Cross-Configuration Drift Report

The cross-configuration runner writes a sealed, append-only attempt directory. The report tool reads that directory after COMPLETE has been published and renders the recorded comparison rather than re-running a model. It shows actual operator provenance, requested TP/CP and dtype axes, the fixed comparison threshold, and the worst active selected-token delta.

Generate the offline desktop bundle from one completed attempt:

python -m rl_engine.alignment.cross_config report \
  runs/<experiment>/cases/<case>/attempt-0001 \
  --output /tmp/qwen3-tp2-cp2.rlk-drift

The .rlk-drift file contains sanitized report JSON, a Chrome Trace Event JSON trace, and a PNG preview. It excludes checkpoints, prompts, and raw score tensors. Install the optional local viewer and open it without a browser:

python -m pip install "rl-engine[drift-viewer]"
rlk-drift-view /tmp/qwen3-tp2-cp2.rlk-drift

The viewer has an expandable track tree, horizontal zoom/scroll, selectable events, and an event-details panel. The horizontal scale is explicitly marked as a sample ordinal unless the source artifacts contain real timestamps.

Other output suffixes expose the same sealed evidence in a form suitable for a specific workflow:

Suffix	Artifact	Intended use
.rlk-drift	Offline desktop bundle	Interactive post-training triage
.png, .jpg	Static summary	Pull request or issue attachment
.json	Chrome Trace Event	Perfetto or trace-viewer inspection

An unsealed or malformed attempt is rejected. A failed identity gate stays not comparable; the tool does not turn it into a numerical drift value.