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fix(scan): a portion sizer that never extrapolates from a sample with no work in it

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Measured on the plugin, first run of the adaptive sizer. A 600-visit portion answered in 184 s and
the budget was correctly cut to 262. The next portion, 199 visits, answered in 73 s -- three seconds
of work above the 70 s fixed start -- and 3 s over 199 visits read as 0.015 s each, so the budget
grew thirteen-fold to 3,404 visits. The ceiling killed that portion. The harvest kept the 13
answers it had streamed, which is the mechanism working; the sizing was not.

Two rules. A sample with less than ten seconds of work above the fixed start is not extrapolated
from, because it carries no information about cost per visit. And a budget may double per portion,
never more: the sizing may still be wrong, but by at most one factor of two, which a kill undoes.

1,423 tests pass, nineteen skipped; the sizer control asserts both rules.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo
This commit is contained in:
Marius Ciepluch
2026-09-22 22:17:30 +02:00
co-authored by Claude Fable 5.1
parent e3edf11cf8
commit 1aa7f175e9
2 changed files with 18 additions and 3 deletions
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tests/test_model_scope.py
+7
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@@ -338,3 +338,10 @@ def test_a_portion_sizer_shrinks_to_budget_and_learns_from_what_answered() -> No
assert sizer.budget == 300.0
sizer.observe({"y": {}, "z": {}}, scan.PORTION_FIXED_SECONDS + 20.0, answered=True) # 0.1 s per visit
assert 450 < sizer.budget < 550, sizer.budget
# A portion that finished inside the fixed start says nothing: the budget must not move on it.
before = sizer.budget
sizer.observe({"y": {}}, scan.PORTION_FIXED_SECONDS + 1.0, answered=True)
assert sizer.budget == before
# And a genuinely cheap portion may double the budget, never more: 0.01 s per visit would fit 5,000.
sizer.observe({"w": {}}, scan.PORTION_FIXED_SECONDS + 5.0 + 5.0, answered=True)
assert sizer.budget == before * scan.PORTION_MAX_GROWTH, sizer.budget