Scikit 学习图像分类器

Question

我写了这段代码：

# Import datasets, classifiers and performance metrics
from sklearn import datasets, svm, metrics
import matplotlib.image as mpimg

imgs=[[mpimg.imread('sci/img/1.jpg'),mpimg.imread('sci/img/2.jpg')],[mpimg.imread('sci/img/3.jpg'),mpimg.imread('sci/img/4.jpg')]]
targ=[1,2]

# To apply a classifier on this data, we need to flatten the image, to
# turn the data in a (samples, feature) matrix:
n_samples = len(imgs)
data = imgs.reshape((n_samples, -1))

# Create a classifier: a support vector classifier
classifier = svm.SVC(gamma=0.001)

# We learn the digits on the first half of the digits
classifier.fit(data, targ)

# Now predict the value of the digit on the second half:
expected = targ
predicted = classifier.predict(data)

print("Classification report for classifier %s:\n%s\n"
      % (classifier, metrics.classification_report(expected, predicted)))
print("Confusion matrix:\n%s" % metrics.confusion_matrix(expected, predicted))

我读到了这个错误：

AttributeError: 'list' 对象没有属性 'reshape'

我认为构建图像数组是错误的，因为它已解决？

Answer 1

data = imgs.reshape((n_samples, -1))

在这里，您尝试在 Python 列表上应用方法 reshape。

但是，imgs 应该是 numpy array。因此，您应该替换

imgs = [[mpimg.imread('sci/img/1.jpg'), mpimg.imread('sci/img/2.jpg')],[mpimg.imread('sci/img/3.jpg'), mpimg.imread('sci/img/4.jpg')]]

与

import numpy as np 
imgs = np.array([[mpimg.imread('sci/img/1.jpg'), mpimg.imread('sci/img/2.jpg')], [mpimg.imread('sci/img/3.jpg'), mpimg.imread('sci/img/4.jpg')]])