for i in range(0, len(all_char_imgs)): row_imgs = all_char_imgs[i] # 遍历块 for j in range(0, len(row_imgs)): block_imgs = row_imgs[j] block_imgs = np.array(block_imgs) # 图片识别 results = cnn.predict(model, block_imgs, class_name) print('recognize result:', results) # 计算结果 result = calculation(results) print('calculate result:', result) # 获取块的标注坐标 block_mark = all_mark_boxs[i][j] # 获取结果的坐标，写在块的最后一个字 answer_box = block_mark[-1] # 计算最后一个字的位置 x = answer_box[2] y = answer_box[3] iw = answer_box[2] - answer_box[0] ih = answer_box[3] - answer_box[1]详细解释每行代码

def main(path, save=False): # 获取切图标注，切图图片，原图图图片 all_mark_boxs, all_char_imgs, img_o = divImg(path, save) # 恢复模型，用于图片识别 model = cnn.create_model() model.load_weights('checkpoint/char_checkpoint') class_name = np.load('checkpoint/class_name.npy') # 遍历行 for i in range(0, len(all_char_imgs)): row_imgs = all_char_imgs[i] # 遍历块 for j in range(0, len(row_imgs)): block_imgs = row_imgs[j] block_imgs = np.array(block_imgs) # 图片识别 results = cnn.predict(model, block_imgs, class_name) print('recognize result:', results) # 计算结果 result = calculation(results) print('calculate result:', result) # 获取块的标注坐标 block_mark = all_mark_boxs[i][j] # 获取结果的坐标，写在块的最后一个字 answer_box = block_mark[-1] # 计算最后一个字的位置 x = answer_box[2] y = answer_box[3] iw = answer_box[2] - answer_box[0] ih = answer_box[3] - answer_box[1] # 计算字体大小 textSize = max(iw, ih) # 根据结果设置字体颜色 if str(result) == "√": color = (0, 255, 0) elif str(result) == "×": color = (255, 0, 0) else: color = (192, 192, 192) # 将结果写到原图上 img_o = cv2ImgAddText(img_o, str(result), answer_box[2], answer_box[1], color, textSize) # 将写满结果的原图保存 cv2.imwrite('imgs/question_result.png', img_o)详细解释每一行代码

for i in range(0, len(all_char_imgs)): row_imgs = all_char_imgs[i] for j in range(0, len(row_imgs)): block_imgs = row_imgs[j] block_imgs = np.array(block_imgs) results = cnn.predict(model, block_...

if name == "main": for filename in os.listdir(path): #img_names = [img_name for img_name in img_names if img_name.split(".")[-1] == "png"] img = cv2.imread( path + filename) imgarray,imgarray2 = findroi(img) if f%10==0: cv2.waitKey() cv2.destroyAllWindows() for i in imgarray: imgs_num+=1 print('检测出的红色标志数量为：'+str(imgs_num)) imgs_num=0 for i in imgarray2: imgs_num+=1

8. 将imgs_num重置为0。 9. 统计imgarray2中元素的数量，并将结果累加到imgs_num变量中。请注意，这段代码缺少部分变量的初始化和上下文信息，因此无法完整运行。另外，代码中注释掉的部分可能涉及到对文件...

解释一下 def getitem(self, index): current_index = np.random.choice(range(0, self.num_samples)) imgs_path = self.imgseqs[current_index].split() current_imgs = [] current_imgs_path = imgs_path[:len(imgs_path) - 1] current_label_path = imgs_path[len(imgs_path) - 1] current_label = self.loader(current_label_path)

在这个函数里，它随机选择一个索引，读取对应的图像序列路径（imgs_path），并把图像序列路径分成两个部分：当前图像的路径（current_imgs_path）和标签的路径（current_label_path）。然后，这个函数通过调用 self....

