LLM-Blender: Ensembling Large Language Models with Pairwise Ranking and
  Generative Fusion
We present LLM-Blender, an ensembling framework designed to attain
consistently superior performance by leveraging the diverse strengths of
multiple open-source large language models (LLMs). Our framework consists of
two modules: PairRanker and GenFuser, addressing the observation that optimal
LLMs for different examples can significantly vary. PairRanker employs a
specialized pairwise comparison method to distinguish subtle differences
between candidate outputs. It jointly encodes the input text and a pair of
candidates, using cross-attention encoders to determine the superior one. Our
results demonstrate that PairRanker exhibits the highest correlation with
ChatGPT-based ranking. Then, GenFuser aims to merge the top-ranked candidates,
generating an improved output by capitalizing on their strengths and mitigating
their weaknesses. To facilitate large-scale evaluation, we introduce a
benchmark dataset, MixInstruct, which is a mixture of multiple instruction
datasets featuring oracle pairwise comparisons. Our LLM-Blender significantly
outperform individual LLMs and baseline methods across various metrics,
establishing a substantial performance gap.
647e8610e4d52fe0e02108bf
Dongfu Jiang
admin_assigned
2023-06-06T10:03:21.541Z
62567c86d444a9b5a0ec51c1
https://cdn-avatars.huggingface.co/v1/production/uploads/62567c86d444a9b5a0ec51c1/1vXJf2uGztPcXpkwyTBr6.png
Dongfu Jiang
user
DongfuJiang
647e8610e4d52fe0e02108c0
Xiang Ren
647e8610e4d52fe0e02108c1
Bill Yuchen Lin
claimed_verified
2023-06-06T08:40:05.051Z
607f666a4ad99100d63ce35c
https://cdn-avatars.huggingface.co/v1/production/uploads/607f666a4ad99100d63ce35c/QxhxnvfeV6efkxwUFHwjI.png
Bill Yuchen Lin
user
yuchenlin
LLM-Blender: Ensembling Large Language Models with Pairwise Ranking and
  Generative Fusion
We present LLM-Blender, an ensembling framework designed to attain
consistently superior performance by leveraging the diverse strengths of
multiple open-source large language models (LLMs). Our framework consists of
two modules: PairRanker and GenFuser, addressing the observation that optimal
LLMs for different examples can significantly vary. PairRanker employs a
specialized pairwise comparison method to distinguish subtle differences
between candidate outputs. It jointly encodes the input text and a pair of
candidates, using cross-attention encoders to determine the superior one. Our
results demonstrate that PairRanker exhibits the highest correlation with
ChatGPT-based ranking. Then, GenFuser aims to merge the top-ranked candidates,
generating an improved output by capitalizing on their strengths and mitigating
their weaknesses. To facilitate large-scale evaluation, we introduce a
benchmark dataset, MixInstruct, which is a mixture of multiple instruction
datasets featuring oracle pairwise comparisons. Our LLM-Blender significantly
outperform individual LLMs and baseline methods across various metrics,
establishing a substantial performance gap.
An ensembling framework combines multiple large language models by ranking and merging outputs to achieve superior performance across various metrics.
LLM-Blender PairRanker GenFuser cross-attention encoders MixInstruct large language models