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harden retrieve logic

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team 1
2026-04-17 14:52:53 +02:00
parent ae2b52ad18
commit 5c9d81adeb
4 changed files with 838 additions and 141 deletions
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491
src/Knowledge/Retrieval/NdjsonHybridRetriever.php
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@@ -23,6 +23,7 @@ use RuntimeException;
* Main responsibilities:
* - detect high-level request intent
* - optionally short-circuit to catalog list output
* - resolve exact document-title matches before semantic retrieval
* - run vector retrieval globally and optionally document-scoped
* - fuse both result sets with RRF-style scoring
* - apply selection rules for list queries vs. sales-style queries
@@ -30,6 +31,15 @@ use RuntimeException;
*/
final readonly class NdjsonHybridRetriever implements RetrieverInterface
{
/**
* When one document clearly dominates the top-ranked window,
* temporarily switch from "spread" mode to "dominant document" mode.
*/
private const DOMINANT_DOC_WINDOW = 6;
private const DOMINANT_DOC_MIN_HITS = 3;
private const DOMINANT_DOC_MAX_CHUNKS = 4;
private const EXACT_DOCUMENT_MAX_CHUNKS = 6;
public function __construct(
private NdjsonChunkLookup $lookup,
private VectorSearchClient $vectorClient,
@@ -58,6 +68,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
* - executes the full orchestration pipeline
* - if the route resolves to a catalog list, returns the catalog block only
* - otherwise returns the selected chunk texts
*
* @throws Exception
*/
public function retrieve(string $prompt): array
@@ -65,12 +76,10 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$config = $this->requireConfig();
$result = $this->execute($prompt, $config, false);
// Catalog list responses bypass normal chunk retrieval completely.
if ($result['catalogBlock'] !== null) {
return [$result['catalogBlock']];
}
// No selected chunks means no usable retrieval result.
if ($result['selectedChunkIds'] === []) {
return [];
}
@@ -90,6 +99,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
* - fused RRF scores
* - intent / route information
* - threshold and list-query flags
*
* @throws Exception
*/
public function retrieveDebug(string $prompt, ?ModelGenerationConfig $config = null): array
@@ -97,12 +107,12 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$config = $config ?? $this->requireConfig();
$result = $this->execute($prompt, $config, true);
// For catalog list routes we expose a synthetic debug row.
if ($result['catalogBlock'] !== null) {
return [[
'rank' => 1,
'chunk_id' => '__CATALOG_LIST__',
'document_id' => null,
'chunk_index' => null,
'raw_score' => null,
'rrf_score' => null,
'threshold' => 0.0,
@@ -110,6 +120,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
'route' => $result['route'],
'entity_label' => $result['entityLabel'],
'is_list_query' => true,
'selection_mode' => 'catalog_list',
'text' => $result['catalogBlock'],
]];
}
@@ -122,8 +133,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$rank = 0;
foreach ($result['selectedChunkIds'] as $chunkId) {
// Skip ids that could not be resolved to real chunk rows.
if (!isset($result['rows'][$chunkId])) {
continue;
}
@@ -134,6 +143,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
'rank' => $rank,
'chunk_id' => $chunkId,
'document_id' => $result['rows'][$chunkId]['document_id'] ?? null,
'chunk_index' => $result['rows'][$chunkId]['chunk_index'] ?? null,
'raw_score' => $result['rawScores'][$chunkId] ?? null,
'rrf_score' => $result['rrfScores'][$chunkId] ?? null,
'threshold' => $result['threshold'],
@@ -141,6 +151,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
'route' => $result['route'],
'entity_label' => $result['entityLabel'],
'is_list_query' => $result['isListQuery'],
'selection_mode' => $result['selectionMode'],
'text' => trim((string)$result['rows'][$chunkId]['text']),
];
}
@@ -159,8 +170,10 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
* 1. Detect catalog entity and sales intent
* 2. Resolve route
* 3. If route is a catalog list route, try direct catalog output
* 4. Otherwise, run the normal hybrid retrieval core
* 5. Select final chunk ids depending on query type
* 4. If prompt matches one exact document title, use exact-document fast path
* 5. Otherwise, run the normal hybrid retrieval core
* 6. Select final chunk ids depending on query type
*
* @throws Exception
*/
private function execute(
@@ -169,16 +182,11 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
bool $withScores
): array
{
$entityLabel = $this->catalogIntent->detect($prompt);
$salesIntent = $this->detectSalesIntent($prompt);
$route = $this->routeResolver->resolve($salesIntent, $entityLabel);
// Fast path:
// If the route explicitly asks for a catalog list and we have an entity label,
// we return a prebuilt catalog block instead of semantic chunk retrieval.
