Downsampling in neural networks
Depending on your database, some possibilities are applying PCA, resampling or filtering time series, reducing the size of the images, etc.
https://machinelearningmastery.com/how-to-improve-neural-network-stability-and-modeling-performance-with-data-scaling/
https://machinelearningmastery.com/tactics-to-combat-imbalanced-classes-in-your-machine-learning-dataset/
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