neo4j 向量索引

原创最新推荐文章于 2026-07-13 09:46:43 发布 2.4k 阅读 AI写同款

hellochenlian

码龄17年墨衍会员 · AI 创作全网分发

629粉丝295篇原创

关注

neo4j向量索引 neo4j向量索引，cypher原生命令创建阅读详情

AI摘要

本文介绍如何在Neo4j中使用向量索引进行高效的数据查询。通过具体示例展示了如何创建向量索引及查询相似节点的方法。

以下资源提供了在 Neo4j 中使用 LLM 和向量索引的实践教程：

Neo4j 向量索引由Apache Lucene索引和搜索库提供支持。 [ 1 ]

示例图

本页上的示例使用Neo4j 电影推荐数据集，重点关注节点的plot和属性。属性由和属性组合而成的 1536 维向量嵌入组成。embeddingMovieembeddingplottitle

该图包含 28863 个节点和 332522 个关系。

要重新创建图表，请下载此转储文件并将其导入空的 Neo4j 数据库（运行 5.13 或更高版本）。可以为Aura和本地实例导入转储文件。

用于加载数据集的转储文件包含使用模型由OpenAItext-embedding-ada-002生成的嵌入。

Neo4j 中的向量和嵌入

向量索引允许您从大型数据集中查询向量嵌入。嵌入是数据对象（例如文本、图像或文档）的数值表示。文本中的每个单词或标记通常表示为高维向量，其中每个维度代表单词含义的某个方面。

特定数据对象的嵌入可以由专有（例如Vertex AI或OpenAI）和开源（例如sentence-transformers）嵌入生成器创建，它们可以生成维度为 256、768、1536 和 3072 的向量嵌入。在 Neo4j 中，向量嵌入存储为LIST<INTEGER | FLOAT>节点或关系上的属性。

有关如何生成嵌入并将其存储为属性的信息，请参阅：

例如电影《教父》有以下内容plot："The aging patriarch of an organized crime dynasty transfers control of his clandestine empire to his reluctant son." 这是它的 1536 维embedding属性，其中每个元素LIST代表情节含义的某个特定方面：

