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cs.LG updates on arXiv.org

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Improving Large-Scale Recommender Systems with Auxiliary Learning
Mertcan Cokb · 2026-04-23 · via cs.LG updates on arXiv.org

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Abstract:Training large-scale recommendation models under a single global objective implicitly assumes homogeneity across user populations. However, real-world data are composites of heterogeneous cohorts with distinct conditional distributions. As models increase in scale and complexity and as more data is used for training, they become dominated by central distribution patterns, neglecting head and tail regions. This imbalance limits the model's learning ability and can result in inactive attention weights or dead neurons. In this paper, we reveal how the attention mechanism can play a key role in factorization machines for shared embedding selection, and propose to address this challenge by analyzing the substructures in the dataset and exposing those with strong distributional contrast through auxiliary learning. Unlike previous research, which heuristically applies weighted labels or multi-task heads to mitigate such biases, we leverage partially conflicting auxiliary labels to regularize the shared representation. This approach customizes the learning process of attention layers to preserve mutual information with minority cohorts while improving global performance. We evaluated proposed method on massive production datasets with billions of data points each for six SOTA models. Experiments show that the factorization machine is able to capture fine-grained user-ad interactions using the proposed method, achieving up to a 0.16% reduction in normalized entropy overall and delivering gains exceeding 0.30% on targeted minority cohorts.
Subjects: Machine Learning (cs.LG)
Cite as: arXiv:2510.02215 [cs.LG]
  (or arXiv:2510.02215v3 [cs.LG] for this version)
  https://doi.org/10.48550/arXiv.2510.02215

arXiv-issued DOI via DataCite

Submission history

From: Mertcan Cokbas [view email]
[v1] Thu, 2 Oct 2025 17:00:17 UTC (1,584 KB)
[v2] Fri, 3 Oct 2025 15:45:09 UTC (1,584 KB)
[v3] Tue, 21 Apr 2026 19:25:21 UTC (1,584 KB)

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