CLAUDE.md: update UNDF count to 757

This commit is contained in:
russell@unturf.com 2026-03-30 09:39:06 -04:00
parent fbc56da95b
commit 7aee87ab40
5 changed files with 459 additions and 68 deletions

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@ -124,7 +124,7 @@ git push
### Current counts (update when generator runs)
**749** assigned | **749** UNDF posts | last run: 2026-03-30
**757** assigned | **757** UNDF posts | last run: 2026-03-30
### Patch stamp format

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@ -0,0 +1,57 @@
# UNDF: UNDF-2026-000000485
# UNDF: (leave blank)
--- a/modules/objdetect/src/qrcode.cpp
+++ b/modules/objdetect/src/qrcode.cpp
@@ -2088,12 +2088,17 @@ bool QRDecode::divideIntoEvenSegments(vector<vector<Point2f> > &segments_points)
float mean_num_points_in_line = 0.0;
for (int i = 0; i < NUM_SIDES; i++)
{
mean_num_points_in_line += spline_lines[i].size();
}
mean_num_points_in_line /= NUM_SIDES;
const int min_num_points = 1, max_num_points = cvRound(mean_num_points_in_line / 2.0);
float linear_threshold = 0.5f;
for (int num = min_num_points; num < max_num_points; num++)
{
- for (int i = 0; i < NUM_SIDES; i++)
+ // Track spline indices directly alongside points so that the
+ // measurement loop below can use iterator arithmetic instead of
+ // calling std::find(spline_lines[i]...) for every segment boundary.
+ // Without this, each call is O(S) and the outer num-loop makes the
+ // full function O(max_num_points * num * S) ≈ O(S²) per side.
+ vector<vector<int> > seg_indices(NUM_SIDES);
+ for (int i = 0; i < NUM_SIDES; i++)
{
segments_points[i].clear();
+ seg_indices[i].clear();
int size = (int)spline_lines[i].size();
float step = static_cast<float>(size) / num;
for (int j = 0; j < num; j++)
{
float val = j * step;
int idx = cvRound(val) >= size ? size - 1 : cvRound(val);
segments_points[i].push_back(spline_lines[i][idx]);
+ seg_indices[i].push_back(idx);
}
segments_points[i].push_back(spline_lines[i].back());
+ seg_indices[i].push_back((int)spline_lines[i].size() - 1);
}
float mean_of_two_sides = 0.0;
for (int i = 0; i < NUM_SIDES; i++)
{
float mean_dist_in_segment = 0.0;
for (size_t j = 0; j < segments_points[i].size() - 1; j++)
{
Point2f segment_start = segments_points[i][j];
Point2f segment_end = segments_points[i][j + 1];
- vector<Point2f>::iterator it_start, it_end, it;
- it_start = std::find(spline_lines[i].begin(), spline_lines[i].end(), segment_start);
- it_end = std::find(spline_lines[i].begin(), spline_lines[i].end(), segment_end);
+ // Use pre-recorded indices: O(1) instead of O(S) std::find.
+ vector<Point2f>::iterator it_start = spline_lines[i].begin() + seg_indices[i][j];
+ vector<Point2f>::iterator it_end = spline_lines[i].begin() + seg_indices[i][j + 1];
+ vector<Point2f>::iterator it;
float max_dist_to_line = 0.0;
for (it = it_start; it != it_end; it++)
{

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@ -0,0 +1,178 @@
import java.util.*;
/**
* Unit test for opencv-0001: QRDecode::divideIntoEvenSegments spline O(S²) defect.
*
* The defect: inside a loop over `num` (1..S/2) the function builds segment
* boundary points from spline_lines[i][idx] but then re-discovers those
* indices with std::find(spline_lines[i]...) an O(S) scan per segment
* boundary. Total cost becomes O(S² * NUM_SIDES).
*
* The fix: record `idx` alongside the point so the measurement loop uses
* iterator + idx instead of std::find.
*
* This Java simulation models the two strategies and measures the operation
* count ratio to confirm the asymptotic difference.
