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arxiv: 2605.29357 · v1 · pith:X4UDHKOTnew · submitted 2026-05-28 · 💻 cs.AI · cs.LG· cs.PL

PassNet: Scaling Large Language Models for Graph Compiler Pass Generation

Yiqun Liu , Yingsheng Wu , Ruqi Yang , Enrong Zheng , Honglei Qiu , Sijun He , Tai Liang , Jingjing Wu
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Yuhan Zhou Yiwei Zhang Dongyan Chen Weihan Yi Xinqi Li Siqi Bao
This is my paper

Pith reviewed 2026-06-29 07:50 UTC · model grok-4.3

classification 💻 cs.AI cs.LGcs.PL
keywords compiler optimizationlarge language modelsgraph passestensor compilersPassNetPassBenchfine-tuningperformance optimization
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The pith

Fine-tuning a small LLM on 4K PassNet trajectories yields 2.67x gains that approach frontier-model results on compiler pass generation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that generating structured graph transformation passes is a more suitable use of LLMs in tensor compilers than standalone kernel writing, because passes integrate directly into existing pipelines and can target the 43 percent of subgraphs where default compilation slows down workloads. It supplies PassNet-Dataset with over 18K real-world graphs and PassBench with 200 long-tail fusible tasks scored by the Error-aware Speedup Score that combines correctness, stability, and performance under anti-exploitation defenses. Experiments show frontier models still trail the baseline compiler by 37 percent overall yet deliver up to 3x speedups on individual subgraphs, while fine-tuning a small model on roughly 4K trajectories closes most of that gap. A sympathetic reader would care because this points to a practical route for lifting performance on the long-tail cases that standard compilers leave behind.

Core claim

Pass generation by LLMs is the appropriate abstraction for automated compiler optimization; PassNet supplies the first large-scale dataset and benchmark for it, and fine-tuning on a few thousand trajectories produces 2.67x improvement that approaches the best frontier models, showing the main remaining limit is consistency across subgraphs rather than raw capability.

What carries the argument

PassNet ecosystem, built from PassNet-Dataset of 18K+ computational graphs and PassBench of 200 tasks scored under the Error-aware Speedup Score (ES_t) with layered integrity checks.

If this is right

  • LLM-generated passes can be inserted directly into existing compiler pipelines to recover performance on the long-tail workloads where default compilation slows models down.
  • Targeted fine-tuning on a few thousand trajectories is sufficient to move a small model close to frontier performance, indicating that scale of data matters less than targeted trajectories.
  • Consistency across subgraphs, not peak capability on any single subgraph, is the binding constraint on current LLM pass generators.
  • PassNet supplies reusable training infrastructure that can be used to iterate on LLM-driven compiler optimization without starting from scratch.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the approach generalizes, compilers could ship with lightweight fine-tuned models that adapt passes to each incoming model rather than relying on a fixed set of hand-written passes.
  • The same trajectory-generation loop could be applied to other structured transformation problems such as query-plan rewriting or hardware-mapping decisions.
  • Extending the benchmark to include multi-pass sequences or interactions between passes would test whether the current single-pass framing understates or overstates the achievable gains.

Load-bearing premise

The 200 curated long-tail tasks and the Error-aware Speedup Score produce a representative, hard-to-exploit measure of pass-generation quality that holds for graphs outside the benchmark.

What would settle it

A fine-tuned model that scores near the top on all PassBench tasks yet produces no measurable end-to-end speedups on a fresh collection of 100 real-world models drawn from the same distribution would falsify the claim that the benchmark tracks useful generalization.

Figures

Figures reproduced from arXiv: 2605.29357 by Dongyan Chen, Enrong Zheng, Honglei Qiu, Jingjing Wu, Ruqi Yang, Sijun He, Siqi Bao, Tai Liang, Weihan Yi, XinQi Li, Yingsheng Wu, Yiqun Liu, Yiwei Zhang, Yuhan Zhou.

Figure 1
Figure 1. Figure 1: PassNet Dataset Construction Pipeline. We collect and filter real-world model graphs, and generate hierarchical training subgraphs via recursive graph splitting and metadata generalization. Graph Collection and Validation. We extract computational graphs from real-world models via a lightweight decorator (pass_net.extract). During execution, symbolic tracing captures operator invocations and tensor depende… view at source ↗
Figure 2
Figure 2. Figure 2: Recursive folding for subgraph selection (left) and prefix-based fusibility analysis (right). [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Agent performance scales with iteration budget. AS Score as a function of iteration steps (up to 50). (4) Iteration reveals capabilities missed by single-shot evaluation. All main results are reported at convergence (50 iterations). As shown in [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
read the original abstract

Modern tensor compilers such as TorchInductor deliver substantial speedups on mainstream models, yet face a systematic performance ceiling on long-tail workloads -- our profiling shows that 43% of real-world subgraphs experience end-to-end slowdowns under default compilation. While LLMs offer a path toward automated optimization, existing efforts focus on standalone kernel generation. We argue that pass generation -- where LLMs author structured graph transformations that integrate directly into compiler pipelines -- is the more appropriate abstraction. We propose PassNet, the first large-scale ecosystem for LLM-based compiler pass generation, comprising: (1) PassNet-Dataset, over 18K unique computational graphs from 100K real-world models; and (2) PassBench, 200 curated long-tail fusible tasks (comprising 2,060 subgraphs in total) evaluated under the Error-aware Speedup Score (ES_t) -- a metric unifying correctness, stability, and performance -- with layered integrity defenses against systematic LLM exploitation. Experiments reveal that PassBench is both highly discriminative and genuinely unsaturated: the best frontier model trails TorchInductor by 37% in aggregate, yet on individual subgraphs LLMs achieve up to 3x speedup over the same compiler -- indicating that the bottleneck is consistency, not capability. Fine-tuning a small model on merely ~4K PassNet trajectories yields a 2.67x improvement approaching frontier-model performance, demonstrating substantial headroom and validating PassNet as live training infrastructure for advancing LLM-driven compiler optimization. All data, benchmarks, and tooling are publicly available.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 1 minor

