arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.07652cs.LGcs.AIstat.ML
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边缘预测:确定更大模型的优势

Predicting on the Edge: Identifying Where a Larger Model Does Better

Google Research(谷歌研究院)

Taman Narayan, Heinrich Jiang, Sen Zhao, Sanjiv Kumar

摘要:

人们已经投入了大量的精力来制作更大和更精确的模型,但相对而言,很少有人去理解哪些例子会从增加的复杂性中受益。在本文中,我们展示并分析了模型对单个示例的预测不确定性与较大模型将改善预测的可能性之间令人惊讶的紧密联系。通过对T5编码器-解码器架构的广泛数值研究,我们表明,大模型对小模型最不确定的例子有最大的改进。在更确定的例子中,即使是那些小模型不是特别准确的例子,大模型通常根本无法改进,甚至比小模型表现得更差。基于这些研究结果,我们表明,一个切换器模型,推迟一个更大的模型的例子时,一个小的模型是不确定的,可以实现显着的改善性能和资源使用。我们还探讨了基于委员会的不确定性度量,可以更有效,但不太实用。

英文摘要:

Much effort has been devoted to making large and more accurate models, but relatively little has been put into understanding which examples are benefiting from the added complexity. In this paper, we demonstrate and analyze the surprisingly tight link between a model's predictive uncertainty on individual examples and the likelihood that larger models will improve prediction on them. Through extensive numerical studies on the T5 encoder-decoder architecture, we show that large models have the largest improvement on examples where the small model is most uncertain. On more certain examples, even those where the small model is not particularly accurate, large models are often unable to improve at all, and can even perform worse than the smaller model. Based on these findings, we show that a switcher model which defers examples to a larger model when a small model is uncertain can achieve striking improvements in performance and resource usage. We also explore committee-based uncertainty metrics that can be more effective but less practical.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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