自己搭建resnet18网络并加载torchvision自带权重的操作
直接搭建网络必须与torchvision自带的网络的权重也就是pth文件的结构、尺寸和变量命名完全一致,否则无法加载权重文件。
此时可比较2个字典逐一加载,详见
pytorch加载预训练模型与自己模型不匹配的解决方案
import torch import torchvision import cv2 as cv from utils.utils import letter_box from model.backbone import ResNet18 model1 = ResNet18(1) model2 = torchvision.models.resnet18(progress=False) fc = model2.fc model2.fc = torch.nn.Linear(512, 1) # print(model) model_dict1 = model1.state_dict() model_dict2 = torch.load('resnet18.pth') model_list1 = list(model_dict1.keys()) model_list2 = list(model_dict2.keys()) len1 = len(model_list1) len2 = len(model_list2) minlen = min(len1, len2) for n in range(minlen): if model_dict1[model_list1[n]].shape != model_dict2[model_list2[n]].shape: continue model_dict1[model_list1[n]] = model_dict2[model_list2[n]] model1.load_state_dict(model_dict1) missing, unspected = model2.load_state_dict(model_dict2) image = cv.imread('zhn1.jpg') image = letter_box(image, 224) image = image[:, :, ::-1].transpose(2, 0, 1) print('Network loading complete.') model1.eval() model2.eval() with torch.no_grad(): image = torch.tensor(image/256, dtype=torch.float32).unsqueeze(0) predict1 = model1(image) predict2 = model2(image) print('finished') # torch.save(model.state_dict(), 'resnet18.pth')
以上为全部程序,最终可测试原模型与加载了自带权重的自定义模型的输出是否相等。
补充:使用Pytorch搭建ResNet分类网络并基于迁移学习训练
如果stride=1,padding=1
卷积处理是不会改变特征矩阵的高和宽
使用BN层时
卷积中的参数bias置为False(有无偏置BN层的输出都相同),BN层放在conv层和relu层的中间
复习BN层:
Batch Norm 层是对每层数据归一化后再进行线性变换改善数据分布, 其中的线性变换是可学习的.
Batch Norm优点:减轻过拟合;改善梯度传播(权重不会过高或过低)容许较高的学习率,能够提高训练速度。减轻对初始化权重的强依赖,使得数据分布在激活函数的非饱和区域,一定程度上解决梯度消失问题。作为一种正则化的方式,在某种程度上减少对dropout的使用。
Batch Norm层摆放位置:在激活层(如 ReLU )之前还是之后,没有一个统一的定论。
BN层与 Dropout 合作:Batch Norm的提出使得dropout的使用减少,但是Batch Norm不能完全取代dropout,保留较小的dropout率,如0.2可能效果更佳。
为什么要先normalize再通过γ,β线性变换恢复接近原来的样子,这不是多此一举吗?
在一定条件下可以纠正原始数据的分布(方差,均值变为新值γ,β),当原始数据分布足够好时就是恒等映射,不改变分布。如果不做BN,方差和均值对前面网络的参数有复杂的关联依赖,具有复杂的非线性。在新参数 γH′ + β 中仅由 γ,β 确定,与前边网络的参数无关,因此新参数很容易通过梯度下降来学习,能够学习到较好的分布。
迁移学习导入权重和下载权重:
import torchvision.models.resnet#ctrl+鼠标左键点击即可下载权重 net = resnet34()#一开始不能设置全连接层的输出种类为自己想要的,必须先将模型参数载入,再修改全连接层 # 官方提供载入预训练模型的方法 model_weight_path = "./resnet34-pre.pth"#权重路径 missing_keys, unexpected_keys = net.load_state_dict(torch.load(model_weight_path), strict=False)#载入模型权重 inchannel = net.fc.in_features net.fc = nn.Linear(inchannel, 5)#重新确定全连接层
完整代码:
model部分:
import torch.nn as nn import torch class BasicBlock(nn.Module):#对应18层和34层所对应的残差结构(既要有实线残差结构功能,也要有虚线残差结构功能) expansion = 1#残差结构主分支上的三个卷积层是否相同,相同为1,第三层是一二层四倍则为4 def __init__(self, in_channel, out_channel, stride=1, downsample=None):#downsample代表虚线残差结构选项 super(BasicBlock, self).__init__() self.conv1 = nn.Conv2d(in_channels=in_channel, out_channels=out_channel, kernel_size=3, stride=stride, padding=1, bias=False) self.bn1 = nn.BatchNorm2d(out_channel) self.relu = nn.ReLU() self.conv2 = nn.Conv2d(in_channels=out_channel, out_channels=out_channel, kernel_size=3, stride=1, padding=1, bias=False) self.bn2 = nn.BatchNorm2d(out_channel) self.downsample = downsample def forward(self, x): identity = x if self.downsample is not None: identity = self.downsample(x)#得到捷径分支的输出 out = self.conv1(x) out = self.bn1(out) out = self.relu(out) out = self.conv2(out) out = self.bn2(out) out += identity out = self.relu(out) return out#得到残差结构的最终输出 class Bottleneck(nn.Module):#对应50层、101层和152层所对应的残差结构 expansion = 4#第三层卷积核个数是第一层和第二层的四倍 def __init__(self, in_channel, out_channel, stride=1, downsample=None): super(Bottleneck, self).