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ALTO: Efficient Network Orchestrator for Compound AI Systems


核心概念
ALTO is a network orchestrator that efficiently serves compound AI systems, optimizing throughput and latency by streaming intermediate outputs between stages.
要約

ALTO is designed to optimize the serving of compound AI systems, particularly those involving generative language models. By streaming partial outputs between distributed pipeline stages, ALTO addresses challenges related to correctness and load balancing. The system introduces aggregation-aware routing and distributed prompt-aware scheduling to enhance performance. Experimental results demonstrate significant improvements in throughput and latency for complex chatbot verification pipelines.

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統計
ALTO increases throughput by up to 3× for a fixed latency target of 4 seconds/request. ALTO reduces tail latency by 1.8× compared to baseline serving approaches.
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by Keshav Santh... 場所 arxiv.org 03-08-2024

https://arxiv.org/pdf/2403.04311.pdf
ALTO

深掘り質問

How can ALTO's approach to streaming partial outputs be applied to other types of AI systems?

ALTO's approach to streaming partial outputs can be extended and applied to various other types of AI systems beyond compound language models. For instance, in image processing pipelines where different stages perform tasks like feature extraction, object detection, or image classification, streaming intermediate results could enhance throughput and reduce latency. By allowing the incremental processing of images through the pipeline stages, similar benefits in terms of performance improvements could be achieved. Moreover, in recommendation systems that involve multiple steps such as user profiling, item matching, and result ranking, streaming intermediate data between these stages could optimize the system's efficiency. This would enable real-time updates on recommendations based on users' interactions with the system. Additionally, in reinforcement learning setups where agents interact with an environment over time steps and require continuous feedback for decision-making processes, streaming partial outputs could facilitate faster learning cycles by providing immediate insights from each step taken by the agent. In summary, ALTO's methodology of streaming partial outputs can find applications across a wide range of AI systems beyond compound language models by enhancing performance metrics such as throughput and latency while enabling real-time processing capabilities.

What potential drawbacks or limitations might arise from relying heavily on streaming partial outputs in compound AI systems?

While leveraging streaming partial outputs offers significant advantages in terms of improved throughput and reduced latency for compound AI systems like those involving generative language models processed through multiple stages or components sequentially; there are certain drawbacks and limitations associated with this approach: Complexity: Implementing a robust system that efficiently streams intermediate results between distributed pipeline stages requires intricate coordination mechanisms which may introduce complexity into the overall architecture. State Management: Handling stateful operations within a streamed environment becomes challenging as maintaining consistency across distributed instances while aggregating results can lead to increased overheads. Load Balancing Issues: Ensuring equitable distribution of workloads among different instances when dealing with varying fan-outs due to dynamic prompt frequencies poses load balancing challenges that need careful consideration. Scalability Concerns: As the volume of data increases or when dealing with high-throughput scenarios, scaling up a system reliant on heavy streaming might encounter scalability issues related to resource allocation and network bandwidth constraints. Fault Tolerance: Streaming introduces vulnerabilities related to data loss during transmission failures or disruptions which necessitates robust error handling mechanisms for fault tolerance.

How might the concept of distributed prompt-aware scheduling impact the scalability and efficiency of large language models in real-world applications?

The concept of distributed prompt-aware scheduling has profound implications for enhancing both scalability and efficiency aspects when deploying large language models (LLMs) in real-world applications: Resource Optimization: By dynamically allocating resources based on prompts' characteristics such as output size or processing time requirements using prompt-aware scheduling algorithms; it enables efficient utilization leading to better resource optimization. Improved Throughput: Prioritizing requests sharing common prefixes (prompt locality) ensures maximized batch processing opportunities resulting in enhanced throughput rates especially beneficial for high-demand scenarios. Reduced Latency: Efficient routing strategies guided by prompt statistics help minimize queuing delays thereby reducing end-to-end latency crucial for interactive applications requiring quick responses. Scalability Enhancements: The ability to adaptively distribute workload across LM instances based on prompts' needs allows seamless scaling up/down depending on demand fluctuations ensuring scalable operations without compromising performance. 5Enhanced User Experience: Real-time adaptation enabled by prompt-aware scheduling translates into smoother user experiences characterized by quicker response times fostering higher user engagement levels particularly critical for interactive conversational interfaces powered by LLMs.
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