*/
public class OpenCVTest {
// Simulate "spline line" as a list of float pairs (x,y)
static class Point2f {
float x, y;
Point2f(float x, float y) { this.x = x; this.y = y; }
@Override public boolean equals(Object o) {
if (!(o instanceof Point2f)) return false;
Point2f p = (Point2f) o;
return Float.compare(p.x, x) == 0 && Float.compare(p.y, y) == 0;
}
@Override public int hashCode() {
return Objects.hash(x, y);
}
}
/** Build a synthetic spline of length S. */
static List<Point2f> makeSpline(int S) {
List<Point2f> line = new ArrayList<>(S);
for (int i = 0; i < S; i++) {
line.add(new Point2f(i, (float)Math.sin(i * 0.1)));
}
return line;
}
/**
* DEFECTIVE: for each (num, side, segment) pair call List.indexOf() (= std::find)
* to locate the boundary point. Returns total operation count.
*/
static long defective(List<Point2f> spline, int maxNum) {
int S = spline.size();
long ops = 0;
List<Point2f> segPoints = new ArrayList<>();
for (int num = 1; num < maxNum; num++) {
segPoints.clear();
float step = (float) S / num;
for (int j = 0; j < num; j++) {
float val = j * step;
int idx = Math.round(val) >= S ? S - 1 : Math.round(val);
segPoints.add(spline.get(idx));
}
segPoints.add(spline.get(S - 1));
// Measurement: std::find equivalent for each boundary pair
for (int j = 0; j < segPoints.size() - 1; j++) {
Point2f start = segPoints.get(j);
Point2f end = segPoints.get(j + 1);
// O(S) scan each the defect
int idxStart = spline.indexOf(start); ops += idxStart + 1;
int idxEnd = spline.indexOf(end); ops += idxEnd + 1;
}
}
return ops;
}
/**
* FIXED: record indices alongside points; use direct index access.
* Returns total operation count.
*/
static long fixed(List<Point2f> spline, int maxNum) {
int S = spline.size();
long ops = 0;
List<Point2f> segPoints = new ArrayList<>();
List<Integer> segIdx = new ArrayList<>();
for (int num = 1; num < maxNum; num++) {
segPoints.clear(); segIdx.clear();
float step = (float) S / num;
for (int j = 0; j < num; j++) {
float val = j * step;
int idx = Math.round(val) >= S ? S - 1 : Math.round(val);
segPoints.add(spline.get(idx));
segIdx.add(idx);
}
segPoints.add(spline.get(S - 1));
segIdx.add(S - 1);
// Measurement: use recorded index O(1)
for (int j = 0; j < segPoints.size() - 1; j++) {
int idxStart = segIdx.get(j); ops += 1; // O(1) access
int idxEnd = segIdx.get(j + 1); ops += 1;
}
}
return ops;
}
public static void main(String[] args) {
System.out.println("opencv-0001: QRDecode::divideIntoEvenSegments O(S²) defect");
System.out.println("=============================================================");
int[] sizes = {50, 100, 200, 500};
boolean allPass = true;
for (int S : sizes) {
List<Point2f> spline = makeSpline(S);
int maxNum = S / 2;
long defOps = defective(spline, maxNum);
long fixOps = fixed(spline, maxNum);
double ratio = (double) defOps / fixOps;
System.out.printf("S=%4d maxNum=%3d defect_ops=%,12d fixed_ops=%,8d ratio=%.1fx%n",
S, maxNum, defOps, fixOps, ratio);
// Expect defect to be significantly worse (at least 10x at S=50)
if (ratio < 5.0) {
System.err.println(" FAIL: expected ratio >= 5.0 at S=" + S);
allPass = false;
}
}
// Verify correctness: both should cover same index ranges
{
int S = 100; int maxNum = 50;
List<Point2f> spline = makeSpline(S);
List<Integer> defIndices = new ArrayList<>();
List<Integer> fixIndices = new ArrayList<>();
// Run defective and collect start indices for num=10
{
List<Point2f> seg = new ArrayList<>();
float step = (float) S / 10;
for (int j = 0; j < 10; j++) {
float val = j * step;
int idx = Math.round(val) >= S ? S-1 : Math.round(val);
seg.add(spline.get(idx));
}
seg.add(spline.get(S - 1));
for (int j = 0; j < seg.size() - 1; j++) {
defIndices.add(spline.indexOf(seg.get(j)));
}
}
// Fixed version
{
List<Integer> si = new ArrayList<>();
float step = (float) S / 10;
for (int j = 0; j < 10; j++) {
float val = j * step;
int idx = Math.round(val) >= S ? S-1 : Math.round(val);
si.add(idx);
}
si.add(S - 1);
for (int j = 0; j < si.size() - 1; j++) {
fixIndices.add(si.get(j));
}
}
if (!defIndices.equals(fixIndices)) {
System.err.println(" FAIL: defect and fix produced different indices");
allPass = false;
} else {
System.out.println("Correctness check: PASS (indices match)");
}
}
if (allPass) {
System.out.println("ALL TESTS PASS");
System.exit(0);
} else {
System.out.println("SOME TESTS FAILED");
System.exit(1);
}
}
}

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@ -0,0 +1,75 @@
# UNDF: (leave blank)
--- a/rules/group.go
+++ b/rules/group.go
@@ -1083,6 +1083,17 @@ func (m dependencyMap) dependents(r Rule) []Rule {
// dependencyMap maps a Rule to the slice of rules that depend on it (its "dependents").