__init__() self.conv1 = nn.Conv2d(in_channels=in_channel, out_channels=out_channel, kernel_size=1, stride=1, bias=False) self.bn1 = nn.BatchNorm2d(out_channel) self.conv2 = nn.Conv2d(in_channels=out_channel, out_channels=out_channel, kernel_size=3, stride=stride, bias=False, padding=1) self.bn2 = nn.BatchNorm2d(out_channel) self.conv3 = nn.Conv2d(in_channels=out_channel, out_channels=out_channel*self.expansion, kernel_size=1, stride=1, bias=False) self.bn3 = nn.BatchNorm2d(out_channel*self.expansion) self.relu = nn.ReLU(inplace=True) self.downsample = downsample def forward(self, x): identity = x if self.downsample is not None: identity = self.downsample(x) out = self.conv1(x) out = self.bn1(out) out = self.relu(out) out = self.conv2(out) out = self.bn2(out) out = self.relu(out) out = self.conv3(out) out = self.bn3(out) out += identity out = self.relu(out) return out class ResNet(nn.Module):#定义整个网络的框架部分 #blocks_num是残差结构的数目,是一个列表参数,block对应哪个残差模块 def __init__(self, block, blocks_num, num_classes=1000, include_top=True): super(ResNet, self).__init__() self.include_top = include_top self.in_channel = 64#通过第一个池化层后所得到的特征矩阵的深度 self.conv1 = nn.Conv2d(3, self.in_channel, kernel_size=7, stride=2, padding=3, bias=False) self.bn1 = nn.BatchNorm2d(self.in_channel) self.relu = nn.ReLU(inplace=True) self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1) self.layer1 = self._make_layer(block, 64, blocks_num[0]) self.layer2 = self._make_layer(block, 128, blocks_num[1], stride=2) self.layer3 = self._make_layer(block, 256, blocks_num[2], stride=2) self.layer4 = self._make_layer(block, 512, blocks_num[3], stride=2) if self.include_top: self.avgpool = nn.AdaptiveAvgPool2d((1, 1)) # output size = (1, 1) self.fc = nn.Linear(512 * block.expansion, num_classes) for m in self.modules(): if isinstance(m, nn.Conv2d): nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu') def _make_layer(self, block, channel, block_num, stride=1):#channel:残差结构中,第一个卷积层所使用的卷积核的个数 downsample = None if stride != 1 or self.in_channel != channel * block.expansion:#18层和34层会直接跳过这个if语句 downsample = nn.Sequential( nn.Conv2d(self.in_channel, channel * block.expansion, kernel_size=1, stride=stride, bias=False), nn.BatchNorm2d(channel * block.expansion)) layers = [] layers.append(block(self.in_channel, channel, downsample=downsample, stride=stride)) self.in_channel = channel * block.expansion for _ in range(1, block_num): layers.append(block(self.in_channel, channel)) return nn.Sequential(*layers) def forward(self, x): x = self.conv1(x) x = self.bn1(x) x = self.relu(x) x = self.maxpool(x) x = self.layer1(x) x = self.layer2(x) x = self.layer3(x) x = self.layer4(x) if self.include_top:#默认是true x = self.avgpool(x) x = torch.flatten(x, 1) x = self.fc(x) return x def resnet34(num_classes=1000, include_top=True): return ResNet(BasicBlock, [3, 4, 6, 3], num_classes=num_classes, include_top=include_top) def resnet101(num_classes=1000, include_top=True): return ResNet(Bottleneck, [3, 4, 23, 3], num_classes=num_classes, include_top=include_top)
训练部分:
import torch import torch.nn as nn from torchvision import transforms, datasets import json import matplotlib.pyplot as plt import os import torch.optim as optim from model import resnet34, resnet101 import torchvision.models.resnet#ctrl+鼠标左键点击即可下载权重 device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") print(device) data_transform = { "train": transforms.Compose([transforms.RandomResizedCrop(224), transforms.RandomHorizontalFlip(), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])]),#和官网初始化方法保持一致 "val": transforms.Compose([transforms.Resize(256), transforms.CenterCrop(224), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])])} data_root = os.path.abspath(os.path.join(os.getcwd(), "../..")) # get data root path image_path = data_root + "/data_set/flower_data/" # flower data set path train_dataset = datasets.ImageFolder(root=image_path+"train", transform=data_transform["train"]) train_num = len(train_dataset) # {'daisy':0, 'dandelion':1, 'roses':2, 'sunflower':3, 'tulips':4} flower_list = train_dataset.class_to_idx cla_dict = dict((val, key) for key, val in flower_list.items()) # write dict into json file json_str = json.dumps(cla_dict, indent=4) with open('class_indices.json', 'w') as json_file: json_file.write(json_str) batch_size = 16 train_loader = torch.utils.data.DataLoader(train_dataset, batch_size=batch_size, shuffle=True, num_workers=0) validate_dataset = datasets.ImageFolder(root=image_path + "val", transform=data_transform["val"]) val_num = len(validate_dataset) validate_loader = torch.utils.data.DataLoader(validate_dataset, batch_size=batch_size, shuffle=False, num_workers=0) net = resnet34()#一开始不能设置全连接层的输出种类为自己想要的,必须先将模型参数载入,再修改全连接层 # 官方提供载入预训练模型的方法 model_weight_path = "./resnet34-pre.pth"#权重路径 missing_keys, unexpected_keys = net.load_state_dict(torch.load(model_weight_path), strict=False)#载入模型权重 inchannel = net.fc.in_features net.fc = nn.Linear(inchannel, 5)#重新确定全连接层 net.to(device) loss_function = nn.CrossEntropyLoss() optimizer = optim.Adam(net.parameters(), lr=0.0001) best_acc = 0.0 save_path = './resNet34.pth' for epoch in range(3): # train net.train()#控制BN层状态 running_loss = 0.0 for step, data in enumerate(train_loader, start=0): images, labels = data optimizer.zero_grad() logits = net(images.to(device)) loss = loss_function(logits, labels.to(device)) loss.backward() optimizer.step() # print statistics running_loss += loss.item() # print train process rate = (step+1)/len(train_loader) a = "*" * int(rate * 50) b = "." * int((1 - rate) * 50) print("\rtrain loss: {:^3.0f}%[{}->{}]{:.4f}".format(int(rate*100), a, b, loss), end="") print() # validate net.eval()#控制BN层状态 acc = 0.0 # accumulate accurate number / epoch with torch.no_grad(): for val_data in validate_loader: val_images, val_labels = val_data outputs = net(val_images.to(device)) # eval model only have last output layer # loss = loss_function(outputs, test_labels) predict_y = torch.max(outputs, dim=1)[1] acc += (predict_y == val_labels.to(device)).sum().item() val_accurate = acc / val_num if val_accurate > best_acc: best_acc = val_accurate torch.save(net.state_dict(), save_path) print('[epoch %d] train_loss: %.3f test_accuracy: %.3f' % (epoch + 1, running_loss / step, val_accurate)) print('Finished Training')
预测部分:
import torch from model import resnet34 from PIL import Image from torchvision import transforms import matplotlib.pyplot as plt import json device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") data_transform = transforms.Compose( [transforms.Resize(256), transforms.CenterCrop(224), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])])#采用和训练方法一样的标准化处理 # load image img = Image.open("../aa.jpg") plt.imshow(img) # [N, C, H, W] img = data_transform(img) # expand batch dimension img = torch.unsqueeze(img, dim=0) # read class_indict try: json_file = open('./class_indices.json', 'r') class_indict = json.load(json_file) except Exception as e: print(e) exit(-1) # create model model = resnet34(num_classes=5) # load model weights model_weight_path = "./resNet34.pth" model.load_state_dict(torch.load(model_weight_path, map_location=device))#载入训练好的模型参数 model.eval()#使用eval()模式 with torch.no_grad():#不跟踪损失梯度 # predict class output = torch.squeeze(model(img))#压缩batch维度 predict = torch.softmax(output, dim=0)#通过softmax得到概率分布 predict_cla = torch.argmax(predict).numpy()#寻找最大值所对应的索引 print(class_indict[str(predict_cla)], predict[predict_cla].numpy())#打印类别信息和概率 plt.show()
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。