if ($route === IntentRouteResolver::ROUTE_CATALOG_LIST && $entityLabel !== null) {
$catalogBlock = $this->entityCatalogService->listByTerm($entityLabel);
if ($catalogBlock !== null) {
@@ -187,6 +195,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
'entityLabel' => $entityLabel,
'intent' => $salesIntent,
'isListQuery' => true,
'selectionMode' => 'catalog_list',
'selectedChunkIds' => [],
'rows' => [],
'rrfScores' => [],
@@ -197,15 +206,40 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
}
}
$exactDocumentMatch = $this->lookup->findBestExactDocumentByPrompt($prompt);
if ($exactDocumentMatch !== null) {
$selectedChunkIds = $this->selectExactDocumentChunkIds(
$exactDocumentMatch['rows'],
max(1, min($config->getRetrievalMaxChunks(), NdjsonHybridRetrieverConfig::HARD_MAX_CHUNKS))
);
if ($selectedChunkIds !== []) {
return [
'route' => $route,
'entityLabel' => $entityLabel,
'intent' => $salesIntent,
'isListQuery' => false,
'selectionMode' => 'exact_document_title',
'selectedChunkIds' => $selectedChunkIds,
'rows' => $exactDocumentMatch['rows'],
'rrfScores' => $this->buildExactDocumentScores($selectedChunkIds),
'rawScores' => [],
'threshold' => 1.0,
'catalogBlock' => null,
];
}
}
$core = $this->runCore($prompt, $config, $withScores, $salesIntent);
// No ranked chunks or no resolved rows means retrieval produced nothing usable.
if ($core['ranked_chunk_ids'] === [] || $core['rows'] === []) {
return [
'route' => $route,
'entityLabel' => $entityLabel,
'intent' => $salesIntent,
'isListQuery' => $core['is_list_query'],
'selectionMode' => null,
'selectedChunkIds' => [],
'rows' => [],
'rrfScores' => [],
@@ -215,18 +249,30 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
];
}
// Selection strategy depends on query type:
// - list queries prefer deduplicated chunks
// - sales queries prefer spread across docs / chunk distance
$selectedChunkIds = $core['is_list_query']
? $this->selectListChunkIds($core['ranked_chunk_ids'], $core['rows'], $core['limit'])
: $this->selectSalesChunkIds($core['ranked_chunk_ids'], $core['rows'], $core['limit']);
if ($core['is_list_query']) {
$selectedChunkIds = $this->selectListChunkIds(
$core['ranked_chunk_ids'],
$core['rows'],
$core['limit']
);
$selectionMode = 'list_deduplicated';
} else {
$salesSelection = $this->selectSalesChunkIds(
$core['ranked_chunk_ids'],
$core['rows'],
$core['limit']
);
$selectedChunkIds = $salesSelection['ids'];
$selectionMode = $salesSelection['mode'];
}
return [
'route' => $route,
'entityLabel' => $entityLabel,
'intent' => $salesIntent,
'isListQuery' => $core['is_list_query'],
'selectionMode' => $selectionMode,
'selectedChunkIds' => $selectedChunkIds,
'rows' => $core['rows'],
'rrfScores' => $core['rrf_scores'],
@@ -252,6 +298,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
* - run global and optional scoped vector search
* - fuse hits
* - resolve chunk ids to chunk rows
*
* @throws Exception
*/
private function runCore(
@@ -261,17 +308,14 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
string $salesIntent
): array
{
$limit = max(1, min($config->getRetrievalMaxChunks(), NdjsonHybridRetrieverConfig::HARD_MAX_CHUNKS));
$vectorTopKBase = max(1, min($config->getRetrievalVectorTopK(), NdjsonHybridRetrieverConfig::HARD_MAX_VECTORK));
$isListQuery = $this->intentLite->isListQuery($prompt);
// The prompt is normalized first, then enriched before retrieval.
