in ['train', 'val', 'trainval', 'test']:
            name = 'voc_{}_{}'.format(year, split)
            __sets[name] = (lambda split=split, year=year:
                    datasets.pascal_voc(split, year))
    
    # Set up voc_<year>_<split>_top_<k> using selective search "quality" mode
    # but only returning the first k boxes
    for top_k in np.arange(1000, 11000, 1000):
        for year in ['2007', '2012']:
            for split in ['train', 'val', 'trainval', 'test']:
                name = 'voc_{}_{}_top_{:d}'.format(year, split, top_k)
                __sets[name] = (lambda split=split, year=year, top_k=top_k:
                        _selective_search_IJCV_top_k(split, year, top_k))
    
    def get_imdb(name):
        """Get an imdb (image database) by name."""
        if not __sets.has_key(name):
            raise KeyError('Unknown dataset: {}'.format(name))
        return __sets[name]()
    
    def list_imdbs():
        """List all registered imdbs."""
        return __sets.keys()
    
    

    修改后的factory.py

    #import datasets.pascal_voc
    import datasets.kakou
    import numpy as np
    
    __sets = {}
    imageset = 'KakouTrain'
    devkit = '/home/chenjie/DataSet/CarTrainingDataForFRCNN_1/Images_Version_S_AddData'
    #def _selective_search_IJCV_top_k(split, year, top_k):
    #    """Return an imdb that uses the top k proposals from the selective search
    #    IJCV code.
    #    """
    #    imdb = datasets.pascal_voc(split, year)
    #    imdb.roidb_handler = imdb.selective_search_IJCV_roidb
    #    imdb.config['top_k'] = top_k
    #    return imdb
    
    ### Set up voc_<year>_<split> using selective search "fast" mode
    ##for year in ['2007', '2012']:
    ##    for split in ['train', 'val', 'trainval', 'test']:
    ##        name = 'voc_{}_{}'.format(year, split)
    ##        __sets[name] = (lambda split=split, year=year:
    ##                datasets.pascal_voc(split, year))
    
    # Set up voc_<year>_<split>_top_<k> using selective search "quality" mode
    # but only returning the first k boxes
    ##for top_k in np.arange(1000, 11000, 1000):
    ##    for year in ['2007', '2012']:
    ##        for split in ['train', 'val', 'trainval', 'test']:
    ##            name = 'voc_{}_{}_top_{:d}'.format(year, split, top_k)
    ##            __sets[name] = (lambda split=split, year=year, top_k=top_k:
    ##                    _selective_search_IJCV_top_k(split, year, top_k))
    
    
    def get_imdb(name):
        """Get an imdb (image database) by name."""
        __sets['KakouTrain'] = (lambda imageset = imageset, devkit = devkit: datasets.kakou(imageset,devkit))
        if not __sets.has_key(name):
            raise KeyError('Unknown dataset: {}'.format(name))
        return __sets[name]()
    
    def list_imdbs():
        """List all registered imdbs."""
        return __sets.keys()
    

    3.修改 __init__.py

    在行首添加上 from .kakou import kakou

    总结

    在这里终于改完了读取接口的所有内容,主要步骤是

    1. 复制pascal_voc,改名字,修改GroundTruth和OP预选框的读取方式
    2. 修改factory.py,修改数据库路径和获得方式
    3. __init__.py添加上改完的py文件

    下面列出一些需要注意的地方

    1. 读取方式怎么方便怎么来,并不一定要按照里面xml的格式,因为大家自己应用到工程中去往往不会是非常多的类别,单个对象的直接用txt就可以
    2. 坐标的顺序我再说一次,要左上右下,并且x1必须要小于x2,这个是基本,反了会在坐标水平变换的时候会出错,坐标从0开始,如果已经是0,则不需要再-1
    3. GT的路径最好用相对,别用绝对,然后路径拼接的时候要注意,然后如果是txt是windows下生成的,注意斜杠的方向和编码的格式,中文路径编码必须用UTF-8无BOM格式,不能用windows自带的记事本直接换一种编码存储,相关数据集的编码问题参见我的另一篇文章,linux传输乱码
    4. 关于Mat文件,在训练时是将所有图像的OP都合在了一起,是一个很大的Mat文件,注意其中图像list的顺序千万不能错,并且坐标格式要修改为x1 y1 x2 y2,每种OP生成的坐标顺序要小心,从0开始还是从1开始也要小心
    5. 训练图像的大小不要太大,否则生成的OP也会太多,速度太慢,图像样本大小最好调整到500,600左右,然后再提取OP
    6. 如果读取并生成pkl文件之后,实际数据内容或者顺序还有问题,记得要把data/cache/下面的pkl文件给删掉

    关于下部训练和检测网络,我将在下一篇文章中说明

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  • 原文地址:https://www.cnblogs.com/louyihang-loves-baiyan/p/4903231.html
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