n = 5 imgs = train_features[0:n] + train_labels[0:n] imgs = [img.permute(1,2,0) for img in imgs] d2l.show_images(imgs, 2, n);
时间: 2024-05-28 11:11:25 浏览: 104
这段代码是用来显示训练集中前5张图片及其对应的标签的。具体来说,它先将前5张图片和标签取出来,然后将图片的通道维度移到最后一个维度上,最后调用d2l.show_images()函数将图片显示出来。
其中,d2l.show_images()函数是一个在d2lzh_pytorch包中定义的函数,它可以将多张图片按照给定的行数和列数排列,并显示出来。在这里,我们将行数设为2,列数设为n,即每行显示两张图片,一共显示n行。
相关问题
解释一下 for frame in current_imgs_path: img = self.loader(frame) if self.transform is not None: img = self.transform(img) current_imgs.append(img) current_label = self.transform(current_label) # print(current_label.shape) batch_cur_imgs = np.stack(current_imgs, axis=0) return batch_cur_imgs, current_label
这段代码的作用是:对于current_imgs_path中的每个frame,使用self.loader方法读取图片,并将其应用于self.transform(如果transform非空),最后将处理后的图片添加到current_imgs列表中。同时,使用self.transform方法处理current_label。
# Load the dataset dataset = ImageFolder("D:/wjd/2", transform=transform) dataloader = DataLoader(dataset, batch_size=32, shuffle=True) # Extract feature vectors features = [] with torch.no_grad(): for images, _ in dataloader: outputs = model(images) features.append(outputs) features = torch.cat(features, dim=0) features = features.numpy() # Perform clustering using GMM gmm = GaussianMixture(n_components='auto', covariance_type='full') labels = gmm.fit_predict(features) # Visualize the clustering result plt.scatter(features[:, 0], features[:, 1], c=labels) plt.show() # Save the clustering result save_path = "D:/jk" if not os.path.exists(save_path): os.mkdir(save_path) for i in set(labels): class_path = os.path.join(save_path, str(i)) if not os.path.exists(class_path): os.mkdir(class_path) for j in range(len(labels)): if labels[j] == i: img_path = dataset.imgs[j][0] img_name = os.path.basename(img_path) save_name = os.path.join(class_path, img_name) shutil.copy(img_path, save_name) ,这段代码出现了这个问题raise InvalidParameterError( sklearn.utils._param_validation.InvalidParameterError: The 'n_components' parameter of GaussianMixture must be an int in the range [1, inf). Got 'auto' instead,应该如何改进啊
该错误是因为 `n_components` 参数应该是一个整数,表示需要用多少个高斯分布来拟合数据。但是在这里,传递了一个字符串 `auto`,表示使用默认的值,即自动选择高斯分布的数量。但是,这个值不支持在 `GaussianMixture` 中使用。
要解决这个问题,可以将 `n_components` 参数设置为一个整数,可以根据数据的大小和特征数量进行调整。例如,可以根据以下方法来计算一个较为合理的值:
```python
import numpy as np
from sklearn.mixture import GaussianMixture
# Load the dataset
dataset = ImageFolder("D:/wjd/2", transform=transform)
dataloader = DataLoader(dataset, batch_size=32, shuffle=True)
# Extract feature vectors
features = []
with torch.no_grad():
for images, _ in dataloader:
outputs = model(images)
features.append(outputs)
features = torch.cat(features, dim=0).numpy()
# Determine the number of components
bic = []
for n_components in range(1, 10):
gmm = GaussianMixture(n_components=n_components, covariance_type='full')
gmm.fit(features)
bic.append(gmm.bic(features))
n_components = np.argmin(bic) + 1
# Perform clustering using GMM
gmm = GaussianMixture(n_components=n_components, covariance_type='full')
labels = gmm.fit_predict(features)
# Visualize the clustering result
plt.scatter(features[:, 0], features[:, 1], c=labels)
plt.show()
# Save the clustering result
save_path = "D:/jk"
if not os.path.exists(save_path):
os.mkdir(save_path)
for i in set(labels):
class_path = os.path.join(save_path, str(i))
if not os.path.exists(class_path):
os.mkdir(class_path)
for j in range(len(labels)):
if labels[j] == i:
img_path = dataset.imgs[j][0]
img_name = os.path.basename(img_path)
save_name = os.path.join(class_path, img_name)
shutil.copy(img_path, save_name)
```
在这个代码中,我们首先使用 BIC 准则来确定 `n_components` 的最佳值。然后使用 `n_components` 在 `GaussianMixture` 中进行聚类。这应该能够解决这个问题。
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