Asked about Data is the model

What matters most for pretraining quality?

An answer that works

Increasingly the data: deduplication, quality filtering and the mixture of sources. Architectures have largely converged, and much of the remaining gap between models comes from what they were trained on.

Reading an answer is not being able to give one. The section that teaches this is Data is the model, 4 hours of Pretraining.

Learn this properly