Flover: A Temporal Fusion Framework for Efficient Autoregressive Model Parallel Inference
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In the rapidly evolving field of deep learning, the performance of model inference has become a pivotal aspect as models become more complex and are deployed in diverse applications. Among these, autoregressive models stand out due to their state-of-the-art performance in numerous generative tasks. These models, by design, harness a temporal dependency structure, where the current token's probability distribution is conditioned on preceding tokens. This inherently sequential characteristic, however, adheres to the Markov Chain assumption and lacks temporal parallelism, which poses unique challenges. Particularly in industrial contexts where inference requests, following a Poisson time distribution, necessitate diverse response lengths, this absence of parallelism is more profound. Existing solutions, such as dynamic batching and concurrent model instances, nevertheless, come with severe overheads and a lack of flexibility, these coarse-grained methods fall short of achieving optimal latency and throughput. To address these shortcomings, we propose Flavor – a temporal fusion framework for efficient inference in autoregressive models, eliminating the need for heuristic settings and applies to a wide range of inference scenarios. By providing more fine-grained parallelism on the temporality of requests and employing an efficient memory shuffle algorithm, Flover achieves up to 11x faster inference on GPT models compared to the cutting-edge solutions provided by NVIDIA Triton FasterTransformer. Crucially, by leveraging the advanced tensor parallel technique, Flover proves efficacious across diverse computational landscapes, from single-GPU setups to multi-node scenarios, thereby offering robust performance optimization that transcends hardware boundaries.
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