[英]SKlearn dataset , Mnist random sample plotting is not working? cannot find error
采樣隨機 mnist 數據集,但顯示錯誤,告訴我我哪里做錯了?
import sklearn
import pandas as pd
import matplotlib.pyplot as plt
import numpy as np
from sklearn.datasets import fetch_openml
mnist = fetch_openml('mnist_784')
y = mnist.target
X = mnist.data
fig, ax = plt.subplots(2, 5)
ax = ax.flatten()
for i in range(10):
im_idx = np.argwhere(y == i)[0]
print(im_idx)
plottable_image = np.reshape(X[im_idx], (28, 28))
ax[i].imshow(plottable_image, cmap='gray_r')
您得到結果的錯誤是因為np.argwhere(y == i)
返回一個空數組,那是因為您試圖在填充string
值的y
和作為int
i
之間進行比較。
以下更改將修復它:
im_idx = np.argwhere(y == str(i))[0]
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