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test: depth-2 twin of the nested shear preset (twin_shear_n128)

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Test-only opt-in. New shear_twin.py: same two L0->L1 boxes as
shear_nested, no L2; leaves [7936,33792], hops [2048,4096], work
154664960. Four fresh cases U128/U256/constant R128 d2/projected R128 d2;
physics is the unchanged depth-2/2N shear_wave.assess. run_case:
--diagnostic twin_shear_n128 with shear_twin.py+shear_nested.py pins, no
snapshot. assess_shear_wave: nested contract made preset-generic (PRESETS)
with nested behaviour unchanged. Labels: twin vs nested = effect of adding
this nested refinement (not abstract depth). shear_wave.py, shear_nested.py
and oracle.py byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ClaudeandClaude Opus 5.5 committed 2026-10-19 02:52:20 +00:00
1 parent 335624c27b
commit 02bde0f751
5 files changed
+304 -41
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tests/validation/taylor_green/run_case.py
+26 -11
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@@ -23,6 +23,8 @@ SCALED_DIAGNOSTIC = "scaled_n256"
SCALED_SHEAR = "scaled_shear_n256" # mutually exclusive with scaled_n256 (one flow each)
NESTED_SHEAR = "nested_shear_n128" # fixed three-level/two-region shear preset
SHEAR_NESTED_SHA256 = "fa6cfe87fb4df8c6d732c637c885276833c81973b950c7724d734f8fc350bcb0"
TWIN_SHEAR = "twin_shear_n128" # depth-2 twin: nested L0->L1 boxes without L2
SHEAR_TWIN_SHA256 = "1cbf37f18e89aea577581631c4565f51e68d22a3739b698816ef64acbf2b2bb4"
def flow_functions(flow="taylor_green"):
@@ -111,14 +113,21 @@ def verify_source(repo, revision, flow="taylor_green"):
if result["source_tree_sha256"] != SOURCE_SHA256:
raise RuntimeError("Wrong numerical source fingerprint")
result["build_capture_sha256"] = BUILD_CAPTURE_SHA256
if flow == "shear_nested":
if flow == "shear_twin":
import shear_twin
module = harness / "shear_twin.py"
if (Path(shear_twin.__file__).resolve() != module
or hashlib.sha256(module.read_bytes()).hexdigest() != SHEAR_TWIN_SHA256):
raise RuntimeError("Wrong shear_twin module checkout or content")
result["shear_twin_sha256"] = SHEAR_TWIN_SHA256
if flow in ("shear_nested", "shear_twin"): # the twin reuses the nested geometry
import shear_nested
module = harness / "shear_nested.py"
if (Path(shear_nested.__file__).resolve() != module
or hashlib.sha256(module.read_bytes()).hexdigest() != SHEAR_NESTED_SHA256):
raise RuntimeError("Wrong shear_nested module checkout or content")
result["shear_nested_sha256"] = SHEAR_NESTED_SHA256
if flow in ("shear_wave", "shear_nested"):
if flow in ("shear_wave", "shear_nested", "shear_twin"):
import shear_wave
module = harness / "shear_wave.py"
if (Path(shear_wave.__file__).resolve() != module
@@ -191,10 +200,12 @@ def main():
p.add_argument("--depth", type=int, choices=[1, 2, 3], required=True)
p.add_argument("--output", type=Path, required=True)
p.add_argument("--explosion", choices=["constant", "projected_linear"], default="constant")
p.add_argument("--diagnostic", choices=[SCALED_DIAGNOSTIC, SCALED_SHEAR, NESTED_SHEAR],
p.add_argument("--diagnostic",
choices=[SCALED_DIAGNOSTIC, SCALED_SHEAR, NESTED_SHEAR, TWIN_SHEAR],
help="explicit four-case N256/fine512 same-placement diagnostic "
"(scaled_n256: Taylor-Green; scaled_shear_n256: shear wave) or the "
"fixed three-level/two-region shear preset (nested_shear_n128)")
"fixed three-level/two-region shear preset (nested_shear_n128) "
"or its depth-2 twin (twin_shear_n128)")
p.add_argument("--final-snapshot", action="store_true",
help="nested_shear_n128 projected depth-3 only: final macro snapshot")
p.add_argument("--early-pressure", action="store_true",
@@ -213,12 +224,15 @@ def main():
p.error("Output already exists; choose a new path to retain prior evidence")
if args.explosion != "constant" and args.depth != 2 and not nested:
p.error("projected_linear requires depth 2")
if nested:
twin = args.diagnostic == TWIN_SHEAR
if nested or twin:
import shear_nested
import shear_twin
preset = shear_nested if nested else shear_twin
if args.flow != "shear_wave":
p.error(f"--diagnostic {NESTED_SHEAR} requires --flow shear_wave")
if (args.re, args.n, args.depth, args.explosion) not in shear_nested.CASES:
p.error("nested_shear_n128 requires one of its four Re100 cases")
p.error(f"--diagnostic {args.diagnostic} requires --flow shear_wave")
if (args.re, args.n, args.depth, args.explosion) not in preset.CASES:
p.error(f"{args.diagnostic} requires one of its four Re100 cases")
elif args.diagnostic:
cases = {(256, 1, "constant"), (512, 1, "constant"),
(256, 2, "constant"), (256, 2, "projected_linear")}
@@ -238,7 +252,8 @@ def main():
p.error("--run-gpu and exactly one explicit CUDA_VISIBLE_DEVICES are required")
repo = args.repo.resolve()
sys.path[:0] = [str(repo / "src"), str(repo)]
source = verify_source(repo, args.expected_revision, "shear_nested" if nested else args.flow)
source = verify_source(repo, args.expected_revision,
"shear_nested" if nested else "shear_twin" if twin else args.flow)
runtime = runtime_source(repo)
if args.dry_run:
print(json.dumps(dict(source=source, runtime_source=runtime, dry_run=True,
@@ -254,8 +269,8 @@ def main():
cfg = config(args.n, args.re)
if args.depth == 1:
refinements = []
elif nested:
refinements = [list(level) for level in shear_nested.REFINEMENTS]
elif nested or twin:
refinements = [list(level) for level in preset.REFINEMENTS]
else:
refinements = rectangles(args.n, args.depth)
h = build_hierarchy(cfg, refinements)