Midtraining Bridges Pretraining and Posttraining Distributions

rl

post-training

Systematic study of midtraining as distributional bridging between pretraining and posttraining; benefits code/math domains, mitigates forgetting, and timing-weight interaction matters.

Published

March 3, 2026

Summary

One-paragraph summary of the paper’s contribution.

Link: arXiv | PDF

Key Ideas

Method

Describe the core technical approach.

Results

What did they show? Key numbers or comparisons.

Strengths

Weaknesses / Limitations

Relevance to My Work

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Key Takeaways

---
title: "Midtraining Bridges Pretraining and Posttraining Distributions"
description: "Systematic study of midtraining as distributional bridging between pretraining and posttraining; benefits code/math domains, mitigates forgetting, and timing-weight interaction matters."
date: "2026-03-03"
categories: [rl, post-training]
paper:
  authors: "Emmy Liu, Graham Neubig, Chenyan Xiong"
  year: "2025"
  venue: "arXiv"
  url: "https://arxiv.org/abs/2510.14865"
---

## Summary

One-paragraph summary of the paper's contribution.

- **Link:** [arXiv](https://arxiv.org/abs/2510.14865) | [PDF](https://arxiv.org/pdf/2510.14865)

## Key Ideas

1.

## Method

Describe the core technical approach.

## Results

What did they show? Key numbers or comparisons.

## Strengths

-

## Weaknesses / Limitations

-

## Relevance to My Work

How does this connect to MedEnv, GRPO, or other active projects?

## Key Takeaways

-