# 定义数据集读取器 def load_data(mode='train'): # 数据文件 datafile = './data/data116648/mnist.json.gz' print('loading mnist dataset from {} ......'.format(datafile)) data = json.load(gzip.open(datafile)) train_set, val_set, eval_set = data # 数据集相关参数，图片高度IMG_ROWS, 图片宽度IMG_COLS IMG_ROWS = 28 IMG_COLS = 28 if mode == 'train': imgs = train_set[0] labels = train_set[1] elif mode == 'valid': imgs = val_set[0] labels = val_set[1] elif mode == 'eval': imgs = eval_set[0] labels = eval_set[1] imgs_length = len(imgs) assert len(imgs) == len(labels), \ "length of train_imgs({}) should be the same as train_labels({})".format( len(imgs), len(labels)) index_list = list(range(imgs_length)) # 读入数据时用到的batchsize BATCHSIZE = 100 # 定义数据生成器 def data_generator(): if mode == 'train': random.shuffle(index_list) imgs_list = [] labels_list = [] for i in index_list: img = np.reshape(imgs[i], [1, IMG_ROWS, IMG_COLS]).astype('float32') img_trans=-img #转变颜色 label = np.reshape(labels[i], [1]).astype('int64') label_trans=label imgs_list.append(img) imgs_list.append(img_trans) labels_list.append(label) labels_list.append(label_trans) if len(imgs_list) == BATCHSIZE: yield np.array(imgs_list), np.array(labels_list) imgs_list = [] labels_list = [] # 如果剩余数据的数目小于BATCHSIZE， # 则剩余数据一起构成一个大小为len(imgs_list)的mini-batch if len(imgs_list) > 0: yield np.array(imgs_list), np.array(labels_list) return data_generator

这段代码定义了一个数据集读取器load_data，用于读取MNIST数据集。具体实现如下： - 首先从文件中加载MNIST数据集，数据集文件为'mnist.json.gz'，其中包含了训练集、验证集和测试集的图像和标签数据。...

代码改写# 获取新闻图片 imageList = list() bd_i_pics = bd_i_og.find_elements(by=By.CLASS_NAME, value='bd_i_pics') for bd_i_pic in bd_i_pics: imgs = bd_i_pic.find_elements(by=By.TAG_NAME, value='img') for img in imgs: imageUrl = img.get_attribute('src') imageList.append(imageUrl)

EC.presence_of_all_elements_located((By.CLASS_NAME, "news-content")) ) image_urls = [] for container in containers: images = container.find_elements(By.TAG_NAME, "img") for img in images: url...

解释 final_adv_imgs = final_adv_imgs[:, :, ::-1].transpose(1, 2, 0) # 将RGB通道顺序变为BGR通道顺序 ValueError: axes don't match array

具体来说，final_adv_imgs的维度应该是HWC（高度x宽度x通道数），但是传递给np.transpose函数的第二个参数却是（1, 2, 0），这个参数表示将final_adv_imgs的第二个维度放到转置后数组的第一个维度，将第三个维度放到...

class LoadStreams: # multiple IP or RTSP cameras def init(self, sources='streams.txt', img_size=416): self.mode = 'images' self.img_size = img_size if os.path.isfile(sources): with open(sources, 'r') as f: sources = [x.strip() for x in f.read().splitlines() if len(x.strip())] else: sources = [sources] n = len(sources) self.imgs = [None] * n self.sources = sources for i, s in enumerate(sources): # Start the thread to read frames from the video stream print('%g/%g: %s... ' % (i + 1, n, s), end='') cap = cv2.VideoCapture(0 if s == '0' else s) assert cap.isOpened(), 'Failed to open %s' % s w = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)) h = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)) fps = cap.get(cv2.CAP_PROP_FPS) % 100 _, self.imgs[i] = cap.read() # guarantee first frame thread = Thread(target=self.update, args=([i, cap]), daemon=True) print(' success (%gx%g at %.2f FPS).' % (w, h, fps)) thread.start() print('') # newline # check for common shapes s = np.stack([letterbox(x, new_shape=self.img_size)[0].shape for x in self.imgs], 0) # inference shapes self.rect = np.unique(s, axis=0).shape[0] == 1 # rect inference if all shapes equal if not self.rect: print('WARNING: Different stream shapes detected. For optimal performance supply similarly-shaped streams.') def update(self, index, cap): # Read next stream frame in a daemon thread n = 0 while cap.isOpened(): n += 1 # _, self.imgs[index] = cap.read() cap.grab() if n == 4: # read every 4th frame _, self.imgs[index] = cap.retrieve() n = 0 time.sleep(0.01) # wait time def iter(self): self.count = -1 return self def next(self): self.count += 1 img0 = self.imgs.copy() if cv2.waitKey(1) == ord('q'): # q to quit cv2.destroyAllWindows() raise StopIteration # Letterbox img = [letterbox(x, new_shape=self.img_size, auto=self.rect)[0] for x in img0] # Stack img = np.stack(img, 0) # Convert img = img[:, :, :, ::-1].transpose(0, 3, 1, 2) # BGR to RGB, to bsx3x416x416 img = np.ascontiguousarray(img) return self.sources, img, img0, None def len(self): return 0 # 1E12 frames = 32 streams at 30 FPS for 30 years 我想换摄像头设备，但在这个函数里出错了，ttributeError: 'NoneType' object has no attribute 'shape'