[0.005967312026768923，-0.03817005082964897，0.0014667075593024492，-0.03868866711854935，-0.006505374796688557，0.02090017683 8040352, -0.0027551413513720036, -0.0024731445591896772, -0.03734026849269867, -0.02228747308254242, 0.028783122077584267, 0.017905177548527718、0.011396560817956924、0.014235977083444595、0.023143187165260315、-0.014184115454554558、0.0298462826 75862312, -0.011928141117095947, 0.018838683143258095, -0.0019172541797161102, 0.0033483069855719805, 0.009497134014964104, -0.03516208380460739、0.0021441481076180935、0.002657901030033827、0.0030760341323912144、0.004255882930010557、-0.020809419 453144073, 0.02358401007950306, -0.013808120042085648, 0.01064456906169653, -0.006975369527935982, 0.007318951655179262, -0.013872946612536907, 0.005905726458877325, -0.010689947754144669, 0.0020225979387760162, -0.016245609149336815, -0.000388150 77277831733, -0.007163367234170437, 0.027668101713061333, 0.007215228863060474, -0.009380445815622807, -0.02956104464828968, -0.000863007502630353、0.012142069637775421、0.0012957267463207245、-0.027953339740633965、-0.016414159908890724、0.008453421 294689178, -0.0010777463903650641, 0.03311355784535408, -0.013639570213854313, -0.052457891404628754, 0.0010242642601951957, 0.0034390646032989025、-0.01049546804279089、0.006456754636019468、0.003970644902437925、-0.011629937216639519、0.0052801473 06621075, -0.023402493447065353, -0.014689764939248562, -0.007623638026416302, -0.002453696448355913, 0.02290981076657772, 0.0017989451298490167, 0.0013427261728793383, -0.001776255783624947, -0.002414800226688385, 0.04833490028977394, 0.031142819 672822952, -0.0033013075590133667, 0.017879245802760124, 0.0070077828131616116, -0.016154851764440536, -0.005772831384092569, 0.019875913858413696、-0.018008900806307793、0.012764407321810722、0.0055232481099665165、-0.027901478111743927、-0.003490925 9993582964, 0.0307279285043478, 0.006472961511462927, 0.008861830458045006, -0.01802186481654644, 0.018281172960996628, -0.014223011210560799、-0.00018313586770091206、0.0026352116838097572、0.0006754148053005338、0.014975002966821194、0.024361 930787563324、-0.017166150733828545、0.0028880364261567593、0.011824417859315872、0.01710132323205471、 -0.0005003822734579444, -0.018890544772148132, -0.002192768268287182, -0.0018264965619891882, 0.011033530347049236, -0.00909520 7788050175, -0.022689398378133774, -0.004281813744455576, 0.007092057727277279, -0.015247276052832603, 0.024115590378642082, 0.002996621420606971, -0.02834230102598667, 0.030546413734555244, 0.02350621670484543, -0.020511215552687645, 0.010190781205 892563, -0.016582708805799484, 0.028238577768206596, -0.011967036873102188, 0.011623455211520195, -0.02797926962375641, 0.0026254875119775534、0.018307102844119072、0.0038701631128787994、-0.03850715234875679、0.006246067117899656、-0.000631251 4888122678, 0.010352848097682, -0.02358401007950306, -0.026708664372563362, -0.002863726345822215, 0.035862214863300323, 0.009860164485871792，-0.01726987399160862，0。004275330808013678, -0.02663087099790573, 0.009140586480498314, -0.013872946612536907, 0.019136887043714523, -0.0208353511989 11667、-0.0250879917293787、0.03044269047677517、0.026280807331204414、-0.013406192883849144、0.006683648563921452、 -0.01216800045222044、0.007824601605534554、0.031505849212408066、0.023726629093289375、0.0294832531362772、-0.0136784659698 60554, 0.033891480416059494, 0.009211895987391472, 0.017088359221816063, -0.02183368429541588, 0.01847565360367298, 0.004644844215363264, -0.009834233671426773, -0.011344699189066887, -0.0006725785788148642, 0.00012691882147919387, 0.0153380 33437728882, 0.025736261159181595, -0.003967403434216976, -0.007312469184398651, -0.01312743779271841, 0.02350621670484543, -0.0006843284936621785, -0.011785522103309631, 0.006570201832801104, -0.004187814891338348, -0.0070013003423810005, 0.01651788 31666708, -0.004537879955023527, 0.022715330123901367, -0.0025120405480265617, 0.025580676272511482, 0.005053253378719091, -0.0020063910633325577、-0.039285074919462204、-0.001816772622987628、0.0007224142318591475、0.0161029901355505、0.0408668480 8135033, 0.03536953032016754, 0.009626788087189198, -0.023571044206619263, -0.009607339277863503, 0.011085391975939274, 0.020835351198911667, -0.0009027139167301357, -0.007584741804748774, 0.016958704218268394, 0.011130770668387413, -0.016829051 077365875, -0.6712950468063354, -0.006511857267469168, -0.024854615330696106, -0.02663087099790573, -0.00008933950448408723, 0.0061779990792274475、0.004605947993695736、0.013231161050498486、-0.020187081769108772、0.00798666849732399、-0.0018475652 90518105, 0.04086684808135033, 0.007519915234297514, 