Memphis-scribe 3B alpha is a finetune of Memphis-CoT 3B on more creative data, which itself is a finetune of StableLM 3B 4e1t.
It is trained further on TinyCoT, but also on
- 10000 comments from reddit-instruct
- 15000 comments from writingprompts-curated
- 4000 examples of converting MathQA problems to Python snippets
- 3000 examples of shorter booksum cases (both chapter->summary and summary->chapter tasks)
- 10000 examples from mathoverflow-accepted comments with >10 upvotes
- 1000 examples from coedit-reworded-deduped
Training procedure
I started from Memphis-CoT 3B, which used a novel iterative contrastive finetuning procedure to improve reasoning ability.
I directly finetuned it on these examples, using a MixCE loss with a mixing ratio of 0.5.
Finetuning on top of finetunes this way tends to lead to catastrophic forgetting - and indeed I observed significant degregation of the resultant model on e.g. GSM8K.
A common strategy to prevent catastrophic foregtting is weight averaging. In the LM community, 'merges' also utilize weight averaging, and spherical linear interpolation (SLERP) is considered to be superior to linear averaging. Accordingly, I used SLERP to average the resultant model back with the original Memphis-CoT model.
This resulted in a model that has learned from the new data, without completely forgetting what it has learned from the original Memphis-CoT training.
Benchmarks
This model performs significantly worse than Memphis-CoT on benchmarks, despite being better suited to chat and creative writing tasks. This is an expected tradeoff.
| Model | GSM8K (5-shot) | AGIEval (English/Nous subset, acc_norm) | BIG Bench Hard (CoT, few-shot*) |
|---|---|---|---|
| StableLM 3B Base | 2.05% | 25.14% | 36.75% |
| Memphis-CoT 3B | 13.8% | 26.24% | 38.24% |
| Memphis-scribe 3B alpha | 12.28% | 23.92% | 38.1% |
| *5-shot, as performed automatically by LM Evaluation Harness bbh_cot_fewshot even with num_fewshot=0 |
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