for attempt in range(max_attempts): success, self.imgs[i] = cap.read() if success: break else: print(f'摄像头 {s} 初始化尝试 {attempt+1}/{max_attempts}...') time.sleep(0.2) assert success, f'...

def _fetch_lfw_people(data_folder_path, slice_=None, color=False, resize=None, min_faces_per_person=0): """Perform the actual data loading for the lfw people dataset This operation is meant to be cached by a joblib wrapper. """ # scan the data folder content to retain people with more that # min_faces_per_person face pictures person_names, file_paths = [], [] for person_name in sorted(listdir(data_folder_path)): folder_path = join(data_folder_path, person_name) if not isdir(folder_path): continue paths = [join(folder_path, f) for f in sorted(listdir(folder_path))] n_pictures = len(paths) if n_pictures >= min_faces_per_person: person_name = person_name.replace('_', ' ') person_names.extend([person_name] * n_pictures) file_paths.extend(paths) n_faces = len(file_paths) if n_faces == 0: raise ValueError("min_faces_per_person=%d is too restrictive" % min_faces_per_person) target_names = np.unique(person_names) target = np.searchsorted(target_names, person_names) faces = _load_imgs(file_paths, slice_, color, resize) # shuffle the faces with a deterministic RNG scheme to avoid having # all faces of the same person in a row, as it would break some # cross validation and learning algorithms such as SGD and online # k-means that make an IID assumption indices = np.arange(n_faces) np.random.RandomState(42).shuffle(indices) faces, target = faces[indices], target[indices] return faces, target, target_names

列表中的文件路径将被传递给 _load_imgs() 函数，用于加载人脸照片。加载完所有人脸照片后，函数会对它们进行洗牌，以避免所有同一个人的照片出现在一起，从而保证数据集的随机性。最后，函数会返回所有人脸照片...

修改下面代码使其顺序选择索引，读取对应的图像序列路径（imgs_path），函数通过调用 self.loader() 函数来加载标签图像并一起返回 def getitem(self, index): current_index = np.random.choice(range(0, self.num_samples)) imgs_path = self.imgseqs[current_index].split() current_imgs = [] current_imgs_path = imgs_path[:len(imgs_path) - 1] current_label_path = imgs_path[len(imgs_path) - 1] current_label = self.loader(current_label_path)

current_imgs_path = imgs_path[:len(imgs_path) - 1] current_label_path = imgs_path[len(imgs_path) - 1] current_label = self.loader(current_label_path) return current_imgs, current_label, current_...

