Image data hasn't been included, since it contained a total of (10000+5000) files, and uploading in batches of 100 would be a very tedious undertaking.
The image data can thus be found here: https://www.kaggle.com/c/mnist-but-chinese/data
A copy of the same notebook on the Kaggle kernel can be found here: https://www.kaggle.com/youteek/chinese-mnist-lenet-5