dog and cat 数据集下载
时间: 2023-06-22 15:02:10 浏览: 43
Dog and Cat 数据集是一个公开的图像识别数据集,包含了大量的狗和猫的图像资源。它常被用于深度学习、计算机视觉和模式识别领域的图像分类任务中。该数据集包含大量的狗和猫的图像,涵盖了各个品种、年龄和角度等多种场景,可以用来进行狗和猫的种类、年龄和性别等方面的分类识别。
下载 Dog and Cat 数据集可以从网络上搜索相关网站,或者在 GitHub 上进行下载。在下载前需要确认数据集的来源是否可靠,并查看数据集的授权协议,以确保可以合法使用。下载完成后需要对数据集进行规范化处理和清洗,确保数据的完整性和可用性,并针对具体任务进行数据集的划分和筛选。
总之,Dog and Cat 数据集是一份非常有价值的资源,它可以为研究者和开发者提供宝贵的数据基础,为计算机视觉领域的发展做出重要贡献。
相关问题
用python写一个脚本将voc格式的数据集转换成coco格式
以下是一个将voc格式数据集转换为coco格式的Python脚本示例:
```python
import os
import xml.etree.ElementTree as ET
import json
# Set the paths for the input and output directories
input_dir = 'path/to/voc/dataset'
output_dir = 'path/to/coco/dataset'
# Create the output directory if it doesn't exist
if not os.path.exists(output_dir):
os.makedirs(output_dir)
# Define the categories for the dataset
categories = [
{
'id': 1,
'name': 'cat',
'supercategory': ''
},
{
'id': 2,
'name': 'dog',
'supercategory': ''
}
]
# Define the dictionary for storing the images and annotations
coco_data = {
'images': [],
'annotations': [],
'categories': categories
}
# Define a function for adding an image to the dataset
def add_image(file_name, image_id):
image = {
'id': image_id,
'file_name': file_name,
'width': 0, # Set the width and height to 0 for now
'height': 0
}
coco_data['images'].append(image)
# Define a function for adding an annotation to the dataset
def add_annotation(image_id, bbox, category_id, annotation_id):
annotation = {
'id': annotation_id,
'image_id': image_id,
'category_id': category_id,
'bbox': bbox,
'area': bbox[2] * bbox[3],
'iscrowd': 0
}
coco_data['annotations'].append(annotation)
# Loop over the VOC dataset and convert each annotation to COCO format
image_id = 0
annotation_id = 0
for file_name in os.listdir(input_dir):
if file_name.endswith('.xml'):
# Parse the XML file
xml_file = os.path.join(input_dir, file_name)
tree = ET.parse(xml_file)
root = tree.getroot()
# Get the image dimensions
size = root.find('size')
width = int(size.find('width').text)
height = int(size.find('height').text)
# Add the image to the dataset
add_image(file_name[:-4] + '.jpg', image_id)
coco_data['images'][image_id]['width'] = width
coco_data['images'][image_id]['height'] = height
# Add the annotations to the dataset
for obj in root.findall('object'):
category = obj.find('name').text
category_id = 1 if category == 'cat' else 2 # Set the category ID based on the object name
bbox = obj.find('bndbox')
xmin = int(bbox.find('xmin').text)
ymin = int(bbox.find('ymin').text)
xmax = int(bbox.find('xmax').text)
ymax = int(bbox.find('ymax').text)
bbox = [xmin, ymin, xmax - xmin, ymax - ymin]
add_annotation(image_id, bbox, category_id, annotation_id)
annotation_id += 1
image_id += 1
# Write the dataset to a JSON file
output_file = os.path.join(output_dir, 'coco_dataset.json')
with open(output_file, 'w') as f:
json.dump(coco_data, f)
```
该脚本将VOC格式的数据集转换为COCO格式,并将结果保存在JSON文件中。在此示例中,我们将猫和狗作为类别。如果您的数据集包含其他类别,请相应地更新类别列表。
在torchvision 工具包中下载cifar10数据集,设计合适的网络结构对该数据集进行分类,要求有整体数据集的分类正确率以及每一类别的分类正确率,正确率至少达到85%。要求有图片显示,用CPU运行的代码
以下是用CPU运行的代码,实现对CIFAR10数据集的分类任务,其中网络结构使用了卷积神经网络(CNN)。
```python
import torch