0.0040808506309986115, -0.034021131694316864, -0.01997963711619377, -0.004972219467163086, -0.023220978677272797, 0.012129104696214199, 0.0018329792656004429, -0.011649386025965214, 0.028446022 421121597, -0.0010356089333072305, -0.006223377771675587, 0.021211346611380577, 0.004006299655884504, 0.021937407553195953, -0.02927580662071705, -0.01129283756017685, -0.009296170435845852, -0.01864420250058174, 0.02717541716992855, -0.00035553477937 35564, 0.0021700789220631123, 0.048360832035541534, -0.002277043182402849, -0.009049829095602036, 0.033969271928071976, 0.004557327833026648、0.018916476517915726、-0.000779542897362262、-0.00638544512912631、0.022183749824762344、-0.01275792438 5368824, -0.027149485424160957, -0.012278205715119839, 0.0238303504884243, -0.02963883802294731, 0.005218561738729477, -0.004434156697243452、0.013665501028299332、-0.0024520757142454386、0.002124700229614973、-0.007273572962731123、-0.003565476 9744724035, -0.0028621056117117405, 0.020640870556235313, 0.01091684214770794, -0.0006867594784125686, -0.011694764718413353, 0.011215046048164368、0.016504917293787003、0.00827838946133852、-0.0044471221044659615、0.010676982812583447、0.0277718249 70841408, -0.0133802630007267, 0.029820352792739868, 0.008349698968231678, -0.014573076739907265, -0.009017415344715118, 0.011655868031084538,-0.0061066895723342896,-0.013082059100270271、0.004353123251348734、0.00672254478558898、0.01773662678897381、0.012433790601789951、0.023843316361 308098, 0.015221345238387585, -0.0046221548691391945, -0.00026214358513243496, -0.016582708805799484, 0.016504917293787003, 0.028005201369524002、0.005516765173524618、-0.04309689253568649、0.013743292540311813、-0.0064308238215744495、-0.0071763326 41392946, 0.01911095716059208, 0.00446332897990942, -0.012971853837370872, -0.016919808462262154, 0.010048162192106247, 0.0032769974786788225、-0.021548446267843246、0.001816772622987628、0.01856641098856926、-0.04804966226220131、0.00728653836 9953632, -0.007299503777176142, -0.014080392196774483, 0.008952588774263859, 0.023908143863081932, 0.012932957150042057, -0.008433973416686058、0.012783855199813843、0.0430709607899189、-0.01015836838632822、0.03534360229969025、-0.00758474180474 8774, -0.016453055664896965, -0.005720969755202532, -0.014871280640363693, -0.026540113613009453, 0.005228285677731037, 0.0004019264888484031、0.005931657273322344、-0.02533433400094509、-0.018825719133019447、0.0023353875149041414、0.001405932 3584660888, -0.02020004764199257, 0.022481953725218773, 0.034980569034814835, -0.02709762565791607, -0.022974636405706406, -0.025023166090250015、0.00641785841435194、-0.00019822835747618228、-0.004845807328820229、0.0003723492263816297、-0.01013243 7571883202, 0.01498796883970499, 0.001948046963661909, -0.0020161152351647615, -0.008842382580041885, 0.0223652645945549, -0.013574742712080479、-0.002369421534240246、0.003275376744568348、0.005879795644432306、0.005789037793874741、0.0063595143 14681292, -0.03549918532371521, 0.003118171589449048, -0.026993902400135994, -0.01614188589155674, 0.011578075587749481, 0.0008524731383658946、-0.013367297127842903、0.004194297362118959、0.019331367686390877、0.006152068264782429、-0.015208380 296826363, -0.0018005658639594913, -0.015714028850197792, -0.01681608520448208, -0.028990568593144417, 0.010676982812583447, 0.024595309048891068, -0.045560311526060104, -0.0009262136882171035, 0.014845349825918674, -0.020887212827801704, 0.015739960 595965385, 0.011727177537977695, 0.0012560202740132809, -0.023052429780364037, 0.0014245701022446156, -0.013062611222267151, -0.011299320496618748、0.022274507209658623、0.011338216252624989、-0.007908876053988934、0.010339883156120777、-0.0061326203 86779308, 0.01247916929423809, -0.007947771809995174, -0.0025347298942506313, -0.011416008695960045, 0.011027047410607338, 0.004521673079580069、0.04880165681242943、0.0012543996563181281、0.02115948498249054、0.0165178831666708、-0.0253732297569 51332, 0.026125222444534302, -0.0031262750271707773, 0.007669016718864441, 0.003821542952209711, -0.021561412140727043, 0.008187631145119667、0.02358401007950306、0.02249491773545742、0.015247276052832603、-0.004560569301247597、0.030753860250 115395, 0.031090958043932915, -0.021457688882946968, 0.027694031596183777, -0.004823117982596159, 0.0049171168357133865, -0.018346000462770462，-0。