$cleanQuery = $this->queryCleaner->clean($prompt);
$cleanQuery = $this->queryEnricher->enrichPrompt($cleanQuery);
// Empty cleaned query means retrieval would be meaningless.
if ($cleanQuery === '') {
return [
'limit' => $limit,
@@ -290,22 +334,21 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$vectorTopKBase
);
// Tag routing tries to narrow retrieval to relevant document ids.
$candidateDocIds = $this->tagRouting->route($cleanQuery);
$candidateDocIds = is_array($candidateDocIds)
? array_values(array_unique(array_filter($candidateDocIds, 'is_string')))
? array_values(array_unique(array_filter(
$candidateDocIds,
static fn(mixed $value): bool => is_string($value) && $value !== ''
)))
: [];
// Always run a global search.
$globalHits = $this->vectorClient->search($cleanQuery, $topK);
// Optionally run a scoped search if tag routing yielded document candidates.
$scopedHits = [];
if ($candidateDocIds !== []) {
$scopedHits = $this->vectorClient->searchScoped($cleanQuery, $topK, $candidateDocIds);
}
// Nothing found at all.
if ($globalHits === [] && $scopedHits === []) {
return [
'limit' => $limit,
@@ -318,25 +361,19 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
];
}
// Fuse global and scoped hits with optional scoped boost.
$fused = $this->fuseHits(
$globalHits,
$scopedHits,
$threshold,
$salesIntent === SalesIntentLite::OBJECTION,
$scopedHits !== [],
$withScores
);
$rrfScores = $fused['rrf_scores'];
$rawScores = $fused['raw_scores'];
// Fallback:
// If all hits were filtered by threshold but global hits exist,
// derive a weak RRF ranking from the raw hit order.
if ($rrfScores === [] && $globalHits !== []) {
$rrfScores = $this->fallbackRrfFromHits(
$globalHits
);
$rrfScores = $this->fallbackRrfFromHits($globalHits);
}
if ($rrfScores === []) {
@@ -351,11 +388,9 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
];
}
// Highest fused score first.
arsort($rrfScores);
$rankedChunkIds = array_keys($rrfScores);
// Resolve the ranking to actual NDJSON chunk rows.
$rows = $this->lookup->findByChunkIds($rankedChunkIds);
return [
@@ -381,9 +416,11 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
private function requireConfig(): ModelGenerationConfig
{
$config = $this->configRepository->findActiveForModel();
if ($config === null) {
throw new RuntimeException('No active ModelGenerationConfig found.');
}
return $config;
}
@@ -395,6 +432,7 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
private function detectSalesIntent(string $prompt): string
{
$data = $this->salesIntentLite->detect($prompt);
return (string)($data['intent'] ?? SalesIntentLite::DISCOVERY);
}
@@ -412,7 +450,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
int $vectorTopKBase
): array
{
$threshold = NdjsonHybridRetrieverConfig::VECTOR_SCORE_THRESHOLD;
$topK = $vectorTopKBase;
@@ -428,7 +465,10 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
}
$topK = max(1, min($topK, NdjsonHybridRetrieverConfig::HARD_MAX_VECTORK));
$threshold = max(NdjsonHybridRetrieverConfig::THRESHOLD_FLOOR, min(NdjsonHybridRetrieverConfig::THRESHOLD_CEIL, $threshold));
$threshold = max(
NdjsonHybridRetrieverConfig::THRESHOLD_FLOOR,
min(NdjsonHybridRetrieverConfig::THRESHOLD_CEIL, $threshold)
);
return [$threshold, $topK];
}
@@ -450,31 +490,25 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
bool $captureRaw
): array
{
$rrfScores = [];
$rawScores = [];
$apply = function (array $hits, bool $boost) use (&$rrfScores, &$rawScores, $threshold, $captureRaw): void {
$rank = 0;
foreach ($hits as $hit) {
// Every hit must provide a chunk id and a numeric score.
