PRM_1541i

1541 preference pairs for training a critic over coding-agent trajectories. Each example is a multi-turn agent transcript paired with two candidate critiques — one preferred, one rejected.

A critique is a structured error analysis over 12 categories, each with a DETECTED: Yes/No verdict and, when detected, EVIDENCE and RECOVERY_ACTION fields, closing with TASK_STATUS and OVERALL_GUIDANCE.

Format

ShareGPT / LLaMA-Factory layout (dataset_info.json included):

{
  "messages":  [{"role": "system", ...}, {"role": "user", ...}, ...],
  "chosen":    {"role": "assistant", "content": "SPECIFICATION ERRORS:\n1. ..."},
  "rejected":  {"role": "assistant", "content": "SPECIFICATION ERRORS:\n1. ..."}
}

messages ends on a user turn; chosen and rejected are single assistant messages. To use with TRL's conversational preference format:

from datasets import load_dataset

def to_preference(example):
    return {
        "prompt": example["messages"],
        "chosen": [example["chosen"]],
        "rejected": [example["rejected"]],
    }

dataset = load_dataset("code-critic-model/PRM_1541i", split="train")
dataset = dataset.map(to_preference, remove_columns=["messages"])
dataset = dataset.train_test_split(test_size=0.1, seed=42)  # 1386 train / 155 eval

Length filtering

Pre-filtered so that every pair fits whole in 8192 tokens under the Qwen/Qwen3-4B-Instruct-2507 tokenizer, measured the way DPOTrainer measures it (render with the chat template, then tokenize prompt and prompt + completion). Nothing is truncated or dropped at train time. Prompts are long — around 7000 tokens — and completions are around 580.

Statistics

Measured over all 1541 pairs:

pairs	1541
median prompt length	~7000 tokens
median completion length	~580 tokens
OVERALL_GUIDANCE share of completion	12.5% (median 74 tokens)
pairs where chosen/rejected flip >= 1 DETECTED verdict	892 (57.9%)
pairs differing in prose only (identical verdicts)	649 (42.1%)
median flipped DETECTED labels per pair	1
median char similarity, pre-OVERALL_GUIDANCE section	0.399
pairs whose common prefix reaches OVERALL_GUIDANCE	8.2%

The last three rows matter for anyone planning to slice this data. The chosen and rejected critiques are not identical up to the guidance paragraph — they diverge a median of ~1859 characters before OVERALL_GUIDANCE begins, and the categorization sections differ substantially. Training only on the OVERALL_GUIDANCE span would discard ~87% of the tokens and most of the signal.

Slicing by pair type does not help either: in a DPO run on this data, the verdict-flip subset scored 0.620 held-out preference accuracy and the prose-only subset 0.618 — statistically indistinguishable.

Models trained on this dataset

• code-critic-model/Qwen3-4B-DPO-beta0.1-sft0.25-lr1e-6-bs32-ep1 — 0.619 held-out preference accuracy vs 0.516 for the base model.