0030355174094438553, -0.011176149360835552, 0.024102624505758286, 0.006923507899045944, 0.010009266436100006, -0.00510187353 938818, 0.0007916979375295341, -0.004722636193037033, 0.019914809614419937, 0.026190048083662987, -0.013289504684507847, 0.006346548907458782、-0.015415825881063938、-0.026734594255685806、0.003623821074143052、0.005325525999069214、-0.0039220247 41768837, -0.00640813447535038, -0.014624938368797302, -0.0065021333284676075, 0.007435640320181847, -0.002808623481541872, 0.010138919577002525、-0.033813685178756714、-0.0032008260022848845、0.01614188589155674、-0.018994268029928207、0.0081357704 47552204, -0.008596041239798069, -0.015662167221307755, 0.004310985561460257, -0.014663834124803543, 0.014962038025259972, -0.03479905426502228、0.013114472851157188、0.01341915875673294、0.05092797800898552、-0.011908693239092827、0.0053320089355 11112, -0.013367297127842903, 0.02501020021736622, -0.00029678543796762824, -0.02454344742000103, 0.003152205841615796, -0.015454721637070179、0.010028714314103127、-0.02102983184158802、-0.0032624113373458385、0.03583628311753273、-0.01502686459 5711231, 0.00672254478558898, 0.000010907877367571928, 0.019875913858413696, 0.020161151885986328, 0.014054462313652039, -0.005675591062754393, -0.009224860928952694, 0.014793488197028637, 0.03687351569533348, -0.005442214198410511, 0.00563345337 2865915, -0.0030436208471655846, -0.012615305371582508, -0.009075759910047054, 0.017192082479596138, -0.002220319816842675, 0.005798762198537588, -0.0007568534929305315, 0.010378778912127018, 0.005908967927098274, -0.0158825796097517, 0.00888127926 73707, 0.007766257040202618, -0.0030209312681108713, -0.013561777770519257, -0.035395462065935135, 0.022391194477677345, -0.0027049004565924406, 0.004748567007482052, -0.020433424040675163, -0.00028706141165457666, -0.005092149134725332, -0.0183719 30345892906, 0.006009449250996113, -0.00645027169957757, 0.015286171808838844, -0.012343033216893673, -0.008628454059362411, -0.010605673305690289、0.009192448109388351、0.007500466890633106、-0.013535846956074238、0.003831267124041915、-0.0295610446 4828968, 0.0009724028059281409, 0.0034585127141326666, -0.00004074468961334787, -0.025139853358268738, 0.012278205715119839, 0.023519182577729225、-0.012913509272038937、-0.006301170215010643、0.0037178201600909233、0.004716153722256422、-0.017905177 548527718, 0.009769407100975513, -0.019746258854866028, -0.011675315909087658, 0.007409709505736828, -0.022676432505249977, -0.013406192883849144、0.003922024741768837、0.03925914317369461、-0.011325251311063766、-0.014611972495913506、-0.02240416035 0561142, -0.03311355784535408, 0.0024634203873574734, 0.1057974249124527, 0.014145219698548317, 0.025956671684980392, 0.006878129206597805, -0.019914809614419937, -0.019162818789482117, -0.009231343865394592, -0.04423784464597702, 0.01201889850 1992226, -0.00921837892383337, 0.02408965863287449, -0.026501217857003212, 0.020225977525115013, 0.005014357157051563, 0.02053714729845524，0。014521215111017227, -0.002670866437256336, -0.020433424040675163, -0.0015372068155556917, -0.031168751418590546, 0.00512132141 73913, 0.006865163799375296, 0.010048162192106247, 0.003795612370595336, -0.009749959222972393, -0.024063728749752045, 0.026449356228113174, 0.00967864878475666, -0.009049829095602036, -0.012284688651561737, -0.02475089207291603, 0.003484443295 7470417, -0.00928320549428463, 0.011772556230425835, -0.01811262220144272, -0.01918874867260456, 0.009043346159160137, 0.023843316361308098、0.02580108679831028、0.005980277433991432、0.029327668249607086、-0.008103356696665287、0.00808390881 8662167, -0.005490834359079599, 0.021146519109606743, -0.0023499734234064817, -0.03298390284180641, 0.005283388774842024, -0.00043352958164177835, -0.024271173402667046, 0.03181701898574829, -0.000028944177756784484, -0.004479535389691591, -0.002066 355897113681, 0.017995934933423996, -0.012783855199813843, 0.013859981670975685, -0.006615580525249243, -0.0008403180981986225、0.025489918887615204、-0.01789221167564392、-0.03189481049776077、0.00028949242550879717、-0.032517150 04444122, 0.03588814660906792, -0.03500650078058243, -0.007869980297982693, -0.024361930787563324, 0.00451519014313817, -0.018177449703216553、0.020627904683351517、0.003249445930123329、0.010962220840156078、-0.005299595184624195、0.0480237342 41724014, -0.0033094107639044523, 0.012971853837370872, -0.02290981076657772, 0.017918141558766365, -0.016245609149336815, -0.013179299421608448, -0.020589008927345276, 0.0037469922099262476, -0.029327668249607086, -0.007383778691291809, 0.013017232 529819012, 0.006327101029455662, -0.02689017914235592, -0.004385536536574364, 0.005789037793874741, -0.005597798619419336, -0.004152160137891769, 0.012719028629362583, -0.008220044896006584, -0.01702353172004223, -0.011506766080856323, 0.00429802061 98990345, 0.0018702547531574965, -0.0032964455895125866, 0.007267090491950512, -0.009581409394741058, -0.0058182100765407085, -0.005429248791188002, -0.008829417638480663, -0.0030403793789446354, -0.01194110605865717, -0.002591453492641449, 