PRM trainer and configuration vendored from Hugging Face TRL v1.13.0.
Source: https://github.com/huggingface/trl/tree/v1.13.0/trl/experimental/prm
Revision: 3d9261f1fec9f9a8140099c78a65c7da73dce79c
Copyright 2020-2026 The HuggingFace Team. All rights reserved.
Licensed under the Apache License, Version 2.0; see LICENSE.

Axolotl modifications: import shared helpers from the installed TRL package,
import PRM modules locally, and apply repository formatting.