修改下面代码使其忽略标签并依次选择索引，读取对应的图像序列路径（imgs_path），函数通过调用 self.loader() 函数来加载图像并一起返回 def getitem(self, index): current_index = np.random.choice(range(0, self.num_samples)) imgs_path = self.imgseqs[current_index].split() current_imgs = [] current_imgs_path = imgs_path[:len(imgs_path) - 1] current_label_path = imgs_path[len(imgs_path) - 1] current_label = self.loader(current_label_path)

def getitem(self, index): ... current_label_path = [path for path in imgs_path if path.startswith(")][0][1:-1] current_label = self.loader(current_label_path) return current_imgs, current_label

修改下面代码使其去掉标签并顺序选择索引，读取对应的图像序列路径（imgs_path），函数通过调用 self.loader() 函数来加载标签图像并一起返回 def getitem(self, index): current_index = np.random.choice(range(0, self.num_samples)) imgs_path = self.imgseqs[current_index].split() current_imgs = [] current_imgs_path = imgs_path[:len(imgs_path) - 1] current_label_path = imgs_path[len(imgs_path) - 1] current_label = self.loader(current_label_path)

def getitem(self, index): current_imgs_path = self.imgseqs[index].split()[:-1] ... current_imgs = [self.loader(img_path) for img_path in current_imgs_path] return current_imgs, current_label

解释一下 img_predicted = imgs_masked.clone() img_predicted[:, :, x:x + h, y:y + w] = fake_imgs[:, :, x:x + h, y:y + w]

这段代码的作用是将混合了遮罩的图像（imgs_masked）中的部分像素替换为生成的假图像（fake_imgs）中对应位置的像素。具体来说，img_predicted的所有通道、所有行、所有列都与imgs_masked相同，但是在指定的区域内...

i_test = 0 print('-'30) print('Creating test images...') print('-'30) imgs_test = glob.glob(self.test_path+"/*."+"bmp") print(len(imgs_test)) imgdatas_test = np.ndarray((len(imgs_test),self.img_rows,self.img_cols,1), dtype=np.uint8) for imgname_test in imgs_test: midname_test = imgname_test[imgname_test.rindex("/")+1:] img_test = load_img(self.test_path + "/" + midname_test,grayscale = True) #img_test = scipy.io.loadmat(self.test_path + "/" + midname_test) #img_test = img_test['src'] #img_test=img_test.resize(hw) img_test = img_to_array(img_test) imgdatas_test[i_test] = img_test i_test += 1 print('loading test images done') imgs_test = imgdatas_test.astype('float32') imgs_test /= 255 return imgs_train, imgs_mask_train, imgs_test

这段代码是用于读取测试数据集中的图像数据，并将其转换为一个numpy数组。具体来说，它首先通过glob函数获取测试数据集中所有.bmp文件的路径，然后...函数返回imgs_train, imgs_mask_train, imgs_test三个numpy数组。

详细解释一下这段代码，每一句都要进行注解：def get_image_pairs_shortlist(fnames, sim_th = 0.6, # should be strict min_pairs = 20, exhaustive_if_less = 20, device=torch.device('cpu')): num_imgs = len(fnames) if num_imgs <= exhaustive_if_less: return get_img_pairs_exhaustive(fnames) model = timm.create_model('tf_efficientnet_b7', checkpoint_path='/kaggle/input/tf-efficientnet/pytorch/tf-efficientnet-b7/1/tf_efficientnet_b7_ra-6c08e654.pth') model.eval() descs = get_global_desc(fnames, model, device=device) #这段代码使用 PyTorch 中的 torch.cdist 函数计算两个矩阵之间的距离，其中参数 descs 是一个矩阵，表示一个数据集中的所有样本的特征向量。函数将计算两个矩阵的 p 范数距离，即对于矩阵 A 和 B，其 p 范数距离为： #dist_{i,j} = ||A_i - B_j||_p #其中 i 和 j 分别表示矩阵 A 和 B 中的第 i 和 j 行，||.||_p 表示 p 范数。函数的返回值是一个矩阵，表示所有样本之间的距离。 # detach() 和 cpu() 方法是为了将计算结果从 GPU 转移到 CPU 上，并将其转换为 NumPy 数组。最终的结果将会是一个 NumPy 数组。 dm = torch.cdist(descs, descs, p=2).detach().cpu().numpy() # removing half mask = dm <= sim_th total = 0 matching_list = [] ar = np.arange(num_imgs) already_there_set = [] for st_idx in range(num_imgs-1): mask_idx = mask[st_idx] to_match = ar[mask_idx] if len(to_match) < min_pairs: to_match = np.argsort(dm[st_idx])[:min_pairs] for idx in to_match: if st_idx == idx: continue if dm[st_idx, idx] < 1000: matching_list.append(tuple(sorted((st_idx, idx.item())))) total+=1 matching_list = sorted(list(set(matching_list))) return matching_list