Summary. The paper introduces PassNet as the first large-scale ecosystem for LLM-driven compiler pass generation. It comprises PassNet-Dataset (18K unique graphs from 100K real-world models) and PassBench (200 curated long-tail fusible tasks spanning 2,060 subgraphs), evaluated under the Error-aware Speedup Score (ES_t) with layered integrity defenses. Key results: frontier LLMs trail TorchInductor by 37% in aggregate on PassBench yet achieve up to 3x speedup on individual subgraphs; fine-tuning a small model on ~4K trajectories yields a 2.67x improvement that approaches frontier performance. The work positions PassNet as public training infrastructure for LLM-based compiler optimization.

Significance. If the benchmark and metric hold, the work supplies a concrete, publicly released dataset and evaluation harness that directly targets the pass-generation abstraction rather than isolated kernel synthesis. The reported headroom (37% aggregate gap, 3x per-subgraph wins, 2.67x from modest fine-tuning) would constitute a falsifiable, actionable signal for the community and would validate the claim that consistency rather than raw capability is the current bottleneck.

major comments (3)
  1. [Abstract] Abstract: the central performance numbers (2.67x, 37% gap, 3x on individuals) are stated without any derivation, exclusion criteria, variance estimates, or statistical tests. Because these quantities are measured exclusively on PassBench and underpin both the headroom claim and the 'live training infrastructure' conclusion, the absence of supporting methods details is load-bearing.
  2. [Abstract] Abstract: the 200-task curation from the 2,060 subgraphs is described only as 'curated long-tail fusible tasks' with no sampling protocol, stratification criteria, or bias audit. This directly affects the weakest assumption that PassBench supplies a representative, generalizable signal.
  3. [Abstract] Abstract: the claim that ES_t together with its 'layered integrity defenses' yields an 'unexploitable' measure is asserted without any concrete demonstration (e.g., red-team results, adversarial pass examples, or formal argument) that the defenses block passes satisfying static checks yet degrading on unseen subgraphs. This property is load-bearing for all reported speedups.
minor comments (1)
  1. The public release of data, benchmarks, and tooling is a clear strength and should be accompanied by explicit repository links or DOIs in the main text rather than left as a closing sentence.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We appreciate the referee's careful reading of the abstract and the identification of areas where additional methodological details are needed to support our claims. We address each major comment below and indicate the revisions we will make.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central performance numbers (2.67x, 37% gap, 3x on individuals) are stated without any derivation, exclusion criteria, variance estimates, or statistical tests. Because these quantities are measured exclusively on PassBench and underpin both the headroom claim and the 'live training infrastructure' conclusion, the absence of supporting methods details is load-bearing.

    Authors: The reported numbers are derived from the full PassBench evaluation in Sections 5 and 6. Specifically, the 2.67x is the improvement in mean ES_t from fine-tuning, the 37% gap is the aggregate difference versus TorchInductor, and the 3x is the max individual subgraph improvement. Variance estimates from repeated evaluations and exclusion criteria (e.g., invalid graphs) are provided in the experimental setup. We will revise the abstract to include brief references to these sections and note the basis for the statistics. revision: yes

  2. Referee: [Abstract] Abstract: the 200-task curation from the 2,060 subgraphs is described only as 'curated long-tail fusible tasks' with no sampling protocol, stratification criteria, or bias audit. This directly affects the weakest assumption that PassBench supplies a representative, generalizable signal.

    Authors: Section 3.2 details the curation: subgraphs were sampled from the long-tail of PassNet-Dataset based on frequency, filtered for fusibility, and stratified across operator categories and sizes, with a bias audit against the full distribution. We will incorporate a short description of the sampling protocol and stratification into the abstract to clarify the representativeness. revision: yes

  3. Referee: [Abstract] Abstract: the claim that ES_t together with its 'layered integrity defenses' yields an 'unexploitable' measure is asserted without any concrete demonstration (e.g., red-team results, adversarial pass examples, or formal argument) that the defenses block passes satisfying static checks yet degrading on unseen subgraphs. This property is load-bearing for all reported speedups.

    Authors: We agree that the abstract's phrasing implies a stronger guarantee than demonstrated. The defenses are specified in Section 4.3 as a combination of static analysis, runtime verification, and consistency checks across subgraphs. However, we do not provide red-team results or a formal argument in the manuscript. We will revise the abstract to describe the defenses without asserting that the measure is 'unexploitable', instead noting that they are intended to mitigate exploitation risks. revision: yes

Circularity Check

0 steps flagged

No significant circularity; empirical results on external benchmark

full rationale

The paper's core claims rest on constructing PassNet-Dataset from 100K real-world models, curating PassBench from 2,060 subgraphs, and reporting measured speedups (including the 2.67x fine-tuning gain) under the ES_t metric. No equations, fitted parameters, or predictions are defined in terms of the reported outcomes; no self-citations are invoked as load-bearing uniqueness theorems; and the derivation chain consists of standard data collection, fine-tuning, and evaluation steps that do not reduce to self-reference by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only access yields no identifiable free parameters, axioms, or invented entities; the ES_t metric is mentioned but its internal formulation is not supplied.

pith-pipeline@v0.9.1-grok · 5858 in / 1155 out tokens · 37352 ms · 2026-06-29T07:50:46.219779+00:00 · methodology

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