type dependencyMap map[Rule][]Rule
+// inverseDependencyMap is the reverse index: maps a Rule to the set of rules it depends on
+// (i.e. its "dependencies"). Built alongside dependencyMap so that dependencies() is O(1)
+// instead of O(R×D) — a linear scan over the full map that makes AnalyseRules O(R²).
+type inverseDependencyMap map[Rule][]Rule
+
+// buildInverseMap creates an inverseDependencyMap from a dependencyMap.
+// Cost: O(R×D), paid once at buildDependencyMap time instead of O(R) times in AnalyseRules.
+func buildInverseMap(forward dependencyMap) inverseDependencyMap {
+ inv := make(inverseDependencyMap, len(forward))
+ for rule, dependents := range forward {
+ for _, dep := range dependents {
+ inv[dep] = append(inv[dep], rule)
+ }
+ }
+ return inv
+}
+
// dependents returns the rules which use the output of the given rule as one of their inputs.
func (m dependencyMap) dependents(r Rule) []Rule {
return m[r]
@@ -1090,14 +1101,12 @@ func (m dependencyMap) dependents(r Rule) []Rule {
// dependencies returns the rules on which the given rule is dependent for input.
-func (m dependencyMap) dependencies(r Rule) []Rule {
+func (m dependencyMap) dependencies(r Rule, inv inverseDependencyMap) []Rule {
if len(m) == 0 {
return []Rule{}
}
- var dependencies []Rule
- for rule, dependents := range m {
- // O(R×D): scans every entry in the map, then slices.Contains on dependents.
- if slices.Contains(dependents, r) {
- dependencies = append(dependencies, rule)
- }
- }
-
- return dependencies
+ // O(1): direct map lookup into the pre-built inverse index.
+ return inv[r]
}
// isIndependent determines whether the given rule is not dependent on another rule for its input, nor is any other rule
// dependent on its output.
-func (m dependencyMap) isIndependent(r Rule) bool {
+func (m dependencyMap) isIndependent(r Rule, inv inverseDependencyMap) bool {
if m == nil {
return false
}
- return len(m.dependents(r)) == 0 && len(m.dependencies(r)) == 0
+ return len(m.dependents(r)) == 0 && len(m.dependencies(r, inv)) == 0
}
--- a/rules/manager.go
+++ b/rules/manager.go
@@ -505,8 +505,11 @@ func (ruleDependencyController) AnalyseRules(rules []Rule) {
if depMap == nil {
return
}
+ // Build the inverse map once — O(R×D) — to make per-rule dependencies() calls O(1).
+ inv := buildInverseMap(depMap)
+
for _, r := range rules {
r.SetDependentRules(depMap.dependents(r))
- r.SetDependencyRules(depMap.dependencies(r))
+ r.SetDependencyRules(depMap.dependencies(r, inv))
}
}

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@ -1,95 +1,176 @@
package unit;
import java.util.*;
/**
* Standalone unit test for prometheus-0001: CWE-407.
* Unit test for prometheus-0001: dependencyMap.dependencies() O(R²) defect.
*
* prometheus-0001: Builder.Labels() del-slice membership O(n²)
* slow() uses a List<String> for the "deleted" set; contains() is O(D).
* For each of L base labels: O(D) del-check + O(A) add-check O(L×(D+A)).
* fast() uses a HashSet<String> for both del and add; contains() is O(1).
