1 rollout_tree_summary_rows

rollouts.rollout_tree_summary_rows(reader)

Summarize selected rollout-tree provenance by policy, step, and family.

Rollout stores persist factual selected chains, not a full parent-edge tree. This helper therefore reports the observed branching/provenance distribution across selected steps: policy/recipe parameters, candidate family, fanout, invalidity, and selected objective values.

# rollout_tree_summary_rows { #aria_nbv.rollouts.rollout_tree_summary_rows }

```python
rollouts.rollout_tree_summary_rows(reader)
```

Summarize selected rollout-tree provenance by policy, step, and family.

Rollout stores persist factual selected chains, not a full parent-edge tree.
This helper therefore reports the observed branching/provenance distribution
across selected steps: policy/recipe parameters, candidate family, fanout,
invalidity, and selected objective values.