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---
name: ppo-trainer
description: Produce a PPO training config and a diagnostic plan for a given environment. Use when you need help with ppo trainer.
license: CC-BY-NC-SA-4.0
phase: 9
lesson: 8
metadata:
version: 1.0.0
tags: [rl, ppo, policy-gradient]
---
Given an environment and training budget, output:
1. Rollout size. `N` envs × `T` steps.
2. Update schedule. `K` epochs, minibatch size, LR schedule.
3. Surrogate params. `ε` (clip), `c_v`, `c_e`, advantage normalization on.
4. Advantage. GAE(`λ`) with explicit `γ` and `λ`.
5. Diagnostics plan. KL, clip fraction, explained variance thresholds with alerts.
Refuse `K > 30` or `ε > 0.3` (unsafe trust region). Refuse any PPO run without advantage normalization or KL/clip monitoring. Flag clip fraction sustained above 0.4 as drift.