if (!isset($hit['chunk_id'], $hit['score'])) {
continue;
}
$raw = (float)$hit['score'];
// Threshold is applied before rank fusion.
if ($raw < $threshold) {
continue;
}
$chunkId = (string)$hit['chunk_id'];
// Store the best raw score per chunk for debug inspection.
if ($captureRaw) {
$rawScores[$chunkId] = max($rawScores[$chunkId] ?? 0.0, $raw);
}
@@ -482,12 +516,10 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$rank++;
$rrf = 1.0 / (NdjsonHybridRetrieverConfig::RRF_K + $rank);
// Scoped result lists can get a slight relevance bonus.
if ($boost) {
$rrf *= 1.2;
}
// Scores from multiple hit lists accumulate.
$rrfScores[$chunkId] = ($rrfScores[$chunkId] ?? 0.0) + $rrf;
}
};
@@ -513,7 +545,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$rank = 0;
foreach ($hits as $hit) {
if (!isset($hit['chunk_id'])) {
continue;
}
@@ -529,6 +560,68 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
return $rrf;
}
/**
* Selects a coherent chunk window from one exact document title match.
*
* For exact product questions we prefer a pure document slice over
* cross-document fusion to avoid mixing neighbouring product families.
*
* @param array<string,array<string,mixed>> $rows
* @return string[]
*/
private function selectExactDocumentChunkIds(array $rows, int $limit): array
{
uasort($rows, static function (array $a, array $b): int {
$aIndex = is_int($a['chunk_index'] ?? null) ? (int)$a['chunk_index'] : PHP_INT_MAX;
$bIndex = is_int($b['chunk_index'] ?? null) ? (int)$b['chunk_index'] : PHP_INT_MAX;
if ($aIndex !== $bIndex) {
return $aIndex <=> $bIndex;
}
return strcmp((string)($a['chunk_id'] ?? ''), (string)($b['chunk_id'] ?? ''));
});
$selected = [];
$max = min($limit, self::EXACT_DOCUMENT_MAX_CHUNKS);
foreach ($rows as $row) {
$chunkId = $row['chunk_id'] ?? null;
$text = trim((string)($row['text'] ?? ''));
if (!is_string($chunkId) || $chunkId === '' || $text === '') {
continue;
}
$selected[] = $chunkId;
if (count($selected) >= $max) {
break;
}
}
return $selected;
}
/**
* Builds synthetic scores for exact-title fast-path selections.
*
* These scores are only used for debug output consistency.
*
* @param string[] $chunkIds
* @return array<string,float>
*/
private function buildExactDocumentScores(array $chunkIds): array
{
$scores = [];
foreach (array_values($chunkIds) as $rank => $chunkId) {
$scores[(string)$chunkId] = 1.0 / (1 + $rank);
}
return $scores;
}
/**
* Selection strategy for list-style queries.
*
@@ -543,7 +636,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$out = [];
foreach ($chunkIds as $id) {
if (!isset($rows[$id]['text'])) {
continue;
}
@@ -553,7 +645,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
continue;
}
// Deduplicate by normalized chunk text.
$key = md5(mb_strtolower((string)preg_replace('/\s+/u', ' ', $chunk)));
if (isset($seen[$key])) {
@@ -574,18 +665,242 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
/**
* Selection strategy for sales-oriented queries.
*
* Goal:
* - avoid overloading the result with chunks from the same document
* - avoid chunks that are too close to each other in the same document
* - preserve top-ranked relevance while improving contextual spread
* Modes:
* - exact_document_title:
* used when the prompt clearly contains one exact document title
* and the answer should stay strictly within that document
*
* - sales_dominant_document:
* used when one document clearly dominates the top hit window
* and coherent neighbouring chunks from that document are more
* useful than cross-document spread
*
* - sales_spread:
* default mode that spreads chunks across documents and enforces
* distance between chunk positions of the same document
*/
private function selectSalesChunkIds(array $chunkIds, array $rows, int $limit): array
{
$out = [];
$dominantDocId = $this->detectDominantTopDocument($chunkIds, $rows);
if ($dominantDocId !== null) {
$dominantChunkIds = $this->selectDominantDocumentChunkIds(
$dominantDocId,
$chunkIds,
$rows,
$limit
);
if ($dominantChunkIds !== []) {
return [
'ids' => $this->fillRemainingSalesChunkIds(
$dominantChunkIds,
$chunkIds,
$rows,
$limit
),
'mode' => 'sales_dominant_document',
];
}
}
return [
'ids' => $this->selectSalesChunkIdsSpread($chunkIds, $rows, $limit),
'mode' => 'sales_spread',
];
}
/**
* Detects whether one document clearly dominates the first ranked window.
