features_original = normalize(Dist_Mat) features_true = normalize(Dist)

这段代码看起来像是对距离矩阵进行了归一化处理，其中 Dist_Mat 和 Dist 可能是两个距离矩阵，normalize() 函数则是对它们进行了归一化操作。具体的归一化方法需要看一下 normalize() 函数的实现，可能是将数据缩放到 [0,1] 或者 [-1,1] 的范围内，也可能是使用其他的归一化方法。归一化可以使得不同的数据具有可比性，并且能够避免某些数据对模型训练的影响过大。

相关问题

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()

这段代码使用了PyTorch、OpenCV等库，从模型模块中导入了parsingNet模型，从常用工具模块中导入了merge_config和dist_print等函数。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 testing...”信息。然后根据配置信息中的backbone选择了不同的通道数，并初始化了一个parsingNet模型。

class MLP(nn.Module): def __init__( self, input_size: int, output_size: int, n_hidden: int, classes: int, dropout: float, normalize_before: bool = True ): super(MLP, self).__init__() self.input_size = input_size self.dropout = dropout self.n_hidden = n_hidden self.classes = classes self.output_size = output_size self.normalize_before = normalize_before self.model = nn.Sequential( nn.Linear(self.input_size, n_hidden), nn.Dropout(self.dropout), nn.ReLU(), nn.Linear(n_hidden, self.output_size), nn.Dropout(self.dropout), nn.ReLU(), ) self.after_norm = torch.nn.LayerNorm(self.input_size, eps=1e-5) self.fc = nn.Sequential( nn.Dropout(self.dropout), nn.Linear(self.input_size, self.classes) ) self.output_layer = nn.Linear(self.output_size, self.classes) def forward(self, x): self.device = torch.device('cuda') # x = self.model(x) if self.normalize_before: x = self.after_norm(x) batch_size, length, dimensions = x.size(0), x.size(1), x.size(2) output = self.model(x) return output.mean(dim=1) class LabelSmoothingLoss(nn.Module): def __init__(self, size: int, smoothing: float, ): super(LabelSmoothingLoss, self).__init__() self.size = size self.criterion = nn.KLDivLoss(reduction="none") self.confidence = 1.0 - smoothing self.smoothing = smoothing def forward(self, x: torch.Tensor, target: torch.Tensor) -> torch.Tensor: batch_size = x.size(0) if self.smoothing == None: return nn.CrossEntropyLoss()(x, target.view(-1)) true_dist = torch.zeros_like(x) true_dist.fill_(self.smoothing / (self.size - 1)) true_dist.scatter_(1, target.view(-1).unsqueeze(1), self.confidence) kl = self.criterion(torch.log_softmax(x, dim=1), true_dist) return kl.sum() / batch_size

这段代码中定义了一个 MLP 模型以及一个 LabelSmoothingLoss 损失函数。MLP 模型包含了多个线性层和 ReLU 激活函数，以及一个 LayerNorm 层和一个 dropout 层。LabelSmoothingLoss 损失函数主要用于解决分类问题中的过拟合问题，它通过对真实标签进行平滑处理来减少模型对噪声的敏感度。这段代码的 forward 方法实现了 MLP 模型的前向传播，以及 LabelSmoothingLoss 的计算。其中，true_dist 是经过平滑处理后的真实标签分布，kl 是计算 KL 散度的结果，最终返回的是 kl 的平均值。