Fine-Tuning Large Language Models for Structured ClinicalReport Generation Using GRPO
Bibliographic record
Abstract
The generation of structured medical reports using large language models (LLMs) presents unique challenges, particularly in maintaining clinical relevance and adhering to strict formatting requirements. In this work, we investigate the effectiveness of fine-tuning LLMs for structured report generation using DeepSeek R1 models. We conduct experiments with two model variants: DeepSeek R1 8B and DeepSeek R1 14B. For both models, we apply Group Relative Policy Optimization (GRPO) using the Medical Information Mart for Intensive Care (MIMIC-IV) dataset, leveraging Low-Rank Adaptation (LoRA) for parameter-efficient fine-tuning. Our results show that the GRPO fine-tuned DeepSeek-R1 8B and 14B models outperformed all baseline models, including the larger 32B DeepSeek-R1 model, demonstrating the effectiveness of parameter-efficient tuning. These findings underscore the potential of reinforcement learning-based fine-tuning of LLMs for generating structured reports in the medical domain.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".