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Reasoning from scratch, round number 5! This time, talking about log-probability scoring (also a great fundamental concept for loss functions like cross-entropy in pre-training and distillation) and self-refinement. 00:00 Introduction and inference-time scaling recap 05:02 Loading the pretrained LLM 08:00 Comparing and scoring model answers 10:18 Building a rule-based...

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Sebastian Raschka

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59,636 Aufrufe • vor 1 Monat •via X (Twitter)

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27 Kommentare

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

And a link to the video on YouTube:

Profilbild von Parul Pandey
Parul Pandeyvor 1 Monat

Reading this chapter from your book as I type. Its a joy to read it. Also the visuals make it really easy to grasp the topic.

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

Thanks a lot! Put lots of work went into it, and it really feels good to hear this :)

Profilbild von Giacomo Masseroni
Giacomo Masseronivor 1 Monat

log probs for numerical stability instead of raw probabilities, that part alone saves people from nan hell

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

Yup. Also covered that explicitly there :)

Profilbild von Victor Akinode
Victor Akinodevor 1 Monat

The timestamps make this much easier to learn from, Sebastian. For anyone following along, changing one scoring choice and comparing the answers could be a lovely little experiment. It gives those probability calculations something concrete to connect to.

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

Thanks!

Profilbild von Fireply.ai
Fireply.aivor 1 Monat

timestamps going past an hour and it's still just round 5, this book is going to be dense

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

some would say "you get your money's worth" :P

Profilbild von lewington
lewingtonvor 1 Monat

log probabilities are quite useful to understand cuz getting a model to generate an answer and figuring out if its answer is actually better are two very different things.

Profilbild von Daniel Priscu
Daniel Priscuvor 1 Monat

log-prob scoring pairs well with self-refinement, since the model can rank its own revisions instead of guessing which one improved

Profilbild von The Lunar Misfit
The Lunar Misfitvor 1 Monat

Self-refinement is a much kinder name than 'read that back to yourself'.

Profilbild von David Arnal
David Arnalvor 1 Monat

The average log-probability scoring setup is a nice detail; it also makes the numerical-stability discussion feel directly relevant rather than incidental.

Profilbild von Siddharth Jain
Siddharth Jainvor 1 Monat

Computing token probabilities in PyTorch was my fav part, very well explained.

Profilbild von Bk1man｜AI 开源雷达
Bk1man｜AI 开源雷达vor 1 Monat

想快速验证自精炼到底贡献了多少，可以先做一个 20 分钟测试：① 准备 50 道有标准答案的题先跑一遍，记下基线准确率 ② 打开自精炼再跑一遍，统计修正率和误修率 ③ 把自精炼关掉、只保留 logprob 阈值过滤跑第三遍，看阈值这一步单独贡献了多少。这样就知道收益是来自精炼本身，还是来自筛掉低置信样本。

Profilbild von Jatin Garg
Jatin Gargvor 1 Monat

Log-probability scoring makes sense for evaluating model confidence, but how do you handle cases where the model is confidently wrong? High log-prob on an incorrect answer seems like it would still score well.

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

Yes, this is confidence, not correctness.I am talking through that issue in this video. You could technically use a second stronger model though that checks the answer. Kind of like speculative decoding works (the more expensive model accepts/rejects cheaply generated suggestions). But yeah, either way, the other motivation to introduce log-probability scoring is that it is essential for the upcoming training chapters (RL and distillations).

Profilbild von VisiveAI
VisiveAIvor 1 Monat

Log-prob scoring is the boring fundamental that keeps evals honest — glad R5 drills it from scratch. Stack ↓ #LLM #ML

Profilbild von Saksham Jain
Saksham Jainvor 1 Monat

does log-prob self-scoring hold up when the model's miscalibrated? wondered if self-refinement just reinforces the confident wrong ones

Profilbild von Oleks
Oleksvor 1 Monat

saving the log-prob section for tomorrow morning

Profilbild von dhinna ship .ico
dhinna ship .icovor 1 Monat

Token-level or sequence-level log-probs in the self-refinement loop?

Profilbild von abdul samad
abdul samadvor 1 Monat

You have been source of learning for millions, thank you very much for creating these videos

Profilbild von Sebastian Raschka
Sebastian Raschkavor 1 Monat

thank you for the kind words!

