The instruction learning paradigm---where a model learns to perform new tasks from task descriptions alone---has become popular in research on general-purpose models. The capabilities of large transformer models as instruction learners, however, remain poorly understood. We use a controlled synthetic environment to characterize such capabilities. Specifically, we use the task of deciding whether a given string matches a regular expression (viewed as an instruction) to identify properties of tasks, instructions, and instances that make instruction learning challenging. For instance, we find that our model, a fine-tuned T5-based text2text transformer, struggles with large regular languages, suggesting that less precise instructions are challenging for models. Instruction executions that require tracking longer contexts of prior steps are also difficult. We use our findings to systematically construct a challenging instruction learning dataset, which we call Hard RegSet. Fine-tuning on Hard RegSet, our large transformer learns to correctly interpret (with at least 90\% accuracy) only 65.6\% of test instructions, and 11\%-24\% of the instructions in out-of-distribution generalization settings. We thus propose Hard RegSet as a challenging instruction learning dataset, and a controlled environment for studying instruction learning.

What Makes Instruction Learning Hard? An Investigation and a New Challenge in a Synthetic Environment

**Chairs:**  Xiaodan Zhu and Amar Prakash Azad

O8 Language Modeling and Analysis of Lanaguge Models

technical paper

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