Ensemble-Instruct: Generating Instruction-Tuning Data with a
  Heterogeneous Mixture of LMs
Authors: name: Young-Suk Lee, name: Md Arafat Sultan, name: Yousef El-Kurdi, name: Tahira Naseem Asim Munawar, name: Radu Florian, name: Salim Roukos, name: Ramón Fernandez Astudillo

Using in-context learning (ICL) for data generation, techniques such as
Self-Instruct (Wang et al., 2023) or the follow-up Alpaca (Taori et al., 2023)
can train strong conversational agents with only a small amount of human
supervision. One limitation of these approaches is that they resort to very
large language models (around 175B parameters) that are also proprietary and
non-public. Here we explore the application of such techniques to language
models that are much smaller (around 10B--40B parameters) and have permissive
licenses. We find the Self-Instruct approach to be less effective at these
sizes and propose new ICL methods that draw on two main ideas: (a)
Categorization and simplification of the ICL templates to make prompt learning
easier for the LM, and (b) Ensembling over multiple LM outputs to help select
high-quality synthetic examples. Our algorithm leverages the 175 Self-Instruct
seed tasks and employs separate pipelines for instructions that require an
input and instructions that do not. Empirical investigations with different LMs
show that: (1) Our proposed method yields higher-quality instruction tuning
data than Self-Instruct, (2) It improves performances of both vanilla and
instruction-tuned LMs by significant margins, and (3) Smaller instruction-tuned
LMs generate more useful outputs than their larger un-tuned counterparts. Our
codebase is available at https://github.com/IBM/ensemble-instruct.