*
* This is especially useful for product-sheet style documents where
* several adjacent chunks belong together and should be passed to the model
* as one coherent factual block.
*/
private function detectDominantTopDocument(array $chunkIds, array $rows): ?string
{
$docWindow = [];
foreach (array_slice($chunkIds, 0, self::DOMINANT_DOC_WINDOW) as $chunkId) {
if (!isset($rows[$chunkId]['text'])) {
continue;
}
$text = trim((string)$rows[$chunkId]['text']);
$docId = $rows[$chunkId]['document_id'] ?? null;
if ($text === '' || !is_string($docId) || $docId === '') {
continue;
}
$docWindow[] = $docId;
}
if (count($docWindow) < 2) {
return null;
}
$counts = array_count_values($docWindow);
arsort($counts);
$dominantDocId = array_key_first($counts);
if (!is_string($dominantDocId) || $dominantDocId === '') {
return null;
}
$dominantCount = (int)($counts[$dominantDocId] ?? 0);
if ($dominantCount >= self::DOMINANT_DOC_MIN_HITS) {
return $dominantDocId;
}
$first = $docWindow[0] ?? null;
$second = $docWindow[1] ?? null;
if ($dominantCount >= 2 && $first === $dominantDocId && $second === $dominantDocId) {
return $dominantDocId;
}
return null;
}
/**
* Selects a coherent chunk window from the dominant document.
*
* Strategy:
* - use the highest-ranked chunk of that document as anchor
* - prefer neighbouring chunk indices around that anchor
* - sort the final selection by chunk index for prompt coherence
*/
private function selectDominantDocumentChunkIds(
string $documentId,
array $chunkIds,
array $rows,
int $limit
): array
{
$docHits = [];
$anchorChunkIndex = null;
foreach ($chunkIds as $rank => $chunkId) {
if (!isset($rows[$chunkId]['text'])) {
continue;
}
$text = trim((string)$rows[$chunkId]['text']);
$docId = $rows[$chunkId]['document_id'] ?? null;
if ($text === '' || $docId !== $documentId) {
continue;
}
$chunkIndex = $rows[$chunkId]['chunk_index'] ?? null;
$chunkIndex = is_int($chunkIndex) ? $chunkIndex : null;
if ($anchorChunkIndex === null && $chunkIndex !== null) {
$anchorChunkIndex = $chunkIndex;
}
$docHits[] = [
'id' => (string)$chunkId,
'rank' => $rank,
'chunk_index' => $chunkIndex,
];
}
if ($docHits === []) {
return [];
}
$maxFromDoc = min($limit, self::DOMINANT_DOC_MAX_CHUNKS);
if ($anchorChunkIndex !== null) {
usort($docHits, static function (array $a, array $b) use ($anchorChunkIndex): int {
$aDistance = $a['chunk_index'] === null ? PHP_INT_MAX : abs($a['chunk_index'] - $anchorChunkIndex);
$bDistance = $b['chunk_index'] === null ? PHP_INT_MAX : abs($b['chunk_index'] - $anchorChunkIndex);
if ($aDistance !== $bDistance) {
return $aDistance <=> $bDistance;
}
return $a['rank'] <=> $b['rank'];
});
} else {
usort($docHits, static fn(array $a, array $b): int => $a['rank'] <=> $b['rank']);
}
$selected = array_slice($docHits, 0, $maxFromDoc);
usort($selected, static function (array $a, array $b): int {
$aIndex = $a['chunk_index'];
$bIndex = $b['chunk_index'];
if ($aIndex === null && $bIndex === null) {
return $a['rank'] <=> $b['rank'];
}
if ($aIndex === null) {
return 1;
}
if ($bIndex === null) {
return -1;
}
if ($aIndex !== $bIndex) {
return $aIndex <=> $bIndex;
}
return $a['rank'] <=> $b['rank'];
});
return array_map(
static fn(array $row): string => $row['id'],
$selected
);
}
/**
* Fills the remaining sales slots after a dominant document selection.
