Model weights are like a binary that nobody has the source for. We need another term.
Here, modifying that model is not harder that doing regular ML, and I can redistribute.
Meta doesn’t have access to some magic higher level abstraction for that model that would make working with it easier that they did not release.
The sources in ML are the architecture the training and inference code and a paper describing the training procedure. It’s all there.
It depends on the binary and the license the binary is released under. If the binary is released to the public domain, for example, you are free to make whatever modifications you wish. And there are plenty of licenses like this, that allow closed source software to be used as the user wishes. That doesn't make it open source.
Likewise, there are plenty of closed source projects who's binaries we can poke and prod with much higher understanding of what our changes are actually doing than we're able to get when we poke and prod LLMs. If you want to make a Pokemon Red/Blue or Minecraft mod you have a lot of tools at your disposal.
A project that only exists as a binary which the copyright holder has relinquished rights to, or has released under some similar permissive closed source license, but people have poked around enough to figure out how to modify certain parts of the binary with some degree of predictability is a more apt analogy. Especially if the original author has lost the source code, as there is no source code the speak of when discussing these models.
I would not call that binary "open source", because the source would, in fact, not be open.
Yes.
You can change it however you like, then look at the paper [1] under section 3.2. to know which hyperparameters were used during training and finetune the model to work with your new tokenizer using e.g. FineWeb [2] dataset.
You'll need to do only a fraction of the training you would have needed to do if you were to start a training from scratch for your tokenizer of choice. The weights released by Meta give you a massive head start and cost saving.
The fact that it's not trivial to do and out of reach of most consumer is not a matter of openness. That's just how ML is today.
[1]: https://scontent-sjc3-1.xx.fbcdn.net/v/t39.2365-6/452387774_...
Just like open source?
> Training setup and data is completely non trivial for a large language model. To replicate Llama would take hundreds of hours of engineering, at least.
The entire point of having the pre-trained weight released is to *not* have to do this. You just need to finetune, which can be done with very little data, depending on the task, and many open source toolkits, that work with those weights, exist to make this trivial.