* For each of L base labels: O(1) del-check + O(1) add-check O(L).
* Assert: slowOps > fastOps * 10x for L=500 labels with D=250 deleted.
* The defect: AnalyseRules() calls dependencies(r) for each of R rules.
* dependencies() iterates all entries in the dependency map (R entries) and for
* each calls slices.Contains(dependents, r) an O(D) linear scan of the
* dependents slice. Total cost: O(R × R × D) O(R²) for sparse graphs.
*
* The fix: build an inverse map (rule rules it depends on) once in O(R×D),
* then each dependencies() call is a single O(1) map lookup.
*
* This Java simulation models the two strategies, counts operations, and
* confirms the asymptotic ratio grows with the number of rules R.
*/
public class PrometheusTest {
// Simulate a Rule as a simple integer ID.
static class Rule {
final int id;
Rule(int id) { this.id = id; }
@Override public boolean equals(Object o) {
return o instanceof Rule && ((Rule)o).id == id;
}
@Override public int hashCode() { return Integer.hashCode(id); }
@Override public String toString() { return "Rule(" + id + ")"; }
}
// dependencyMap: rule -> list of rules that depend on it (its "dependents")
static Map<Rule, List<Rule>> buildForwardMap(List<Rule> rules, int branchFactor) {
Map<Rule, List<Rule>> fwd = new IdentityHashMap<>();
for (int i = 0; i < rules.size(); i++) {
Rule rule = rules.get(i);
List<Rule> dependents = new ArrayList<>();
// Simulate: each rule is a dependent of the previous `branchFactor` rules
for (int b = 1; b <= branchFactor && i + b < rules.size(); b++) {
dependents.add(rules.get(i + b));
}
if (!dependents.isEmpty()) {
fwd.put(rule, dependents);
}
}
return fwd;
}
/**
* Slow path Builder.Labels() with []string del-set: O(L * D) membership tests.
* DEFECTIVE dependencies(): scan all forward-map entries for r in dependents.
* Returns total operation count (each slices.Contains step = 1 op).
*/
static long slowBuilderLabels(List<String> base, List<String> del, List<String> add) {
static long defectiveDependencies(Rule r, Map<Rule, List<Rule>> fwd) {
long ops = 0;
List<String> result = new ArrayList<>(base.size());
for (String label : base) {
// slices.Contains(del, label) O(D) linear scan
boolean inDel = false;
for (String d : del) {
List<Rule> result = new ArrayList<>();
for (Map.Entry<Rule, List<Rule>> e : fwd.entrySet()) {
List<Rule> dependents = e.getValue();
for (Rule dep : dependents) { // simulates slices.Contains
ops++;
if (d.equals(label)) { inDel = true; break; }
if (dep.equals(r)) {
result.add(e.getKey());
break;
}
}
if (inDel) continue;
// contains(add, label) O(A) linear scan
boolean inAdd = false;
for (String a : add) {
ops++;
if (a.equals(label)) { inAdd = true; break; }
}
if (inAdd) continue;
result.add(label);
}
return ops;
}
/**
* Fast path Builder.Labels() with map-based del/add sets: O(L) total.
* FIXED dependencies(): O(1) map lookup into pre-built inverse map.
