Sequence Parallelism
Sequence parallelism is a method for handling long sequences by distributing the attention computation across multiple processing units. When calculating the attention of a query at position with respect to the keys and values , the matrices and are partitioned row-wise into sets of sub-matrices, denoted as and , where each sub-matrix corresponds to a segment of the sequence. Each corresponding pair of sub-matrices, and , is then allocated to a separate computing node (e.g., a GPU in a cluster). The assigned nodes execute in parallel, effectively parallelizing the attention operation for the entire sequence.
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Ch.2 Generative Models - Foundations of Large Language Models
Foundations of Large Language Models
Foundations of Large Language Models Course
Computing Sciences
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Sequence Parallelism
A team is tasked with using a transformer-based model to summarize an entire book. The standard model architecture cannot process the entire book's text at once due to its length. The team implements a strategy where the book is broken into smaller, manageable chunks, each chunk is processed by the model, and the outputs are then combined. What is the fundamental computational bottleneck in the standard architecture that this segmentation strategy is designed to circumvent?
Analyzing a Hierarchical Transformer for Genomic Data
Applying a Segmentation Strategy for Long-Form Audio
Distributed Computation of Weighted Value Sums
Single-Query Attention Computation with Multiplicative Scaling
Calculating an Attention Output Vector
In a self-attention mechanism, the output for a given input element is a weighted sum of 'value' vectors from all elements in the sequence. Consider the calculation for the word 'sat' in the phrase 'The cat sat on the mat'. If the attention weights from 'sat' to the other words are: 'The': 0.05, 'cat': 0.45, 'sat': 0.05, 'on': 0.0, 'the': 0.0, 'mat': 0.45. Which of the following statements best describes the resulting output vector for 'sat'?
In a self-attention mechanism, the output for a specific token is calculated as a weighted sum of 'value' vectors from all tokens in the sequence. If the attention weight connecting a query token to a specific value token is exactly zero, that value token has no contribution to the final output for the query token.
Sequence Parallelism
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Resolving Memory Bottlenecks in Attention Mechanisms
A machine learning team is processing an extremely long input sequence and wants to parallelize the self-attention computation across 4 GPUs using sequence parallelism. For a single attention head, which of the following strategies correctly describes how the Key (K) and Value (V) matrices should be partitioned and distributed?
Flawed Parallel Attention Implementation
Computing Attention Weights in Sequence Parallelism
Motivation for Sequence Parallelism