Keeping ad content policy classifiers up to date while maintaining the high quality bar is a significant challenge, especially with new threats emerging constantly. This paper introduces a new application to apply RAG-inspired in-context learning to accelerate content policy enforcement, especially when mitigating new emerging violations. Our application leverages RAG-based LLM inference for classification tasks and incorporates augmented reasoning information for better performance. We also developed a practical framework to enforce new violation patterns in O(1) days demonstrating improved memorization and generalization capabilities compared to traditional parametric and non-parametric models.

Large language models (LLMs) are powerful tools for content moderation, but their inference costs and latency make them prohibitive for casual use on large datasets, such as the Google Ads repository. This study proposes a method for scaling up LLM reviews for content moderation in Google Ads. First, we use heuristics to select candidates via filtering and duplicate removal, and create clusters of ads for which we select one representative ad per cluster. We then use LLMs to review only the representative ads. Finally, we propagate the LLM decisions for the representative ads back to their clusters. This method reduces the number of reviews by more than 3 orders of magnitude while achieving a 2x recall compared to a baseline non-LLM model. The success of this approach is a strong function of the representations used in clustering and label propagation; we found that cross-modal similarity representations yield better results than uni-modal representations.