Fix deprecated sklearn fetch_mldata import

[ThomasJButler]

Problem

The generative_adversarial_network.py script fails to run due to a deprecated import:

Error:

ImportError: cannot import name 'fetch_mldata' from 'sklearn.datasets'
fetch_mldata was deprecated in scikit-learn 0.20 and removed in scikit-learn 1.2.

Solution

• Replaced fetch_mldata with fetch_openml for MNIST data loading
• Updated the function call to use 'mnist_784' dataset with version=1 and as_frame=False parameters
• This maintains the same data structure and functionality while using the modern API

Testing

• Script imports successfully
• GAN initialises without errors
• Training runs successfully with the new data loading method
• Data format remains compatible with existing code

Changes

• Line 8: from sklearn.datasets import fetch_mldata → from sklearn.datasets import fetch_openml
• Line 81: mnist = fetch_mldata('MNIST original') → mnist = fetch_openml('mnist_784', version=1, as_frame=False)

This fix ensures compatibility with modern scikit-learn versions while maintaining backward compatibility with the existing codebase.