{ "frozen_method": { "frozen_utc": "2026-10-04T13:30:06.332615+00:00", "signature": { "specification_sha256": "8277b14044162e06cdb03a4905fa102b2c9f91e8d059f1cd0fd497152a17e6c3", "known_csv_sha256": "3c782daea78862d3cbda83433d231e8412a126c7dda130af1696f22b2d5e0916", "script_sha256": "b917a1116cc4104da36e6aac466354a00e82c966e0568965f92225fccf326d6b" }, "specification": { "method": "Fixed nearest batch centroid using equally standardized RMS distance", "segmentation_variant": "stacked_three_channel", "class_order": [ "Batch_1", "Batch_2", "Batch_3" ], "features": [ { "key": "porosity_pct", "label": "Pore-labelled area fraction", "unit": "%" }, { "key": "porosity_ci95_pct", "label": "Porosity uncertainty half-width", "unit": "percentage points" }, { "key": "active_material_pct", "label": "Graphite-labelled area fraction", "unit": "%" }, { "key": "cbd_pct", "label": "Carbon-binder allocation", "unit": "%" }, { "key": "inclusion_pct", "label": "Silicon-labelled area fraction", "unit": "%" }, { "key": "char_length_scale_cls_um", "label": "Pore correlation length", "unit": "\u00b5m" }, { "key": "throat_through_plane_ly_um", "label": "Vertical pore chord", "unit": "\u00b5m" }, { "key": "chord_in_plane_lx_um", "label": "Horizontal pore chord", "unit": "\u00b5m" }, { "key": "pore_anisotropy_ratio", "label": "Horizontal/vertical pore chord ratio", "unit": "ratio" }, { "key": "particle_aspect_ratio", "label": "Silicon-labelled domain aspect ratio", "unit": "ratio" }, { "key": "particle_d50_um", "label": "Silicon-labelled domain diameter D50", "unit": "\u00b5m" }, { "key": "particle_d90_um", "label": "Silicon-labelled domain diameter D90", "unit": "\u00b5m" }, { "key": "slurry_dispersion_index", "label": "Silicon-labelled area spatial variation", "unit": "percentage points" } ], "excluded_field": "particle_d10_um, omitted in both methods to retain the previously compared common13 fields", "scaling": "Sample standard deviation (ddof=1) across known training crops only; refitted inside each leave-one-out fold", "tie_rule": "First class in Batch_1, Batch_2, Batch_3 order; exact ties have zero relative margin", "relative_margin_formula": "(runner_up_distance - nearest_distance) / runner_up_distance; zero for an all-zero tie", "confidence_combination": "Band the class-level observed validation precision using the user's cutoffs; geometry diagnostics do not alter the band", "support_envelope": "Assigned-class distance <=95th percentile (linear interpolation) of known true-class leave-one-crop-out distances", "stability": "Fraction of31 leave-one-known-crop-out refits retaining the full-fit assignment", "feature_contributions": "(runner-up squared standardized deviation minus assigned squared standardized deviation)/13; sum equals runner-up squared RMS distance minus assigned squared RMS distance", "limitations": [ "The ratings are heuristic assignment support, not calibrated probabilities.", "Known crops may share original images; parent-image groups are unavailable. Leave-one-crop-out evaluation can therefore be optimistic.", "Per-class precision estimates are based on few crop predictions and unknown test class proportions.", "Thirteen equally standardized exported fields retain correlated and derived variables, including porosity uncertainty and the carbon-binder allocation. They are not thirteen independent physical mechanisms.", "The support envelope is an empirical distance summary, not a conformal prediction region or a 95% probability statement.", "Leave-one-crop-out agreement measures sensitivity to individual known crops, not correctness or uncertainty in phase boundaries.", "Silicon-labelled mask boundaries remain unvalidated and can include rims or lines; pore chords do not establish three-dimensional transport.", "Three earlier test identities have already been revealed. This is not an untouched external validation exercise; test labels are nevertheless excluded from fitting and confidence calculations.", "Batch identity does not establish manufacturing quality. No accept or reject decision is produced." ], "confidence_policy": "empirical_precision_v2", "confidence_policy_v2": { "requested_by": "User", "threshold_source": "Explicit user instruction; no outcome-based threshold search", "revision_context": "Reporting bands revised after the v1 assignment summary. The fitted classifier, features and assignments are unchanged.", "score": "100 * correctly assigned known crops / all known crops predicted as the assigned class in leave-one-crop-out evaluation", "score_scope": "Class-level observed validation precision; not an individual calibrated probability", "thresholds": { "High": "strictly greater than70%", "Medium": "50% through70%, inclusive", "Low": "below50%" }, "other_checks": "Distance margin, omission agreement and empirical support envelope remain diagnostics and do not change this user-defined band" }, "diagnostic_thresholds_v1": { "High": { "oof_precision_min": 0.85, "oof_prediction_count_min": 5, "relative_margin_min": 0.25, "leave_one_crop_out_agreement_min": 0.9 }, "Medium": { "oof_precision_min": 0.6, "oof_prediction_count_min": 5, "relative_margin_min": 0.1, "leave_one_crop_out_agreement_min": 0.75 } }, "confidence_thresholds": { "High": "strictly greater than70%", "Medium": "50% through70%, inclusive", "Low": "below50%" } }, 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spatial variation", "unit": "percentage points", "value": 6.069166212443094, "known_batches": { "Batch_1": { "mean": 5.2201932001159355, "sample_sd": 1.3945807444085343, "min": 3.6776692995189832, "max": 7.884880535740902 }, "Batch_2": { "mean": 5.378282548191005, "sample_sd": 0.4886788772366647, "min": 4.696717520084347, "max": 5.9849893879906775 }, "Batch_3": { "mean": 5.636535648662531, "sample_sd": 1.0403096768411866, "min": 3.5324537062792625, "max": 7.519104617207586 } }, "assigned_minus_runner_squared_distance_support": -0.021338579302565233, "standardized_difference_from_assigned_mean": 0.6755341216614655, "difference_from_batch3_mean": 0.4326305637805623 } ], "manufacturing_decision": "Not evaluated", "diagnostic_confidence_v1": "Low", "confidence_pct": 20.0, "validation_rate_pct": 20.0, "validation_n_correct": 2, "validation_n_predictions": 10, "explanation": "2 of 10 held-out known crops assigned to Batch 2 were correctly identified (20.0%). This is a class-level validation rate, not an individual probability. 25 of 31 crop-omission refits retained this assignment. The nearest alternatives are close (relative distance margin 1.0%). This image is outside the assigned class's empirical distance envelope." } ], "confidence_policy_v2": { "requested_by": "User", "threshold_source": "Explicit user instruction; no outcome-based threshold search", "revision_context": "Reporting bands revised after the v1 assignment summary. The fitted classifier, features and assignments are unchanged.", "score": "100 * correctly assigned known crops / all known crops predicted as the assigned class in leave-one-crop-out evaluation", "score_scope": "Class-level observed validation precision; not an individual calibrated probability", "thresholds": { "High": "strictly greater than70%", "Medium": "50% through70%, inclusive", "Low": "below50%" }, "other_checks": "Distance margin, omission agreement and empirical support envelope remain diagnostics and do not change this user-defined band" } }