"Looking holistically, our end-to-end LLM pretraining pipeline has become nearly 4x more compute-efficient in the past ten months." I did not fully understand

"Looking holistically, our end-to-end LLM pretraining pipeline has become nearly 4x more compute-efficient in the past ten months." I did not fully understand the technical details in the training efficiency section, but love this. Cost of training is outrageously high, and hopefully it will start to follow Moore's law.