Instruction Tuning: Teaching Models to Follow Orders
Instruction tuning teaches a language model to generalize by finetuning it on a massive collection of tasks described in plain English. This transforms a raw pretrained model, which just predicts the next word, into one that can follow commands on unseen tasks without any examples (zero-shot). The footgun is mistaking this for simple finetuning on one task; its power comes from the sheer diversity of instructional tasks used during training.
### The mental model
A pretrained language model is like a brilliant person who has read the entire internet but doesn't know how to answer a direct question. It's an expert at predicting the next word in a sequence, but not at following commands. Instruction tuning is the process of teaching it how to be a helpful assistant by showing it thousands of examples of instructions and their desired outputs. The model doesn't just memorize answers; it learns the general pattern of mapping a command to a correct response.
### How it works
You start with a large, pretrained model. Then, you gather dozens of different NLP datasets for tasks like translation, summarization, and question answering. For each example, you create a natural language instruction, like "Translate this English sentence to French: ..." or "Summarize the following article:". You then finetune the base model on this massive, mixed collection of instruction-formatted data. The model learns to recognize and execute tasks based on the instructions provided, rather than just continuing a text pattern.
### When to use it
* To significantly improve the zero-shot and few-shot capabilities of a base model. * To create a general-purpose "assistant" or "chatbot" from a raw, pretrained model. * When you need a model to perform well on a wide variety of unseen tasks without needing specific examples at inference time.
### When NOT to use it
* If you need maximum performance on a single, narrow task. Standard finetuning on just that task's data is often more direct and effective. * If you lack a large and diverse collection of instruction-formatted datasets. The method's success is highly dependent on the scale and variety of the tuning data.
### One canonical example
The paper "Finetuned Language Models Are Zero-Shot Learners" introduced FLAN (Finetuned Language Net). The authors took a 137B parameter model and instruction-tuned it on over 60 NLP tasks. The resulting model, FLAN, surpassed the zero-shot performance of the larger 175B GPT-3 on 20 out of 25 evaluated tasks, proving that instruction tuning is a highly effective method for unlocking a model's latent abilities to follow instructions.
Read the original → arxiv.org
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