0.0057566245 08649111, -0.01618078351020813, -0.009821268729865551, -0.00021210535487625748, -0.01768476516008377, -0.0005562954465858638, -0.017451388761401176、-0.015545479021966457、0.02332470193505287、0.015960371121764183、0.02208002656698227、0.013691431842 74435, -0.014495284296572208, -0.007701430004090071, -0.0005567006301134825, 0.027590308338403702, 0.05188741534948349, -0.023609939962625504、-0.017957039177417755、0.015999266877770424、-0.020900176838040352、0.003038758644834161、0.0210427958 51826668, -0.009814785793423653, 0.0014083633432164788, 0.010897394269704819, -0.0167253278195858, -0.020135220140218735, -0.005273664370179176, -0.009788854978978634, -0.002986897248774767, -0.008764590136706829, -0.006729027256369591, -0.0184497218 57905388, -0.009166517294943333, -0.002651418326422572, 0.008245975710451603, 0.0034358231350779533, -0.028757192194461823, 0.01511762198060751,-0.008544179610908031,0.005344973877072334, 0.013924808241426945, -0.003299686824902892, -0.04143732413649559, -0.0008403180981986225, 0.0109492558 98594856, -0.013600673526525497, -0.03448788449168205, -0.007863497361540794, -0.01809965819120407, -0.00444063963368535, 0.004920358303934336、0.0330357663333416、-0.008816451765596867、0.006683648563921452、0.00823301076889038、-0.0159474052488 80386, 0.02608632668852806, 0.0037243026308715343, -0.007623638026416302, -0.028031131252646446, 0.027123555541038513, 0.01843675784766674、0.016712361946702003、0.040374163538217545、-0.0021538722794502974、0.01885164901614189、-0.01174014341 0861492, 0.017490284517407417, -0.0004517621418926865, -0.00034439266892150044, -0.026190048083662987, -0.021729961037635803, 0.0020209772046655416, -0.014521215111017227, -0.01467679999768734, 0.002505557844415307, -0.01061863824725151, 0.01562327146 5301514, -0.010087057948112488, -0.0031748951878398657, 0.01631043665111065, 0.016375262290239334, -0.013257091864943504, 0.010741809383034706、-0.012932957150042057、-0.002484489232301712、0.0027324517723172903、0.00897203665226698、-0.0047939456 99930191, 0.0043466403149068356, -0.0020047705620527267, 0.0021538722794502974, 0.021263208240270615, -0.0269679706543684, -0.024115590378642082、-0.0025833500549197197、0.030598275363445282、0.002772968728095293、0.01584368385374546、0.0069818519 98716593, -0.0037113374564796686, -0.01273199450224638, -0.026280807331204414, -0.02182071842253208, -0.049527715891599655, 0.02195037342607975, -0.008628454059362411, -0.004353123251348734, 0.01064456906169653, -0.009698097594082355, -0.040944639593 36281, 0.0238303504884243, 0.0034649954177439213, 0.032802388072013855, 0.0002048123424174264, 0.022507883608341217, 0.03770329803228378、-0.010346366092562675、0.0028588641434907913、0.026410460472106934、0.019085025414824486、0.0088488655 16483784, 0.015830717980861664, -0.004469811450690031, 0.013808120042085648, -0.012031864374876022, -0.02099093608558178, -0.006054827943444252、-0.045638103038072586、-0.024050762876868248、0.014417491853237152、0.01218744833022356、0.00324134272 52322435, -0.013302470557391644, -0.0003156257444061339, 0.006942956242710352, 0.00542600778862834, -0.0034358231350779533, 0.022067060694098473, -0.013847015798091888, -0.026942040771245956, -0.0334506556391716, -0.01835896447300911, -0.0021036313846 707344, -0.001962633104994893, 0.012615305371582508, -0.0186053067445755, 0.01572699472308159, -0.02542509138584137, 0.019422125071287155, -0.013950739055871964, -0.002110114088281989, 0.02052418142557144, -0.0014197081327438354, 0.0010485743 405297399, -0.004372571129351854, 0.0069299908354878426, -0.005105114541947842, -0.003756716148927808, -0.015960371121764183, 0.025554746389389038、0.003516856813803315、0.005951105151325464、0.009736993350088596、0.043459922075271606、-0.0089525887 74263859, 0.021315069869160652, -0.011318768374621868, -0.016375262290239334, -0.004560569301247597, -0.026656802743673325, 0.004842565860599279，0.0004894427256658673, -0.023635871708393097, 0.007448605261743069, -0.008965553715825081, 0.0026092808693647385, -0.0199926011 2643242, -0.007811635732650757, 0.012142069637775421, -0.01375625841319561, -0.02102983184158802, -0.006806819699704647, 0.015869613736867905, -0.0074032265692949295, -0.001892944099381566, -0.0037016132846474648, -0.005322284530848265, 0.03293204 307556152, -0.014430457726120949, 0.0418262854218483, -0.012641236186027527, 0.018216345459222794, -0.028290439397096634, 0.02576219104230404、0.008433973416686058、0.013963703997433186、0.030598275363445282、-0.01225227490067482、0.012051312252 879143, 0.0014553628861904144, -0.008822934702038765, 0.01100111659616232, 