使用 arange 函数生成一个包含 num_imgs 个元素的数组 ar。开始循环，对于每个图像，先获取其对应的掩码，得到所有与其距离小于等于 sim_th 的图像的索引 to_match。如果 to_match 数量小于 min_pairs，则选择与...

将下面代码简洁化：def split_dataset(img_path, target_folder_path, output_path): filename = [] total_imgs = os.listdir(img_path) #for root, dirs, files in os.walk(img_path): for img in total_imgs: filename.append(img) np.random.shuffle(filename) train = filename[:int(len(filename) * 0.9)] test = filename[int(len(filename) * 0.9):] out_images = os.path.join(output_path, 'imgs') if not os.path.exists(out_images): os.makedirs(out_images) out_images_train = os.path.join(out_images, 'training') if not os.path.exists(out_images_train): os.makedirs(out_images_train) out_images_test = os.path.join(out_images, 'test') if not os.path.exists(out_images_test): os.makedirs(out_images_test) out_annotations = os.path.join(output_path, 'annotations') if not os.path.exists(out_annotations): os.makedirs(out_annotations) out_annotations_train = os.path.join(out_annotations, 'training') if not os.path.exists(out_annotations_train): os.makedirs(out_annotations_train) out_annotations_test = os.path.join(out_annotations, 'test') if not os.path.exists(out_annotations_test): os.makedirs(out_annotations_test) for i in train: print(os.path.join(img_path, i)) print(os.path.join(out_images_train, i)) shutil.copyfile(os.path.join(img_path, i), os.path.join(out_images_train, i)) annotations_name = "gt_" + i[:-3] + 'txt' shutil.copyfile(os.path.join(target_folder_path, annotations_name), os.path.join(out_annotations_train, annotations_name)) for i in test: shutil.copyfile(os.path.join(img_path, i), os.path.join(out_images_test, i)) annotations_name = "gt_" + i[:-3] + 'txt' shutil.copyfile(os.path.join(target_folder_path, annotations_name), os.path.join(out_annotations_test, annotations_name))

for i in train: img_src = os.path.join(img_path, i) img_dst = os.path.join(out_images_train, i) shutil.copyfile(img_src, img_dst) annotations_name = "gt_" + i[:-3] + 'txt' annotations_src = os....

class ImbalancedDatasetSampler(data.sampler.Sampler): def init(self, dataset, indices: list = None, num_samples: int = None): self.indices = list(range(len(dataset))) if indices is None else indices self.num_samples = len(self.indices) if num_samples is None else num_samples df = pd.DataFrame() df["label"] = self._get_labels(dataset) df.index = self.indices df = df.sort_index() label_to_count = df["label"].value_counts() weights = 1.0 / label_to_count[df["label"]] self.weights = torch.DoubleTensor(weights.to_list()) def _get_labels(self, dataset): if isinstance(dataset, datasets.ImageFolder): return [x[1] for x in dataset.imgs] elif isinstance(dataset, torch.utils.data.Subset): return [dataset.dataset.imgs[i][1] for i in dataset.indices] else: raise NotImplementedError def iter(self): return (self.indices[i] for i in torch.multinomial(self.weights, self.num_samples, replacement=True)) def len(self): return self.num_samples 解释这段代码的作用

return [dataset.dataset.imgs[i][1] for i in dataset.indices] else: raise NotImplementedError #### 3. 采样迭代器 __iter__ python def __iter__(self): # 按权重进行多项式采样（带替换采样，...