*
* The already selected dominant-document chunks stay fixed.
* Remaining slots are filled with the normal spread strategy.
*/
private function fillRemainingSalesChunkIds(
array $seedChunkIds,
array $chunkIds,
array $rows,
int $limit
): array
{
$out = array_values(array_unique(array_map('strval', $seedChunkIds)));
if (count($out) >= $limit) {
return array_slice($out, 0, $limit);
}
$selected = array_fill_keys($out, true);
$docCounter = [];
$docChunkPositions = [];
foreach ($out as $chunkId) {
$docId = $rows[$chunkId]['document_id'] ?? null;
$chunkIndex = $rows[$chunkId]['chunk_index'] ?? null;
if (is_string($docId) && $docId !== '') {
$docCounter[$docId] = ($docCounter[$docId] ?? 0) + 1;
if (is_int($chunkIndex)) {
$docChunkPositions[$docId][] = $chunkIndex;
}
}
}
foreach ($chunkIds as $chunkId) {
if (isset($selected[$chunkId])) {
continue;
}
if (!isset($rows[$chunkId]['text'])) {
continue;
@@ -594,23 +909,80 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$docId = $rows[$chunkId]['document_id'] ?? null;
$chunkIndex = $rows[$chunkId]['chunk_index'] ?? null;
// Sales selection requires a valid document context.
if (!is_string($docId)) {
if (!is_string($docId) || $docId === '') {
continue;
}
// Limit how many chunks may come from the same document.
if (($docCounter[$docId] ?? 0) >= NdjsonHybridRetrieverConfig::MAX_CHUNKS_PER_DOC) {
continue;
}
// Enforce a minimum distance between chunk positions of the same document.
if (is_int($chunkIndex)) {
foreach ($docChunkPositions[$docId] ?? [] as $prevIdx) {
if (abs($prevIdx - $chunkIndex) < NdjsonHybridRetrieverConfig::MIN_CHUNK_DISTANCE) {
continue 2;
}
}
}
$text = trim((string)$rows[$chunkId]['text']);
if ($text === '') {
continue;
}
$out[] = (string)$chunkId;
$selected[$chunkId] = true;
$docCounter[$docId] = ($docCounter[$docId] ?? 0) + 1;
if (is_int($chunkIndex)) {
$docChunkPositions[$docId][] = $chunkIndex;
}
if (count($out) >= $limit) {
break;
}
}
return $out;
}
/**
* Default spread selection for sales-oriented queries.
*
* Goal:
* - avoid overloading the result with chunks from the same document
* - avoid chunks that are too close to each other in the same document
* - preserve top-ranked relevance while improving contextual spread
*/
private function selectSalesChunkIdsSpread(array $chunkIds, array $rows, int $limit): array
{
$out = [];
$docCounter = [];
$docChunkPositions = [];
foreach ($chunkIds as $chunkId) {
if (!isset($rows[$chunkId]['text'])) {
continue;
}
$docId = $rows[$chunkId]['document_id'] ?? null;
$chunkIndex = $rows[$chunkId]['chunk_index'] ?? null;
if (!is_string($docId) || $docId === '') {
continue;
}
if (($docCounter[$docId] ?? 0) >= NdjsonHybridRetrieverConfig::MAX_CHUNKS_PER_DOC) {
continue;
}
if (is_int($chunkIndex)) {
foreach ($docChunkPositions[$docId] ?? [] as $prevIdx) {
if (abs($prevIdx - $chunkIndex) < NdjsonHybridRetrieverConfig::MIN_CHUNK_DISTANCE) {
continue 2;
}
}
$docChunkPositions[$docId][] = $chunkIndex;
}
@@ -638,7 +1010,6 @@ final readonly class NdjsonHybridRetriever implements RetrieverInterface
$out = [];
foreach ($chunkIds as $id) {
if (!isset($rows[$id]['text'])) {
continue;
}