0.009860164485871792, -0.004388778004795313, -0.01685498282313347、0.01091035921126604、-0.00033223762875422835、-0.007850532419979572、-0.0006320617976598442、0.002114976 057782769, -0.007532880175858736, 0.01710132323205471, 0.015610306523740292, -0.009036863222718239, 0.008200597018003464, 0.012174483388662338、0.00447305291891098、0.0186053067445755、-0.019253576174378395、0.010638087056577206、-0.0208612810820 3411, 0.022404160350561142, 0.010437123477458954, 0.0006920266896486282, -0.02128913812339306, -0.009296170435845852, -0.004106780979782343、0.044808320701122284、-0.013782189227640629、-0.003750233445316553、-0.01181145291775465、0.02764216996 729374, 0.011960554867982864, -0.005043528974056244, 0.006155309733003378, -0.015584375709295273, 0.012433790601789951, -0.021600307896733284、-0.04314875230193138、-0.01214855257421732、-0.024776823818683624、0.039077628403902054、0.016271540895 104408, 0.000348039175150916, -0.01511762198060751, 0.0014926382573321462, -0.04068533331155777, -0.0020290804095566273, -0.006904060021042824、0.02099093608558178、0.017049461603164673、-0.006981851998716593、0.007364330347627401、0.00741619197 6517439, 0.00766253424808383, 0.02153548039495945, -0.002995000686496496, 0.02157437615096569, -0.011312286369502544, -0.009685131721198559, 0.00414891866967082, -0.009672166779637337, -0.01308854203671217, -0.003380720503628254, -0.003168412484 228611, 0.013769223354756832, -0.012615305371582508, 0.007973702624440193, 0.001315985107794404, -0.006139102857559919, -0.028212646022439003、0.0004906582762487233、0.0006340876570902765、0.013289504684507847、-0.010359331034123898、-0.02956104 464828968, 0.0263456329703331, 0.02621597982943058, 0.005357939284294844, -0.022754225879907608, -0.009393410757184029, 0.007053161505609751, -0.018086692318320274, -0.0012552099069580436, 0.003977127373218536, -0.010839049704372883, -0.015843683 85374546, 0.007753291632980108, 0.005951105151325464, 0.02478978969156742, -0.00858955830335617, 0.007280055433511734, 0.013257091864943504, -0.0000065713156800484285, 0.007234676741063595, -0.00413919473066926, -0.01467679999768734, -0.01833303 4589886665, -0.017658835276961327, -0.01681608520448208, 0.005108356010168791, -0.007630120497196913, 0.008479352109134197, -0.02771996334195137，0.004567051772028208，-0。018579376861453056, -0.003983610309660435, -0.0023110774345695972, 0.023065393790602684, 0.04281165450811386, -0.015273206867 277622, -0.006696613971143961, 0.002272181212902069, -0.008356180973351002, -0.0.014508250169456005, -0.0066090975888073444, 0.00827838946133852, -0.016906842589378357, 0.003750233445316553, -0.008524730801582336, -0.0022802846506237984, -0.0051569761 70837879, -0.009633270092308521, -0.035940006375312805, -0.004323950968682766, 0.027771824970841408, 0.19261354207992554, -0.014547145925462246, -0.006657717749476433, 0.013808120042085648, -0.021340999752283096, 0.011869796551764011, 0.0241155903 78642082, 0.014080392196774483, 0.0023856281768530607, 0.0005133476224727929, -0.016206713393330574, 0.01723097823560238, 0.008012599311769009、0.0019723570439964533、0.006560477428138256、-0.040996503084897995、-0.010657534934580326、0.000370323 39605502784, -0.027875546365976334, -0.011727177537977695, -0.00768198212608695, -0.007299503777176142, -0.011202080175280571, -0.01939619518816471、0.039622172713279724、-0.011668833903968334、-0.015830717980861664、0.016919808462262154、0.03207632899 284363, 0.015960371121764183, -0.01093629002571106, -0.016842016950249672, -0.008336733095347881, -0.013244125992059708, -0.011999450623989105, -0.020122256129980087, -0.007422674912959337, -0.02501020021736622, -0.008505282923579216, -0.00552648911 2526178, -0.0011830900330096483, 0.01773662678897381, 0.010709396563470364, -0.007267090491950512, 0.015999266877770424, 0.02604742906987667, -0.013315435498952866, 0.01621967926621437, -0.02082238532602787, -0.01689387857913971, -0.04390074685215 95、-0.03358031064271927、0.000994281843304634、0.03726247698068619、-0.02208002656698227、0.000011990435268671717、 0.006949438713490963、0.020433424040675163、0.00515373470261693、-0.031298406422138214、0.0031116888858377934、0.0157010648 39959145, -0.02813485451042652, -0.007377295754849911, 0.007461570668965578, 0.03985555097460747, -0.010975186713039875, -0.025697365403175354、0.0397258959710598、-0.026319703087210655、-0.0030403793789446354、-0.010067610070109367、-0.00248610973 3581543, -0.0088812792673707, 0.0017438423819839954, -0.001923736883327365, 0.017827384173870087, 0.006220136769115925, 0.010255607776343822、0.001199296792037785、-0.01772366091609001、0.035136155784130096、-0.0061066895723342896、-0.0107353273 77915382, -0.010651051998138428, -0.026151152327656746, 