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In 349,156 infrastructure pull requests, bots were 32.9 percent of the supposedly human ones

AspireAI community · arXiv
A study of 349,156 infrastructure-as-code pull requests across 49,241 GitHub repositories separates human, bot, silent-agent and disclosed-agent contributions, and finds that bots account for 32.9 percent of ostensibly human PRs, with a further 12.3 percent of the remainder carrying agent traces and that share growing over the study period. Agent PRs run about four times larger than human ones and modify core infrastructure modules more often, whereas bots mostly maintain dependencies. Disclosed agents create new infrastructure more often than humans, 34.0 percent against 21.4 percent, yet for the same change type in the same repository their PRs were 8.4 points less likely to be merged, while silent-agent PRs reached higher overall merge rates but were 4.0 points less likely to be merged within the same repositories. On sustainability smells, 2,645 matched agent-human Terraform PR pairs came out level, 10.4 percent against 10.3 percent with a paired odds ratio of 1.02.
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One distance function matched sparse-autoencoder features across layers and compressed feature circuits into supernodes
Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.
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