*/
static long fastBuilderLabels(List<String> base, List<String> del, List<String> add) {
long ops = 0;
// Build O(1) sets cost O(D + A)
Set<String> delSet = new HashSet<>(del);
for (String ignored : del) ops++;
Set<String> addSet = new HashSet<>(add);
for (String ignored : add) ops++;
List<String> result = new ArrayList<>(base.size());
for (String label : base) {
ops++; // single O(1) hash lookup
if (delSet.contains(label)) continue;
ops++;
if (addSet.contains(label)) continue;
result.add(label);
}
static long fixedDependencies(Rule r, Map<Rule, List<Rule>> inv) {
long ops = 1; // single map lookup
inv.get(r); // O(1)
return ops;
}
static void testBuilderLabels() {
int L = 500; // base label count
int D = 250; // deleted label count (worst case: half of base)
int A = 50; // added label count
/** Build inverse map: O(R*D). */
static Map<Rule, List<Rule>> buildInverseMap(Map<Rule, List<Rule>> fwd) {
Map<Rule, List<Rule>> inv = new IdentityHashMap<>();
for (Map.Entry<Rule, List<Rule>> e : fwd.entrySet()) {
for (Rule dep : e.getValue()) {
inv.computeIfAbsent(dep, k -> new ArrayList<>()).add(e.getKey());
}
}
return inv;
}
List<String> base = new ArrayList<>(L);
for (int i = 0; i < L; i++) base.add("label_" + i);
/** Simulate AnalyseRules over R rules. */
static long runDefective(List<Rule> rules, Map<Rule, List<Rule>> fwd) {
long totalOps = 0;
for (Rule r : rules) {
totalOps += defectiveDependencies(r, fwd);
}
return totalOps;
}
List<String> del = new ArrayList<>(D);
for (int i = 0; i < D; i++) del.add("label_" + i); // delete first D
List<String> add = new ArrayList<>(A);
for (int i = 0; i < A; i++) add.add("new_label_" + i);
long sOps = slowBuilderLabels(base, del, add);
long fOps = fastBuilderLabels(base, del, add);
int Nx = 10;
boolean pass = sOps > fOps * Nx;
System.out.printf("prometheus-0001 [L=%d D=%d A=%d]: slow=%d fast=%d ratio=%.1fx — %s%n",
L, D, A, sOps, fOps, (double) sOps / fOps, pass ? "PASS" : "FAIL");
if (!pass) throw new AssertionError("prometheus-0001 FAIL: slow=" + sOps + " fast=" + fOps);
static long runFixed(List<Rule> rules, Map<Rule, List<Rule>> fwd) {
long totalOps = 0;
// Build inverse map once
Map<Rule, List<Rule>> inv = buildInverseMap(fwd);
// O(R*D) build cost counted separately
for (Rule r : rules) {
totalOps += fixedDependencies(r, inv);
}
return totalOps;
}
public static void main(String[] args) {
testBuilderLabels();
System.out.println("1/1 PASS");
System.out.println("prometheus-0001: dependencyMap.dependencies() O(R²) defect");
System.out.println("===========================================================");
int[] ruleCounts = {10, 50, 100, 200, 500};
int branchFactor = 3; // each rule depends on 3 next rules
boolean allPass = true;
for (int R : ruleCounts) {
List<Rule> rules = new ArrayList<>(R);
for (int i = 0; i < R; i++) rules.add(new Rule(i));
Map<Rule, List<Rule>> fwd = buildForwardMap(rules, branchFactor);
long defOps = runDefective(rules, fwd);
long fixOps = runFixed(rules, fwd);
double ratio = (double) defOps / Math.max(fixOps, 1);
System.out.printf("R=%4d branchFactor=%d defect_ops=%,8d fixed_ops=%,6d ratio=%.1fx%n",
R, branchFactor, defOps, fixOps, ratio);
if (ratio < 3.0) {
System.err.println(" FAIL: expected ratio >= 3.0 at R=" + R);
allPass = false;
}
}
// Correctness: fixed produces same dependencies as defective
{
int R = 20;
List<Rule> rules = new ArrayList<>(R);
for (int i = 0; i < R; i++) rules.add(new Rule(i));
Map<Rule, List<Rule>> fwd = buildForwardMap(rules, 2);
Map<Rule, List<Rule>> inv = buildInverseMap(fwd);
boolean correct = true;
for (Rule r : rules) {
// Collect via defective
List<Rule> defDeps = new ArrayList<>();
for (Map.Entry<Rule, List<Rule>> e : fwd.entrySet()) {
if (e.getValue().contains(r)) defDeps.add(e.getKey());
}
// Collect via fixed
List<Rule> fixDeps = inv.getOrDefault(r, Collections.emptyList());
Set<Integer> defIds = new HashSet<>();
for (Rule d : defDeps) defIds.add(d.id);
Set<Integer> fixIds = new HashSet<>();
for (Rule d : fixDeps) fixIds.add(d.id);
if (!defIds.equals(fixIds)) {
System.err.println(" FAIL: mismatch for " + r + " defective=" + defIds + " fixed=" + fixIds);
correct = false;
allPass = false;
}
}
if (correct) {
System.out.println("Correctness check: PASS (dependency sets match)");
}
}
if (allPass) {
System.out.println("ALL TESTS PASS");
System.exit(0);
} else {
System.out.println("SOME TESTS FAILED");
System.exit(1);
}
}
}