Optimizing Training with FlashAttention varlen🔒 SSL Verified

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"I’ve come to think of varlen primarily as the most efficient FlashAttention variant for training (it’s not used for generating tokens) because it handles our technique of “processing a batch of examples” more efficiently–by treating them as one long concatenated sequence, rather than adding an additional “batch dimension” to the input tensors, which handles varying sequence lengths less naturally."

"Recent models like DeepSeek-V3 and Moonshot’s Kimi-K2, built using Multihead Latent Attention (MLA), have shown that constraining the input spaces of attention heads can be both effective and efficient. They project the input token vector–size 7,168–down to just 512 dimensions for keys and values, and to 1,536 for queries. Despite this aggressive compression, performance holds up well enough to support these frontier-scale models."

"Transformers store, retrieve, and modify data along different feature directions in their model space, via projections."

"Multihead Latent Attention (MLA), introduced by DeepSeek in their V2 model, is an alternative to standard attention (and other variants such as MQA and GQA) which dramatically reduces memory bandwidth requirements for the attention calculations."

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