# PAct Root-Frame Axis v04

Generated: `2026-05-16T04:05:22+00:00`
Portal: `http://106.14.105.96:28080/experiments/pact-transporter-root-frame-axis-v04-20260516/index.html`

v04 tests whether root/body local-frame PCA candidates can rescue the remaining non-canonical button-axis failures after semantic expansion.

| mode | F1 | precision | recall | count err | axis err |
|---|---:|---:|---:|---:|---:|
| `raw` | 0.0303 | 0.0303 | 0.0303 | 10.6364 | 81.87 |
| `semantic` | 0.5657 | 0.5657 | 0.5657 | 0.0909 | 33.64 |
| `axis_knn` | 0.7048 | 0.7081 | 0.7020 | 0.0909 | 20.50 |
| `root_frame` | 0.9079 | 0.9096 | 0.9066 | 0.0909 | 3.82 |

## Interpretation

The improvement, if any, should be read as evidence for a Stage-2 local-frame articulation head.  This probe uses available part geometry as a proxy; a deployable model should predict the same frame from PAct part tokens and generated sparse structures.