Text and Code Embeddings by Contrastive Pre-Training

Authors: Arvind Neelakantan, Tao Xu, Raul Puri, Alec Radford, Jesse Michael Han, Jerry Tworek, Qiming Yuan, Nikolas Tezak, Jong Wook Kim, Chris Hallacy, Johannes Heidecke, Pranav Shyam, Boris Power, Tyna Eloundou Nekoul, Girish Sastry, Gretchen Krueger, David Schnurr, Felipe Petroski Such, Kenny Hsu, Madeleine Thompson, Tabarak Khan, Toki Sherbakov, Joanne Jang, Peter Welinder, Lilian Weng

License: CC BY 4.0

Results of the summarizing process for the arXiv paper: 2201.10005v1

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, , , , In recent years, deep unsupervised learning with generative and embedding models has shown significant success. These models have been instrumental in reducing the need for labeled training datasets and have benefited various downstream applications. In this work, we focus on text and code embeddings achieved through contrastive pre-training on unsupervised data at scale. The developed models have demonstrated state-of-the-art results in linear-probe classification, text search, and code search tasks by maximizing the likelihood of observed data and distinguishing it from noise. By utilizing large batch sizes during training, high-quality vector representations of text and code have been obtained. Despite the computational resources required for training these embedding models, there are potential avenues to offset these costs while still allowing users to benefit from their capabilities. One approach is providing safe public access to large pre-trained language models and implementing efficient training pipelines that leverage improved model architectures and training schemes. This research also highlights the importance of addressing issues related to biased representations that could influence resource allocation and opportunities for individuals. It emphasizes the need for further exploration and implementation efforts in these areas to mitigate any potential risks of representational harm. Overall, this study underscores the impact of contrastive pre-training on unsupervised data in generating high-quality text and code embeddings. While achieving remarkable results in various tasks such as linear-probe classification and semantic search, there were observations of underperformance on sentence similarity tasks. The broader societal implications of this work are also discussed, emphasizing the importance of considering ethical considerations when developing AI technologies.
AI-generated keywords: Deep unsupervised learning

AI-generated Key Points

  • Deep unsupervised learning with generative and embedding models has shown significant success
  • Models have reduced the need for labeled training datasets and benefited various downstream applications
  • Text and code embeddings achieved through contrastive pre-training on unsupervised data at scale have demonstrated state-of-the-art results in linear-probe classification, text search, and code search tasks
  • Utilizing large batch sizes during training has led to high-quality vector representations of text and code
  • Potential avenues to offset computational costs include providing safe public access to pre-trained language models and implementing efficient training pipelines
  • Addressing biased representations is crucial to mitigate risks of representational harm
  • Contrastive pre-training on unsupervised data generates high-quality text and code embeddings, though underperformance was observed in sentence similarity tasks
  • Ethical considerations are important when developing AI technologies
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Abstract: Text embeddings are useful features in many applications such as semantic search and computing text similarity. Previous work typically trains models customized for different use cases, varying in dataset choice, training objective and model architecture. In this work, we show that contrastive pre-training on unsupervised data at scale leads to high quality vector representations of text and code. The same unsupervised text embeddings that achieve new state-of-the-art results in linear-probe classification also display impressive semantic search capabilities and sometimes even perform competitively with fine-tuned models. On linear-probe classification accuracy averaging over 7 tasks, our best unsupervised model achieves a relative improvement of 4% and 1.8% over previous best unsupervised and supervised text embedding models respectively. The same text embeddings when evaluated on large-scale semantic search attains a relative improvement of 23.4%, 14.7%, and 10.6% over previous best unsupervised methods on MSMARCO, Natural Questions and TriviaQA benchmarks, respectively. Similarly to text embeddings, we train code embedding models on (text, code) pairs, obtaining a 20.8% relative improvement over prior best work on code search.

Submitted to arXiv on 24 Jan. 2022

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