https://huggingface.co/kalomaze/MiniSymposium-Demo
MiniSymposium is an experimental model that I created based on Mistral 7b. I created it attempting to test these goals:
- Demonstrate the untapped potential of using a small, focused dataset of handwritten examples instead of training on a large amount of synthetic GPT outputs, by lowering the learning rate and doing many passes over the small dataset
- Create a dataset that allows the model to explore different possible answers from multiple perspectives before reaching a final conclusion ('Socratic prompting'?)
- Develop a model that performs well across various pseudo-markdown prompt formats, rather than overfitting to a specific kind of format such as ChatML, which should naturally benefit other general purpose use cases
The current trend in QLora/Lora-based finetuning (and finetuning in general for local LLMs) is to use large synthetic datasets. These are typically GPT-generated datasets trained with higher learning rates.
However, I believe there is a lot of potential in using small, hand-written datasets with low learning rates, even if it's for general-purpose instruction following, as long as you train it for many epochs on a learning rate low enough to avoid overfitting.
This approach, I hypothesize, helps the model to learn the deeper patterns of instruction following , including the small details. This should help to avoid shallow data biases (like "As an AI made by OpenAI" and other GPT-isms) that are irrelevant to deeper instruction following patterns, especially in long context and multiturn scenarios.
My initial configuration for this QLora model used a constant learning rate of 1e-6 (0.000001), which resulted in obvious, massive overfitting after about 100 epochs. The model started reproducing the original dataset almost verbatim, and exhibited poor generalization across different prompt formats, including obvious hallucinations & also Chinese language outputs for some reason.
However, turning down the learning rate to 1/10th of (1e-7, which is 0.0000001) significantly improved the model with the same exact small dataset. I trained for about ~10 hours on my RTX 3060 to 600 epochs; I think it's still a little undertrained, but I encourage people to try the demo model out in the meantime.
It's designed to be very adaptable to different prompt formats and playing roles, and I've gotten some fun and sometimes surprisingly good outputs so far.
A few samples of the training data are formatted like this to help avoid blatant overconfidence in its outputs, to serve as a sort of self-correction mechanism:
Let me know how this model goes. There's lots of merges of models that are all sort of doing the same thing, so I figured a more experimental approach would be appreciated. I think there is still more optimization for LR/epoch balance, and I'll probably add some more examples of specific tasks like Summarization in the dataset so that it's not *too* small (but still lightweight enough to generalize well).
Honestly, no idea. I have more theoretical than practical understanding. But my idea of the warmup phase is to arrange the initial totally random weights of a network into something where you can optimize on. When finetuning you don't start from randomness, you start from a trained checkpoint, so I expect that the warmup phase is pointless (at least for SGD, no idea if it helps adaptive optimizers). So believe you should go from high learning rate to low learning rate, unless somebody knows better.
Oh, and when training Loras, remember that changing alpha also changes the learning rate by the same factor if I remember right. So many tests about optimal alpha are probably invalid, because people didn't adjust the learning rate.