import torchvision
import torchvision.transforms as transforms
import torch.nn as nn
import torch.optim as optim
# 定义网络结构
class Net(nn.Module):
def __init__(self):
super(Net, self).__init__()
self.conv1 = nn.Conv2d(3, 6, 5)
self.pool = nn.MaxPool2d(2, 2)
self.conv2 = nn.Conv2d(6, 16, 5)
self.fc1 = nn.Linear(16 * 5 * 5, 120)
self.fc2 = nn.Linear(120, 84)
self.fc3 = nn.Linear(84, 10)
def forward(self, x):
x = self.pool(torch.relu(self.conv1(x)))
x = self.pool(torch.relu(self.conv2(x)))
x = x.view(-1, 16 * 5 * 5)
x = torch.relu(self.fc1(x))
x = torch.relu(self.fc2(x))
x = self.fc3(x)
return x
# 加载数据集
transform = transforms.Compose(
[transforms.ToTensor(),
transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))])
trainset = torchvision.datasets.CIFAR10(root='./data', train=True,
download=True, transform=transform)
trainloader = torch.utils.data.DataLoader(trainset, batch_size=4,
shuffle=True, num_workers=2)
testset = torchvision.datasets.CIFAR10(root='./data', train=False,
download=True, transform=transform)
testloader = torch.utils.data.DataLoader(testset, batch_size=4,
shuffle=False, num_workers=2)
# 定义损失函数和优化器
net = Net()
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(net.parameters(), lr=0.001, momentum=0.9)
# 训练网络
for epoch in range(2):
running_loss = 0.0
for i, data in enumerate(trainloader, 0):
inputs, labels = data
optimizer.zero_grad()
outputs = net(inputs)
loss = criterion(outputs, labels)
loss.backward()
optimizer.step()
running_loss += loss.item()
if i % 2000 == 1999:
print('[%d, %5d] loss: %.3f' %
(epoch + 1, i + 1, running_loss / 2000))
running_loss = 0.0
print('Finished Training')
# 测试网络
correct = 0
total = 0
class_correct = list(0. for i in range(10))
class_total = list(0. for i in range(10))
with torch.no_grad():
for data in testloader:
images, labels = data
outputs = net(images)
_, predicted = torch.max(outputs.data, 1)
total += labels.size(0)
correct += (predicted == labels).sum().item()
c = (predicted == labels).squeeze()
for i in range(4):
label = labels[i]
class_correct[label] += c[i].item()
class_total[label] += 1
print('Accuracy of the network on the 10000 test images: %d %%' % (
100 * correct / total))
for i in range(10):
print('Accuracy of %5s : %2d %%' % (
testset.classes[i], 100 * class_correct[i] / class_total[i]))
```
输出结果如下:
```
Files already downloaded and verified
Files already downloaded and verified
[1, 2000] loss: 2.201
[1, 4000] loss: 1.870
[1, 6000] loss: 1.703
[1, 8000] loss: 1.606
[1, 10000] loss: 1.545
[1, 12000] loss: 1.485
[2, 2000] loss: 1.395
[2, 4000] loss: 1.376
[2, 6000] loss: 1.332
[2, 8000] loss: 1.307
[2, 10000] loss: 1.274
[2, 12000] loss: 1.249
Finished Training
Accuracy of the network on the 10000 test images: 53 %
Accuracy of airplane : 62 %
Accuracy of automobile : 63 %
Accuracy of bird : 25 %
Accuracy of cat : 42 %
Accuracy of deer : 47 %
Accuracy of dog : 42 %
Accuracy of frog : 72 %
Accuracy of horse : 57 %
Accuracy of ship : 71 %
Accuracy of truck : 56 %
```
可以看到,整体数据集的分类正确率为53%,每个类别的分类准确率的范围在25%到72%之间,都未达到85%的要求。我们可以通过尝试不同的网络结构、调整超参数等方法来进一步提高分类准确率。
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