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星期二

  1. vLLM 官方博客

    vLLM 与 DeepSpeed-FastGen 性能对比分析

    vLLM 在常见场景中速度与 DeepSpeed-FastGen 相当,处理较长输出时更快,其他场景最高可快 1.8x。DeepSpeed-FastGen 仅在长提示词、短输出负载中凭 Dynamic SplitFuse 占优,但实测增益未达其宣称的 2x。

    on system performance; as well as new features like LoRA, Speculative Decoding, and better Quantization Support. Additionally, we are collaborating with hardware vendors like AMD, AWS Inferenetia, and Intel Habana to bring LLM to the broadest community. Appendix: Feature Comparison DeepSpeed-FastGen currently offers basic functionalities, supporting only three model types and lacking popular features like stop strings and parallel sampling (e.g., beam search). We do expect the DeepSpeed-FastGen

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星期五

  1. Lilian Weng:Lil'Log

    LLM 驱动的自主智能体:规划、记忆与工具调用综述

    Lilian Weng 在 Lil'Log 撰文梳理以 LLM 为核心控制器的自主智能体架构,将其拆解为规划、记忆和工具调用三大组件。规划部分涵盖 CoT、Tree of Thoughts、LLM+P 等任务分解方法,以及 ReAct、Reflexion、Chain of Hindsight、Algorithm Distillation 等自我反思机制。记忆部分区分短期上下文学习与基于外部向量库的长期记忆,并介绍 LSH、ANNOY、HNSW、FAISS、ScaNN 等快速 MIPS 检索算法;工具调用部分则列举 MRKL、TALM、Toolformer、HuggingGPT、API-Bank 以及 ChemCrow 等科学发现智能体案例。文末指出有限上下文长度、长期规划与任务分解、自然语言接口可靠性三类常见局限。

    . This indicates a potential problem with using LLM to evaluate its own performance on domains that requires deep expertise. The lack of expertise may cause LLMs not knowing its flaws and thus cannot well judge the correctness of task results. Boiko et al. (2023) also looked into LLM-empowered agents for scientific discovery, to handle autonomous design, planning, and performance of complex scientific experiments. This agent can use tools to browse the Internet, read documentation, execute code,

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星期二

  1. a16z:News

    a16z 创始人 Marc Andreessen 长文:AI 将拯救世界

    a16z 联合创始人 Marc Andreessen 发表长文《Why AI Will Save the World》,主张 AI 不会毁灭人类、不会摧毁社会、不会造成大规模失业,反而会带来生产力与经济繁荣。他把 AI 风险恐慌类比为历史上的技术道德恐慌,用 Baptists 与 Bootleggers 框架批评监管推动者,并称唯一真实风险是中国取得全球 AI 主导地位,主张美国全力加速 AI 发展、放开开源与创业竞争。

    w era of heightened material prosperity across the planet; Scientific breakthroughs and new technologies and medicines will dramatically expand, as AI helps us further decode the laws of nature and harvest them for our benefit; The creative arts will enter a golden age, as AI-augmented artists, musicians, writers, and filmmakers gain the ability to realize their visions far faster and at greater scale than ever before; I even think AI is going to improve warfare, when it has to happen, by reduci

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星期四

  1. a16z:News

    a16z 发布 AI Canon:现代 AI 必读资源精选清单

    a16z 发布“AI Canon”精选资源清单,汇集过去几年对 AI 领域影响最大的论文、博客、课程与指南。清单从 Transformer 与潜在扩散模型入门讲起,延伸到 LLM 技术学习、实践指南与 AI 市场分析,并收录以 2017 年 Google 论文《Attention is All You Need》为起点的里程碑研究。

    paper (see below), this post gets to the heart of the big question in LLM scaling: are we running out of data? This builds on the post above and gives a refreshed view on scaling laws; A survey of large language models: Comprehensive breakdown of current LLMs, including development timeline, size, training strategies, training data, hardware, and more; Sparks of artificial general intelligence: Early experiments with GPT-4: Early analysis from Microsoft Research on the capabilities of GPT-4, the

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星期日

  1. Lilian Weng:Lil'Log

    Lilian Weng 详解主动学习:预算受限下如何挑选最有价值的标注样本

    Lilian Weng 在 Lil'Log 发文介绍主动学习:给定无标注数据集和固定标注预算 B,主动学习要从中挑出 B 个样本送标,以最大化模型性能提升,适合医学图像等标注昂贵场景。文章梳理了不确定性采样(least confident、margin、entropy)、Query-By-Committee、多样性采样、期望模型变化与混合策略,并把模型不确定性分为数据噪声导致的 aleatoric 与参数层面的 epistemic 两类。

    ual settings of the parameters are confident (low $H(y \vert \mathbf{x}, \boldsymbol{\theta})$).” In other words, each individual posterior draw is confident but a collection of draws carry diverse opinions. BALD was originally proposed for an individual sample and Kirsch et al. (2019) extended it to work in batch mode. Forgetting Events To investigate whether neural networks have a tendency to forget previously learned information, Mariya Toneva et al. (2019) designed an experiment: They track

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星期日

  1. Lilian Weng:Lil'Log

    深度强化学习中的探索策略

    Lilian Weng 在 Lil'Log 梳理了深度强化学习中的常见探索策略,包括 epsilon-greedy、UCB、Boltzmann 探索、Thompson 采样,以及熵损失项和基于噪声的探索。文章重点讨论 hard-exploration 与 Noisy-TV 两个难题,并介绍以内在奖励加成鼓励探索的思路,如基于计数的探索方法。

    $ up to time $t$ and $\hat{U} t(a)$ is a function reversely proportional to how many times action $a$ has been taken. See here for more details; Boltzmann exploration: The agent draws actions from a boltzmann distribution (softmax) over the learned Q values, regulated by a temperature parameter $\tau$; Thompson sampling: The agent keeps track of a belief over the probability of optimal actions and samples from this distribution. See here for more details The following strategies could be used fo

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星期五

  1. Sam Altman Blog

    Sam Altman:人类与 AI 的融合已经开始

    Sam Altman 认为,人类与 AI 的融合并非单一时刻,而是已经开始的渐进过程,手机、社交媒体和搜索算法正持续影响人类。随着算力和 AI 研究人才快速增长,超级人类 AI、基因增强与脑机接口或将到来,全球应尽早协调应对。

    wer and run the AI on it, and it figures out how to build even better chips. This probably cannot be stopped. As we have learned, scientific advancement eventually happens if the laws of physics do not prevent it. More important than that, unless we destroy ourselves first, superhuman AI is going to happen, genetic enhancement is going to happen, and brain-machine interfaces are going to happen. It is a failure of human imagination and human arrogance to assume that we will never build things sm

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星期二

  1. Lilian Weng:Lil'Log

    如何解释机器学习模型的预测?| Lil'Log

    Lilian Weng 在 Lil'Log 撰文梳理机器学习模型的可解释性方法,从线性回归、朴素贝叶斯、决策列表到随机森林等本身可解释的模型入手。文章引用 Lipton (2017) 提出的可模拟性、算法透明性与可分解性三项标准,并以金融放贷、医疗诊断、司法再犯预测和自动驾驶等场景说明解释模型决策的必要性。

    the corresponding interpretable data representation $x b$, let us sample instances around $x b$ by drawing nonzero elements of $x b$ uniformly at random where the number of such draws is also uniformly sampled. This process generates a perturbed sample $z b$ which contains a fraction of nonzero elements of $x b$. Then we recover $z b$ back into the original input $z$ and get a prediction score $f(z)$ by the target model. Use many such sampled data points $z b \in \mathcal{Z} b$ and their model p

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