Profilbild von VastPlan
VastPlanvor 1 Monat

对数概率评分把候选答案压成可比较的序列似然，也是交叉熵与蒸馏损失的共用底座。把规则打分换成平均对数概率后，自我精炼循环才有稳定的排序依据；若评论器与生成器共用同一套偏差，MATH-500 上的增益仍需与独立裁判对照。

Profilbild von Elliott
Elliottvor 1 Monat

I am going to watch the heck out of this Seb

Profilbild von dish
dishvor 1 Monat

Great point that log-probs measure confidence, not correctness. High confidence on a wrong answer is the dangerous case. How do you calibrate or downweight that in a self-refinement loop?

Profilbild von ethereagle · building
ethereagle · buildingvor 1 Monat

self-refinement only pays if the scorer already agrees with MATH-500. did average logprob ranking move the score on its own, or only after the critique loop?

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Matt Turck

10,849 Aufrufe • vor 2 Monaten

Another quick lecture -- I've been asked many times for prereq's to my book and what you should know, so built a little lecture (with GLM 5.2) to cover some more basics. Topics include: 00:00 Introduction & Course Prerequisites 01:37 Language Models Overview 02:47 The LM Head 04:29 Softmax & Log-Probabilities 06:13 Anatomy of an LM Training Example 06:37 Computing LLM Probabilities (+Phoebe the Dog) 09:52 Three Common Masks in Post-Training 11:03 A Small Decoding Review 12:14 Training an LM: Cross-Entropy 13:23 Optimization & Fine-Tuning 13:55 Pretraining to Midtraining to SFT Pipeline 15:25 Probability Essentials: KL Divergence & Entropy 19:36 Sigmoid & Pairwise Likelihood 20:29 Reinforcement Learning Framing (MDP) 22:28 Transitioning Tools into Post-Training 23:12 Recommended Resources & Wrap-Up  Happy learning and I'm still taking questions from during the course for Q&A videos.
23:52

Another quick lecture -- I've been asked many times for prereq's to my book and what you should know, so built a little lecture (with GLM 5.2) to cover some more basics. Topics include: 00:00 Introduction & Course Prerequisites 01:37 Language Models Overview 02:47 The LM Head 04:29 Softmax & Log-Probabilities 06:13 Anatomy of an LM Training Example 06:37 Computing LLM Probabilities (+Phoebe the Dog) 09:52 Three Common Masks in Post-Training 11:03 A Small Decoding Review 12:14 Training an LM: Cross-Entropy 13:23 Optimization & Fine-Tuning 13:55 Pretraining to Midtraining to SFT Pipeline 15:25 Probability Essentials: KL Divergence & Entropy 19:36 Sigmoid & Pairwise Likelihood 20:29 Reinforcement Learning Framing (MDP) 22:28 Transitioning Tools into Post-Training 23:12 Recommended Resources & Wrap-Up  Happy learning and I'm still taking questions from during the course for Q&A videos.

Nathan Lambert

52,668 Aufrufe • vor 4 Monaten

I had an awesome time interviewing idan shenfeld and Jonas Hübotter from MIT and ETH Zurich about self-distillation. this very promising post-training paradigm where the model acts as its own teacher by conditioning on environment feedback or demonstrations. we cover the SDPO algo for reinforcement learning with rich feedback and SDFT for continual learning without forgetting along with many applications. we dig into how it works, why it's simpler and faster than GRPO, and where this is already showing up in production systems. table of content: 0:00 - what is self distillation 2:50 - idan (MIT) and jonas (ETH Zurich) introduction and motivation 18:40 - different perspective of on-policy self-distillation (presentation) 36:00 - metacognition and specificity in self-distillation 37:24 - very long hard task and self-distillation 42:00 - continual learning with self-distillation (presentation) 1:16:50 - what is next in this research direction? 1:20:00 - is there any experience with subjective feedbacks? 1:22:50 - quality vs number of feedbacks? 1:26:40 - what setting would self-distillation struggle vs GRPO? the slides were super crisp really cool of them to share! enjoy my guys 🌹
1:31:19

I had an awesome time interviewing idan shenfeld and Jonas Hübotter from MIT and ETH Zurich about self-distillation. this very promising post-training paradigm where the model acts as its own teacher by conditioning on environment feedback or demonstrations. we cover the SDPO algo for reinforcement learning with rich feedback and SDFT for continual learning without forgetting along with many applications. we dig into how it works, why it's simpler and faster than GRPO, and where this is already showing up in production systems. table of content: 0:00 - what is self distillation 2:50 - idan (MIT) and jonas (ETH Zurich) introduction and motivation 18:40 - different perspective of on-policy self-distillation (presentation) 36:00 - metacognition and specificity in self-distillation 37:24 - very long hard task and self-distillation 42:00 - continual learning with self-distillation (presentation) 1:16:50 - what is next in this research direction? 1:20:00 - is there any experience with subjective feedbacks? 1:22:50 - quality vs number of feedbacks? 1:26:40 - what setting would self-distillation struggle vs GRPO? the slides were super crisp really cool of them to share! enjoy my guys 🌹

