| { |
| "created": "2026-09-26T14:56:20", |
| "code_commit": "30ad9b9a49f3e2905b396c4accf409bc26239815", |
| "repo": "SubstrateCommons/imperial-rocks", |
| "D0": 2.07e-09, |
| "T2B": 3.1, |
| "T": 3.0, |
| "dt_save": 0.0002, |
| "crop": "central 300^3", |
| "rocks": { |
| "LV60A": { |
| "rho": 4.1e-05, |
| "rho_note": "fitted to the LV60Y CPMG (thesis \u00a77.6.2)", |
| "table": "Table 7-1 / 7-2", |
| "figshare": "https://doi.org/10.6084/m9.figshare.1153795.v2", |
| "porosity": { |
| "ours": 0.3688355925925926, |
| "talabi": 0.377 |
| }, |
| "s_over_v": { |
| "ours": 59821.238561408434, |
| "talabi": 57670 |
| }, |
| "T2lm_ms": { |
| "replayed": 487.7, |
| "direct": 487.6, |
| "talabi_simulated": 512.0, |
| "talabi_measured": 496.0 |
| }, |
| "direct_walk": { |
| "recorded": true, |
| "n_walkers": 200000, |
| "dt_s": 0.0005, |
| "source": "examples/validation/talabi_micro_ct_rocks.py, asserted by tests/validation/test_talabi_rocks.py" |
| }, |
| "acceptance": { |
| "T2lm_replayed_ms": 487.7, |
| "T2lm_direct_ms": 487.6, |
| "T2_talabi_sim_ms": 512.0, |
| "rel_to_direct": 0.00029, |
| "tol": 0.00842, |
| "tolerance_terms": { |
| "direct_floor": 0.00223606797749979, |
| "pack_contact_floor": 0.004832018891264056, |
| "dt_systematic": 0.0031, |
| "tol": 0.00842432216958485 |
| }, |
| "inversion_sample_ms": 1.0, |
| "n_points": 3000, |
| "served_vs_channel": 1.1846357228506577e-12, |
| "monotone": true, |
| "envelope_worst_hz": 17.17, |
| "pack_band_hz": 21.33, |
| "envelope_in_band": true, |
| "pass": true |
| }, |
| "pack": { |
| "n_walkers": 45000, |
| "K": 128, |
| "band_hz": 21.33, |
| "certified": { |
| "sigma_star": 0.005, |
| "n_walkers": 45000, |
| "peak_rss_gb": 57.8, |
| "contact": { |
| "floor": 0.004832018891264056, |
| "err": 5.210667453070528e-10, |
| "meets_target": true |
| }, |
| "positions": { |
| "floor": 0.008549848807884411, |
| "err": 3.7322341429878124e-06, |
| "meets_target": false |
| }, |
| "note": "the contact tier is what this family is certified for; the gradient tier's floor is the split-half Monte-Carlo noise of the declared clinical envelope at this walker count, which the 60 GB build budget caps at 45000 walkers (measured: 1.27 GB per 1000 walkers on this window). 5e-3 on the gradient tier needs ~184,000 walkers and ~234 GB; rebuild with imperial-rocks/build.py --n-walkers to get it." |
| } |
| } |
| }, |
| "F42A": { |
| "rho": 4.1e-05, |
| "rho_note": "fitted to the F42Y CPMG (thesis \u00a77.6.2)", |
| "table": "Table 7-1 / 7-2", |
| "figshare": "https://doi.org/10.6084/m9.figshare.1189259.v1", |
| "porosity": { |
| "ours": 0.33062044444444444, |
| "talabi": 0.33 |
| }, |
| "s_over_v": { |
| "ours": 44431.61992411219, |
| "talabi": 43770 |
| }, |
| "T2lm_ms": { |
| "replayed": 674.4, |
| "direct": 679.0, |
| "talabi_simulated": 677.0, |
| "talabi_measured": 668.0 |
| }, |
| "direct_walk": { |
| "recorded": true, |
| "n_walkers": 200000, |
| "dt_s": 0.0005, |
| "source": "examples/validation/talabi_micro_ct_rocks.py, asserted by tests/validation/test_talabi_rocks.py" |
| }, |
| "acceptance": { |
| "T2lm_replayed_ms": 674.4, |
| "T2lm_direct_ms": 679.0, |
| "T2_talabi_sim_ms": 677.0, |
| "rel_to_direct": 0.0068, |
| "tol": 0.0094, |
| "tolerance_terms": { |
| "direct_floor": 0.00223606797749979, |
| "pack_contact_floor": 0.005891480335269983, |
| "dt_systematic": 0.0031, |
| "tol": 0.009401550645743705 |
| }, |
| "inversion_sample_ms": 1.0, |
| "n_points": 3000, |
| "served_vs_channel": 2.3079316235907754e-12, |
| "monotone": true, |
| "envelope_worst_hz": 17.0, |
| "pack_band_hz": 21.33, |
| "envelope_in_band": true, |
| "pass": true |
| }, |
| "pack": { |
| "n_walkers": 45000, |
| "K": 128, |
| "band_hz": 21.33, |
| "certified": { |
| "sigma_star": 0.005, |
| "n_walkers": 45000, |
| "peak_rss_gb": 57.8, |
| "contact": { |
| "floor": 0.005891480335269983, |
| "err": 5.284309656516939e-10, |
| "meets_target": false |
| }, |
| "positions": { |
| "floor": 0.00915603992321078, |
| "err": 6.069027146376907e-06, |
| "meets_target": false |
| }, |
| "note": "the contact tier is what this family is certified for; the gradient tier's floor is the split-half Monte-Carlo noise of the declared clinical envelope at this walker count, which the 60 GB build budget caps at 45000 walkers (measured: 1.27 GB per 1000 walkers on this window). 5e-3 on the gradient tier needs ~184,000 walkers and ~234 GB; rebuild with imperial-rocks/build.py --n-walkers to get it." |
| } |
| } |
| } |
| }, |
| "caveats": { |
| "LV60A_crop": "Talabi's 0.377 porosity is not reachable on the released LV60A image: over all 3,442,951 possible 300^3 crops the porosity spans [0.3555, 0.3713]. The offset he used is not recorded in the thesis, and a central cube is what his other six samples' porosities support. That is the whole of LV60A's porosity gap, and it is not the walk.", |
| "rho": "rho = 41 um/s is HIS, fitted by him to his own LV60Y / F42Y CPMG (thesis \u00a77.6.2) and not to anything measured here. It is an effective value tied to his ~10 um voxel: the surface a segmentation gives is the Manhattan area at that resolution, which is what both walks relax against, so it does not transfer to another resolution.", |
| "surface_rule": "His discrete surface rule is not this one: he kills a walker at an attempted move into a grain voxel with probability 2 rho s / (3 D), this walk weights it by exp(-2 (rho/D) d_perp) per specular reflection. They agree in the continuum limit.", |
| "inversion": "The log-mean is the weakest link in this comparison, and the numbers above are all on a 1 ms sampling of the decay. Measured on F42A, which still holds 3.3 % of its signal at 3 s: 674.4 ms at 1 ms sampling, 668.0 at 10 ms, 309.7 at 20 ms -- a truncated decay lets the regularised solve split amplitude between a short and a very long component. LV60A, down to 1.0 %, is 487.7 / 487.6 / 487.4 at the same three. Over lambda in [0.003, 1] and five T2 grids the log-mean spans 3.1 % on LV60A and 4.2 % on Berea." |
| } |
| } |
