<div class="section-label"><span class="num">01</span> Config</div>
<div class="section-title"><em>Dial</em> in how the RBP engine runs.</div>
Before you call Predict, MaxFit, or Grid, you choose thresholds, censoring, and a few search controls. Most settings are shared; MaxFit and Grid add a short list of their own.
What to call lives under [[Functions/Overview|Functions]]. What comes back lives under [[Results/Overview|Results]].
<div class="pillars">
<div class="pillar">
<div class="pillar-num">↳ 01</div>
<div class="pillar-title">Shared base</div>
<div class="pillar-text">Thresholds, censor type, scale, and numerical knobs used by every prediction path.</div>
</div>
<div class="pillar">
<div class="pillar-num">↳ 02</div>
<div class="pillar-title">Path extras</div>
<div class="pillar-text">MaxFitOptions adds an objective. GridOptions adds combination search, seed, and retain.</div>
</div>
<div class="pillar">
<div class="pillar-num">↳ 03</div>
<div class="pillar-title">Defaults</div>
<div class="pillar-text">Omit options entirely and each path uses its own sensible starting point.</div>
</div>
</div>
<p> </p>
<div class="section-label"><span class="num">02</span> In this chapter</div>
<div class="solution-list">
<div class="solution-row">
<div class="solution-num">/01</div>
<div class="solution-title"><a href="/Config/Options">Options</a></div>
<div class="solution-desc">PredictOptions, MaxFitOptions, GridOptions, defaults, and retain grid objects.</div>
</div>
<div class="solution-row">
<div class="solution-num">/02</div>
<div class="solution-title"><a href="/Config/Allowed%20Values">Allowed values</a></div>
<div class="solution-desc">The named choices you can pass: relevance vs similarity, fit objectives, retain policies, and more.</div>
</div>
</div>
## How options nest
```mermaid
classDiagram
direction TB
class PredictOptions {
shared base fields
}
class MaxFitOptions {
+objective
+inner_parallel
}
class GridOptions {
+max_iter
+k
+seed
+attribute_combi
+retain_grid_objects
+inner_parallel
}
PredictOptions <|-- MaxFitOptions
PredictOptions <|-- GridOptions
```
<div class="btn-row">
<a class="btn-primary" href="/Config/Options">Browse options</a>
<a class="btn-ghost" href="/Functions/Overview">Back to Functions</a>
</div>