Yacine Mahdid

13,119 Aufrufe • vor 6 Monaten

Why isn't the West defending itself? 00:00:00 No Chance of It Being Prime 00:05:24 Sponsor: CrowdHealth 00:07:10 Sponsor: Mars Men 00:11:24 Sponsor: Branch Basics 00:13:57 Kicking Ass and Taking Names with Maps 00:21:24 The UN Adopts Equal Earth 00:26:25 Every Home Should Have a Globe 00:34:03 Is the West at War? 00:37:57 Abortion and Where to Draw the Line 00:46:34 The Lobby and the End of the Republic 00:50:49 Advertising and the Orwell Department 00:53:33 Informed Consent and Fake Blood 01:01:34 Secularism, Utopianism, Liberalism 01:08:39 Is Racism Necessary? 01:13:58 Racism vs. Xenophobia 01:17:51 Colorblind and Not Allowed to Notice 01:23:13 The Danger of the Drifter 01:26:46 Mama Bear Energy and Oxytocin 01:29:27 Cosmopolitan vs. Multicultural 01:35:14 An Honest Discussion About Migration
1:38:20

Why isn't the West defending itself? 00:00:00 No Chance of It Being Prime 00:05:24 Sponsor: CrowdHealth 00:07:10 Sponsor: Mars Men 00:11:24 Sponsor: Branch Basics 00:13:57 Kicking Ass and Taking Names with Maps 00:21:24 The UN Adopts Equal Earth 00:26:25 Every Home Should Have a Globe 00:34:03 Is the West at War? 00:37:57 Abortion and Where to Draw the Line 00:46:34 The Lobby and the End of the Republic 00:50:49 Advertising and the Orwell Department 00:53:33 Informed Consent and Fake Blood 01:01:34 Secularism, Utopianism, Liberalism 01:08:39 Is Racism Necessary? 01:13:58 Racism vs. Xenophobia 01:17:51 Colorblind and Not Allowed to Notice 01:23:13 The Danger of the Drifter 01:26:46 Mama Bear Energy and Oxytocin 01:29:27 Cosmopolitan vs. Multicultural 01:35:14 An Honest Discussion About Migration

Bret Weinstein

30,089 Aufrufe • vor 22 Tagen

The Legitimacy of the American Empire (00:00) The Shifting Definitions of America First (00:24) Realism in American Foreign Policy (02:06) Venezuela: A Case Study (04:13) The American and British Empires (07:05) The Role of Soft Power (14:47) Comparing Modern Empires: Russia and China (17:57) Globalism and the Shadow Empire (23:12) The Legitimacy Crisis of Israel and American Power
26:29

The Legitimacy of the American Empire (00:00) The Shifting Definitions of America First (00:24) Realism in American Foreign Policy (02:06) Venezuela: A Case Study (04:13) The American and British Empires (07:05) The Role of Soft Power (14:47) Comparing Modern Empires: Russia and China (17:57) Globalism and the Shadow Empire (23:12) The Legitimacy Crisis of Israel and American Power

Richard Spencer 🇺🇦

26,926 Aufrufe • vor 1 Jahr

The Legitimacy of the American Empire (00:00) The Shifting Definitions of America First (00:24) Realism in American Foreign Policy (02:06) Venezuela: A Case Study (04:13) The American and British Empires (07:05) The Role of Soft Power (14:47) Comparing Modern Empires: Russia and China (17:57) Globalism and the Shadow Empire (23:12) The Legitimacy Crisis of Israel and American Power
26:29

The Legitimacy of the American Empire (00:00) The Shifting Definitions of America First (00:24) Realism in American Foreign Policy (02:06) Venezuela: A Case Study (04:13) The American and British Empires (07:05) The Role of Soft Power (14:47) Comparing Modern Empires: Russia and China (17:57) Globalism and the Shadow Empire (23:12) The Legitimacy Crisis of Israel and American Power

Richard Spencer 🇺🇦

25,699 Aufrufe • vor 1 Jahr