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validation and profiles

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Miha Kralj
2026-02-26 22:02:52 -08:00
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lib/statistics/entropy/Entropy.md
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@@ -40,6 +40,21 @@ Output is in [0, 1] where:
## Performance Profile
### Operation Count (Streaming Mode)
Entropy computes Shannon entropy over a sliding window after binning values into discrete buckets.
| Operation | Count | Cost (cycles) | Subtotal |
| :--- | :---: | :---: | :---: |
| Ring buffer add/evict | 1 | 3 cy | ~3 cy |
| Re-bin all N values | N | 3 cy | ~3N cy |
| Build frequency table | N | 2 cy | ~2N cy |
| Compute sum(-p * log p) | k | 8 cy | ~8k cy |
| NaN guard + state update | 1 | 2 cy | ~2 cy |
| **Total (N=20, k=5 bins)** | **O(N)** | — | **~107 cy** |
O(N) per update due to full window rebinning each bar. No O(1) sliding-window entropy algorithm exists for exact bin counts.
| Metric | Score | Notes |
| :--- | :--- | :--- |
| **Throughput** | ~50ns/bar | Histogram rebuild each update. |