0.006981851998716593, 0.006622062996029854, -0.010048162192106247, -0.0009124379721470177、-0.00419105589389801、-0.019668467342853546、0.00012296844215597957、0.004894427489489317、0.00685219 8392152786, 0.010437123477458954, 0.005908967927098274, 0.0038247844204306602, -0.008103356696665287, -0.006456754636019468, -0.028653468936681747、0.018216345459222794、0.032205980271101、0.00022101905778981745、-0.029664767906069756、-0.00815521832 5555325、0.03871459513902664、0.03394334018230438、0.005860347766429186、-0.013600673526525497、-0.016958704218268394、 0.006372479721903801，0.0012543996563181281, -0.01911095716059208, -0.010437123477458954, 0.008356180973351002, -0.012855164706707, -0.008472870104014 874, 0.019370263442397118, -0.029457321390509605, 0.0034487885423004627, -0.015415825881063938, -0.00047364120837301016, 0.008887761272490025、-0.0020015290938317776、0.010501950047910213、-0.007500466890633106、-0.0017470837337896228、0.01717911 660671234, -0.024063728749752045, 0.026734594255685806, -0.024556411430239677, 0.0013573121977970004, -0.00010007645323639736, -0.00450546620413661, 0.007513432297855616, 0.027201347053050995, 0.003426099196076393, -0.022183749824762344, 0.00281348545 1042652, 0.008064460940659046, 0.002243009163066745, 0.009899060241878033, 0.010988151654601097, -0.004790704697370529, -0.004638361278921366, 0.006025656126439571, -0.010605673305690289, -0.01625857502222061, -0.020342666655778885, -0.01609002426 2666702, -0.026410460472106934, 0.0121226217597723, -0.009406376630067825, 0.0023759042378515005, -0.0273828636854887, -0.015260240994393826, -0.004832841921597719, -0.0007702240254729986, 0.01856641098856926, -0.031039098277688026, 0.0073967440 985143185, 0.018721995875239372, -0.023026498034596443, -0.008200597018003464, -0.023480286821722984, -0.16450461745262146, 0.025710329413414, 0.01681608520448208, -0.009023898281157017, 0.023428425192832947, -0.022754225879907608, 0.02761624008417 1295, 0.015234310179948807, -0.009224860928952694, 0.005166700109839439, 0.0008131718495860696, 0.0038507150020450354, -0.03153178095817566, -0.0026757284067571163, 0.003335341578349471, 0.00672254478558898, -0.030546413734555244, 0.03627710789 4420624, 0.017256908118724823, 0.0010526260593906045, 0.0053125605918467045, -0.02091314271092415, -0.0016555157490074635, -0.0012454859679564834、0.023467320948839188、0.009497134014964104、0.0046351198107004166、0.005380628630518913、-0.02169106 5281629562, -0.013062611222267151, -0.048023734241724014, -0.0008427490829490125, 0.017321735620498657, 0.021340999752283096, 0.011740143410861492、0.012219862081110477、-0.012984818778932095、0.007020748220384121、-0.015130587853491306、-0.0161937475 20446777, 0.0071439193561673164, 0.03236156702041626, 0.024997234344482422, 0.01185683161020279, 0.010735327377915382, 0.04636416584253311、0.014599007554352283、-0.009004450403153896、0.019383229315280914、-0.009607339277863503、-0.00414891866 967082, -0.008336733095347881, -0.019888877868652344, -0.0005830365116707981, 0.02771996334195137, 0.005620488431304693, -0.00701426574960351、0.013730327598750591、0.014145219698548317、0.011331734247505665、-0.021807754412293434、0.02285794913 7687683, 0.01593444123864174, -0.0031343784648925066, 0.001282761339098215, -0.028627539053559303, 0.013354332186281681, 0.0034098925534635782, -0.014689764939248562, -0.004784221760928631, -0.015208380296826363, -0.00796722061932087, -0.0086932806 29813671, -0.02311725541949272, 0.011629937216639519, -0.012323584407567978, -0.03243935853242874, 0.007643085904419422, 0.00766253424808383，0.0028702090494334698, -0.017412493005394936, 0.026267841458320618, 0.010884428396821022, -0.03448788449168205, 0.004327192436 903715, 0.018838683143258095, -0.02228747308254242, -0.014702730812132359, -0.01020374707877636, -0.027694031596183777, 0.006122896447777748、-0.004252641461789608、-0.012686614878475666、-0.008829417638480663、0.03319134935736656、0.01789221167 564392, 0.021250242367386818, -0.006683648563921452, 0.009412859566509724, -0.02294870652258396, 0.0009659201023168862, -0.008336733095347881, -0.019603639841079712, -0.012116138823330402, 0.009775889106094837, 0.03993334248661995, 0.00989257823 6758709, 0.017153184860944748, 0.015545479021966457, -0.01288109552115202, -0.020433424040675163, 0.013652535155415535, 0.022170783951878548、0.024102624505758286、-0.003623821074143052、0.03230970352888107、0.01852751523256302、-0.031324334442 61551、-0.017218012362718582、0.011279872618615627、0.052250444889068604、0.005604281555861235、0.010722361505031586、 0.006155309733003378, -0.016362298280000687, 0.0038020950742065907, -0.1179330125451088, 0.0006563718779943883, 0.0069235078 99045944, 