Really impressive writeup. In your opinion, how long will this stay up to date? The field is constantly evolving, do you plan to keep updating this document?
Thanks! I expect the book will remain relevant as long as the Transformers architecture does. That’s why we mostly focus on topics we think will stand the test of time, but let’s see how that plays out :)
I'm a little ways through this and it's great so far, nice job.
One of the reasons people build one though is to learn. Most smart folks are quite aware that the reality of pre-training a real LLM is going to involve some head banging against the wall (ie, things don't go smoothly like "building an llm from scratch" book), and they want to go through the process.
Hugging Face is not just an AI information-sharing website; it’s also a great learning platform for all AI learners. This documentation is one of the most impressive hands-on resources I’ve ever read.
Been reading a book by u/fpham "The Cranky mans guide to lora and qlora" and it's pretty great, writing quality isnt all there but the content is valuable for learning to make good finetunes
> Change only one variable per ablation while keeping everything else constant. If you change multiple things and performance improves, you won’t know what caused it. Test modifications individually, then combine successful ones and reassess.
This is an unintentional microcosm of what is flawed with the document.
It’s advice for being an individual contributor, not a researcher.
And even then. If you’re an IC and your boss is saying, “incrementalism at the level of planning experiments,” and the goal is research, quit, because you will fail.
One problem with testing one change at a time is that if you can only run a small number of experiments because each one requires many GPU hours to get results, you can also only test a small number of changes. If you can come up with and implement new changes much more easily than you can test them, it would be more efficient to test multiple changes at a time and use some form of Bayesian optimization to find the best combination of changes with as few experiments as possible.
Agreed. One at a time testing (OAT) has been outdated for almost a century at this point. Factorial and fractional factorial experiments have been around for that long and give detailed insights into the effect of not just single changes but the interaction between changes, which means you can superpower your learnings as many variables in DL do in fact interact.
Or, more modern Bayesian methods if you're more interested in getting the best results for a given hyperparameter sweep.
However, that is not to detract from the excellent effort made here and the great science being investigated. Write ups like this offer so much gold to the community.
The number of runs you can afford are not enough to perform Bayesian optimization. Count how many different options they explored in the text and take a guess how many samples you need to start modeling the hyperparameter space.
One of the reasons people build one though is to learn. Most smart folks are quite aware that the reality of pre-training a real LLM is going to involve some head banging against the wall (ie, things don't go smoothly like "building an llm from scratch" book), and they want to go through the process.
Tumbler speak has a bunch of whacky things, notably "chimkin nuggers."
> Modify one thing at a time
> Change only one variable per ablation while keeping everything else constant. If you change multiple things and performance improves, you won’t know what caused it. Test modifications individually, then combine successful ones and reassess.
This is an unintentional microcosm of what is flawed with the document.
And even then. If you’re an IC and your boss is saying, “incrementalism at the level of planning experiments,” and the goal is research, quit, because you will fail.
Or, more modern Bayesian methods if you're more interested in getting the best results for a given hyperparameter sweep.
However, that is not to detract from the excellent effort made here and the great science being investigated. Write ups like this offer so much gold to the community.