import torch, os, cv2 from model.model import parsingNet from utils.common import merge_config from utils.dist_utils import dist_print import torch import scipy.special, tqdm import numpy as np import torchvision.transforms as transforms from data.dataset import LaneTestDataset from data.constant import culane_row_anchor, tusimple_row_anchor if name == "main": torch.backends.cudnn.benchmark = True args, cfg = merge_config() dist_print('start testing...') assert cfg.backbone in ['18','34','50','101','152','50next','101next','50wide','101wide'] if cfg.dataset == 'CULane': cls_num_per_lane = 18 elif cfg.dataset == 'Tusimple': cls_num_per_lane = 56 else: raise NotImplementedError net = parsingNet(pretrained = False, backbone=cfg.backbone,cls_dim = (cfg.griding_num+1,cls_num_per_lane,4), use_aux=False).cuda() # we dont need auxiliary segmentation in testing state_dict = torch.load(cfg.test_model, map_location='cpu')['model'] compatible_state_dict = {} for k, v in state_dict.items(): if 'module.' in k: compatible_state_dict[k[7:]] = v else: compatible_state_dict[k] = v net.load_state_dict(compatible_state_dict, strict=False) net.eval() img_transforms = transforms.Compose([ transforms.Resize((288, 800)), transforms.ToTensor(), transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225)), ]) if cfg.dataset == 'CULane': splits = ['test0_normal.txt', 'test1_crowd.txt', 'test2_hlight.txt', 'test3_shadow.txt', 'test4_noline.txt', 'test5_arrow.txt', 'test6_curve.txt', 'test7_cross.txt', 'test8_night.txt'] datasets = [LaneTestDataset(cfg.data_root,os.path.join(cfg.data_root, 'list/test_split/'+split),img_transform = img_transforms) for split in splits] img_w, img_h = 1640, 590 row_anchor = culane_row_anchor elif cfg.dataset == 'Tusimple': splits = ['test.txt'] datasets = [LaneTestDataset(cfg.data_root,os.path.join(cfg.data_root, split),img_transform = img_transforms) for split in splits] img_w, img_h = 1280, 720 row_anchor = tusimple_row_anchor else: raise NotImplementedError for split, dataset in zip(splits, datasets): loader = torch.utils.data.DataLoader(dataset, batch_size=1, shuffle = False, num_workers=1) fourcc = cv2.VideoWriter_fourcc('MJPG') print(split[:-3]+'avi') vout = cv2.VideoWriter(split[:-3]+'avi', fourcc , 30.0, (img_w, img_h)) for i, data in enumerate(tqdm.tqdm(loader)): imgs, names = data imgs = imgs.cuda() with torch.no_grad(): out = net(imgs) col_sample = np.linspace(0, 800 - 1, cfg.griding_num) col_sample_w = col_sample[1] - col_sample[0] out_j = out[0].data.cpu().numpy() out_j = out_j[:, ::-1, :] prob = scipy.special.softmax(out_j[:-1, :, :], axis=0) idx = np.arange(cfg.griding_num) + 1 idx = idx.reshape(-1, 1, 1) loc = np.sum(prob idx, axis=0) out_j = np.argmax(out_j, axis=0) loc[out_j == cfg.griding_num] = 0 out_j = loc # import pdb; pdb.set_trace() vis = cv2.imread(os.path.join(cfg.data_root,names[0])) for i in range(out_j.shape[1]): if np.sum(out_j[:, i] != 0) > 2: for k in range(out_j.shape[0]): if out_j[k, i] > 0: ppp = (int(out_j[k, i] * col_sample_w * img_w / 800) - 1, int(img_h * (row_anchor[cls_num_per_lane-1-k]/288)) - 1 ) cv2.circle(vis,ppp,5,(0,255,0),-1) vout.write(vis) vout.release()

代码还使用了LaneTestDataset数据集和culane_row_anchor、tusimple_row_anchor常量。在if __name__ == "__main__":中，代码设置了torch.backends.cudnn.benchmark为True，合并了配置信息args和cfg，并输出了“start ...

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