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Never repeating your training data is what you'd ideally like to do for training basically any ML model. If you do that you don't really need to worry about ove
by thunderbird120 3y ago
Never repeating your training data is what you'd ideally like to do for training basically any ML model. If you do that you don't really need to worry about overfitting since the model is constantly trying to fit a stream of new data. To reduce its training error it actually has to model the structure of the data rather than just memorizing it since each training step will involve data it has never seen before. Larger models are more prone to overfitting but also learn several orders of magnitude faster. If you can use larger models without being concerned about overfitting it's generally desirable to do so. It's just that most tasks don't actually have enough data to support doing that. Thankfully, text modeling does have enough data.
- HarHarVeryFunny 3y agoThanks. So when, for example, we train an ImageNet model over multiple epochs using rotation/scaling/etc augmentation, it's really better to think of this as one epoch over a unique set of images than multi-epoch per se ? I was really thinking of augmentation as a way to get coverage over the input space rather than ensuring the training data doesn't repeat, but I guess it serves both purposes. It does still seem that many LLMs are overfitting / memorizing to a fair degree though - maybe just because they are still too big for the amount of data they are trained on ? It seems like a bit of a balancing act - wanting an LLM to generalize, but yet also to serve as somewhat of a knowledge store for rare data it has only seen once.