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Jul 20, 2026Gymnasium render_mode='human' Crashes Training: 3 Fixes
The render_mode='human' Trap That Kills Your Training Loop Set render_mode='human' in your...
Jul 20, 20261 min read0 reactions0 comments
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May 21, 2026Gymnasium Custom Env Step() Returns Invalid Shape: 5 Fixes
The Error That Breaks Every Custom Gymnasium Environment Your step() function returns a...
May 21, 20261 min read0 reactions0 comments
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Apr 26, 2026On-Policy vs Off-Policy RL: PPO vs SAC on 5 Gymnasium Tasks
The Counterintuitive Truth About Sample Efficiency SAC should destroy PPO on sample...
Apr 26, 20261 min read0 reactions0 comments
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May 2, 2026Q-Learning from Scratch: 50-Line Agent Beats Random by 94%
The Algorithm Everyone Skips Most RL tutorials rush you into DQN, PPO, or some other...
May 2, 20261 min read0 reactions0 comments
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Apr 13, 2026PPO vs A2C: CartPole Training Speed & Sample Efficiency
Why A2C Often Trains Faster Than PPO (Until It Doesn't) Most RL tutorials pick PPO as the...
Apr 13, 20261 min read0 reactions0 comments
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Apr 10, 2026Gymnasium Custom Environment: 7 Patterns That Save Hours
Why Most Custom Environments Break in Subtle Ways Your custom Gymnasium environment passes...
Apr 10, 20261 min read0 reactions0 comments
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Apr 2, 2026PPO vs DQN: Discrete Action Spaces Beat Continuous 3x
Most RL Tutorials Get the Algorithm Choice Backwards Pick DQN for CartPole. Pick PPO for...
Apr 2, 20261 min read0 reactions0 comments