# Offline RL: CQL and IQL

```{raw} html
<p class="breakrl-reader-head">
  Same failure mode as the
  <a href="demo-en.html">minimum demo</a>
  and
  <a href="failure-atlas-en.html#atlas-8-offline-loss">Failure Atlas #8</a>:
  healthy offline loss, collapsing returns.
  CartPole teaching experiment; the page renders
  <a href="notes/offline-rl/offline-rl-en.html">saved notebook output</a>
  and does not train.
  <a href="notes/offline-rl/offline-rl-en.pdf">Open the PDF</a>
  if the embed is unavailable.
</p>
<object class="breakrl-chapter-pdf" data="notes/offline-rl/offline-rl-en.pdf" type="application/pdf">
  <p><a href="notes/offline-rl/offline-rl-en.pdf">Open the Offline RL chapter PDF</a>.</p>
</object>
```