News will have biases so long as people have opinions. However, as social media becomes the primary entry point for news and partisan gaps increase, it is increasingly important for informed citizens to be able to identify bias. People will be able to take action to avoid polarizing echo chambers if they know how the news they are consuming is biased. In this paper, we explore an often overlooked aspect of bias detection in documents: the semantic structure of news articles. We present DocNet, a novel, inductive, and low-resource document embedding and bias detection model that outperforms large language models. We also demonstrate that the semantic structure of news articles from opposing partisan sides, as represented in document-level graph embeddings, have significant similarities. These results can be used to advance bias detection in low-resource environments. Our code and data are made available at https://github.com/nlpresearchanon.

社交媒体正在成为新闻的主要入口，但由于人们的观点不同，新闻将存在偏见。本文探讨了新闻文章中经常被忽视的偏见检测方面：语义结构。我们提出了一种新颖的归纳式、资源有限的文档嵌入和偏见检测模型（DocNet），其性能超过了大型语言模型。我们还证明了来自相对立政治立场的新闻文章的语义结构（以文档级图形嵌入表示）具有显著的相似性。这些结果可用于提高资源有限环境中的偏见检测。

DocNet: 归纳偏置检测模型中的语义结构