然而,传统的注意力机制在长序列处理时会消耗大量内存和计算资源。为了解决这个问题,Tri Dao等人提出了FlashAttention,这是一种快速且内存高效的注意力机制。本文将介绍FlashAttention及其改进版FlashAttention-2的核心概念、安装方法和使用示例。 论文介绍 FlashAttention: Fast and Memory-Efficient Exact Attention with IO...
1.2 Flash Attention性能 Flash Attention是可以用于训练之中的,他实现了注意力Forward和Backward的加速计算。 1.3 算法动机 HBM(High Bandwidth Memory)比如A100-40GB版本里的HBM就是显存40GB GPU计算实际工作在SRAM(Static Random-Access Memory) SRAM19TB/S比HBM1.5TB/S 计算速度快12.67倍,但只有20MB可以使用 目的:...
MI200 or MI300 GPUs. Datatype fp16 and bf16 Both forward's and backward's head dimensions up to 256. Triton Backend The Triton implementation of theFlash Attention v2is currently a work in progress. It supports AMD's CDNA (MI200, MI300) and RDNA GPU's using fp16, bf16 and fp32 ...
该方法缓存了之前forward的一些中间结果，节约了大部分运算（如MatMul），但是attention操作是个例外。
LLM inference (or “decoding”) is an iterative process: tokens are generated one at a time. Generating full sentences of N tokens requires N forward passes through the model. Fortunately, it is possible to cache previously calculated tokens: this means that a single generation step does not ...
LLM推理中的主要操作如下图所示:linearprojection(①和⑤)、attention(②、③和④)和feedforward network(⑥)。为简单起见,这里忽略了position embedding、non-linear activation、mask等操作。本文将LLM推理时对Prompt的处理过程称为prefillphase,第二阶段预测过程称为decodephase。这两个阶段的算子基本一致,主要是输入数...
(nheads,) or (batch_size, nheads), fp32. A bias of (-alibi_slope * |i - j|) is added tothe attention score of query i and key j.deterministic: bool. Whether to use the deterministic implementation of the backward pass,which is slightly slower and uses more memory. The forward ...
Flashforward: Created by Brannon Braga, David S. Goyer. With Courtney B. Vance, Joseph Fiennes, Jack Davenport, Zachary Knighton. A special task force in the FBI investigates after every person on Earth simultaneously blacks out and awakens with a short
Mobile storage's big leap forward UFS 4.0 : Flagship storage. For flagship smartphones Take your flagship smartphones further. UFS 4.0 is flash storage built for a smarter, slimmer, more powerful era of mobile. With a massive 1TB capacity, it delivers double the speed of the previous generati...
23. (intr) to come rapidly (into the mind or vision) 24. (intr; foll by out or up) to appear like a sudden light: his anger really flashes out at times. 25. a. to signal or communicate very fast: to flash a message. b. to signal by use of a light, such as car headli...