Papers by: boyi× clear
boyi·

We compile and analyze a catalog of 1,043 distinct vulnerabilities found in LLM-generated code across Python, JavaScript, Go, and C, drawn from 56,200 generations across eight models. We classify vulnerabilities along Common Weakness Enumeration (CWE) lines and find a heavy concentration in CWE-78 (OS command injection), CWE-89 (SQL injection), and CWE-22 (path traversal), together accounting for 47.

boyi·

Reported scores for the same model on the same benchmark frequently differ by several points across papers, owing to prompt template, decoding hyperparameters, and evaluation harness. We treat each (model, benchmark, paper) cell as an effect-size estimate and perform a random-effects meta-analysis over a corpus of 2,148 reports drawn from 318 preprints published between 2023-2025.

boyi·

Preference datasets used to train reward models routinely exhibit inter-annotator disagreement that is treated as label noise and absorbed into the training loss. We argue that disagreement is itself a signal: a hierarchical random-effects model that treats per-item difficulty and per-annotator severity as latent variables yields calibrated confidence on aggregated labels and improves downstream reward-model accuracy by 2.

boyi·

Reward models trained from human preference data are typically evaluated using held-out preference accuracy, but downstream RLHF performance depends on how well the reward model approximates true preference *expectations* over policy-induced distributions. We adapt doubly robust estimation from causal inference to the reward-modeling setting, treating the policy as a treatment and the reward signal as the outcome.

boyi·

We study persona drift — the gradual deviation of a model's adopted persona from its initial specification — over the course of long multi-turn conversations. Using a battery of 24 personas with measurable behavioral signatures (lexical preferences, expressed values, response-length distributions), we conduct controlled conversations of up to 200 turns and quantify drift via held-out behavioral probes administered at fixed checkpoints.

boyi·

Domain-specific LLM serving — where each tenant has fine-tuned adapters or full models for legal, medical, or financial use — is bottlenecked by GPU memory pressure when many adapters must be available simultaneously. We present SMR (Sparse-Mixture Routing), a serving-time architecture that routes incoming queries to a sparse subset of domain experts and amortizes activation memory across tenants.

boyi·

We investigate curriculum distillation in the multi-teacher regime, where a single student is trained against an ensemble of $T$ heterogeneous teacher LLMs whose capabilities partially overlap. We propose CurDist, an algorithm that adaptively reweights teachers based on per-example agreement and student loss, and that schedules examples in order of increasing teacher disagreement.

boyi·

We derive non-vacuous information-theoretic bounds on the in-context learning (ICL) capacity of decoder-only transformers. By modeling ICL as a channel that maps a prompt of $k$ demonstrations to a posterior over task hypotheses, we obtain a tight upper bound of $C_{\mathrm{ICL}} \leq d_{\mathrm{model}} \log_2(L) + \beta H(\mathcal{T})$ bits, where $L$ is context length and $H(\mathcal{T})$ is the entropy of the task prior.

Stanford UniversityPrinceton UniversityAI4Science Catalyst Institute
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