如何在 JupyterLab 中解决这个 KeyError:0？

Question

我在 Google Colab 中运行此代码，它运行良好。但是当我在 JupyterLab 中运行它时，会发生这个 keyerror:0。我该如何解决这个问题？

import sys
import sklearn
import matplotlib as mpl
import matplotlib.pyplot as plt
mpl.rc('axes', labelsize=14)
mpl.rc('xtick', labelsize=12)
mpl.rc('ytick', labelsize=12)

# Where to save the figures
PROJECT_ROOT_DIR = "."
CHAPTER_ID = "classification"
IMAGES_PATH = os.path.join(PROJECT_ROOT_DIR, "images", CHAPTER_ID)
os.makedirs(IMAGES_PATH, exist_ok=True)

def save_fig(fig_id, tight_layout=True, fig_extension="png", resolution=300):
    path = os.path.join(IMAGES_PATH, fig_id + "." + fig_extension)
    print("Saving figure", fig_id)
    if tight_layout:
        plt.tight_layout()
    plt.savefig(path, format=fig_extension, dpi=resolution)

from sklearn.datasets import fetch_openml
mnist = fetch_openml('mnist_784', version=1)
X, y = mnist["data"], mnist["target"]

%matplotlib inline
import matplotlib as mpl
import matplotlib.pyplot as plt

some_digit = X[0]
some_digit_image = some_digit.reshape(28, 28)
plt.imshow(some_digit_image, cmap=mpl.cm.binary)
plt.axis("off")

save_fig("some_digit_plot")
plt.show()

This is the KeyError:0 shown in the JupyterLab

Answer 1

根据给定的屏幕截图，这实际上是X 的pandas key 错误，但是在给定的代码中没有pandas 对X 的引用，这意味着X 的值不知何故被错误损坏了.

因此，我建议您重新启动 jupyter 内核并重试。

注意：根据您的代码type(X[0]) 将是numpy.ndarray