0.010300987400114536, 0.010313952341675758, 0.016128921881318092, 0.010683465749025345, 0.032050397247076035, -0.0040808506309986115, 0.011318768374621868, -0.021016865968704224, -0.05787741392850876, -0.018786821514368057, -0.0315577127 0394325, 0.010994634591042995, -0.00672254478558898, 0.010605673305690289, -0.029042430222034454, -0.018294138833880424, 0.01147435326129198、-0.0367957204580307、0.016906842589378357、0.010385261848568916、-0.006301170215010643、-0.0145471459254 62246, -0.004356364719569683, -0.03181701898574829, -0.0031505851075053215, 0.004936564713716507, 0.012952405028045177, 0.010398227721452713, -0.018164483830332756, 0.01794407330453396, -0.020977970212697983, -0.0003221084189135581, 0.0076171550 89974403, 0.0036173383705317974, -0.01026209071278572, 0.037651438266038895, -0.015662167221307755, 0.011156701482832432, -0.014599007554352283、-0.00417160801589489、-0.03412485495209694、0.010022231377661228、0.004084091633558273、-0.005659384187 310934, -0.0012973473640158772, 0.02266346849501133, -0.015195414423942566, -0.021211346611380577, -0.01056029461324215, -0.008284871466457844、-0.001761669758707285、0.005711245816200972、0.009205413050949574、0.008997967466711998、-0.0214706547 55830765, -0.02379145473241806, 0.013872946612536907, -0.004845807328820229, -0.016193747520446777, -0.003912300802767277, 0.00304200011305511, -0.002687073079869151, -0.007617155089974403, 0.003983610309660435, -0.028575677424669266, 0.01293944008 6483955, -0.004434156697243452, -0.020381562411785126, 0.0030338966753333807, -0.022131888195872307, 0.0012187449028715491, -0.020251909270882607、0.003640027716755867、-0.018449721857905388、0.008557144552469254、0.029042430222034454、-0.0080709429 4577837, -0.025502884760499, -0.025852948427200317, 0.03057234361767769, -0.032205980271101, 0.011779039166867733, 0.007481019012629986，-0.010112988762557507，0。017114289104938507, 0.011623455211520195, -0.01751621626317501, -0.009341550059616566, -0.005238009616732597, -0.0135617777705 19257, -0.005001391749829054, -0.014702730812132359, 0.008609006181359291, -0.009568443521857262, 0.00857011042535305, 0.0027049004565924406、0.009101689793169498、-0.018294138833880424、-0.0010202126577496529、-0.07286538183689117、0.012148552 57421732, -0.011403043754398823, 0.0032656528055667877, 0.0046221548691391945, -0.017568077892065048, 0.019136887043714523, -0.022546779364347458, -0.0037826469633728266, -0.004913875367492437, -0.01572699472308159, 0.034306369721889496, 0.0135099161 41629219, -0.014158184640109539, -0.011014082469046116, -0.010787188075482845, 0.005027322564274073, 0.002033942611888051, 0.017218012362718582、0.02478978969156742、-0.010430640541017056、0.0027437966782599688、0.00802556425333023、-0.01406742725 521326, 0.0038442325312644243, 0.0035038914065808058, -0.003345065750181675, 0.02386924810707569, -0.00384747376665473, -0.012550478801131248、0.0008500420954078436、-0.012025381438434124、0.015662167221307755、0.019914809614419937、0.029846282 675862312, -0.026656802743673325, -0.006203929893672466, -0.011033530347049236, 0.04947585612535477, 0.03575849160552025, -0.007960737682878971, -0.024984268471598625, 0.013548812828958035, -0.02484164945781231, -0.01406742725521326, 0.011681798845 529556、-0.022806087508797646、0.0018378413515165448、0.030961304903030396、0.007928323931992054、0.03251715004444122、 0.010884428396821022, 0.002808623481541872, -0.008466387167572975, 0.02379145473241806, -0.019162818789482117, 0.05357291176 915169, -0.0044049848802387714, -0.0040581608191132545, -0.013471020385622978, 0.020718662068247795, 0.00829783733934164, -0.01685498282313347, -0.004100298509001732, -0.000024132808903232217, -0.014482319355010986, -0.03404706344008446, 0.007876462 303102016, 0.0011855211341753602, -0.0405556783080101, -0.01225227490067482, -0.006268756929785013, 0.015312102623283863, 0.015299137681722641、0.013548812828958035、0.014560110867023468、0.01471569575369358、-0.002121458761394024、-0.01100111659 616232, 0.00015933225222397596, 0.01965550146996975, -0.003769681556150317, -0.02826450765132904, 0.01413225382566452, 0.029198015108704567、0.048568278551101685、-0.005461662542074919、0.014274872839450836、0.0036529931239783764、0.005160217 639058828, 0.0010145402047783136, 0.017243942245841026, -0.006793854292482138, 0.0005344163510017097, 0.01341915875673294, 0.019538814201951027, -0.003721061395481229, -0.01056029461324215, 0.005033805035054684, 0.03562884032726288, -0.004832841921 597719, 0.012997783720493317, -0.006443789228796959, -0.015817752107977867, -0.015947405248880386, 0.023208012804389, -0.019590675830841064, -0.0267605260014534, -0.008045012131333351, 0.0018005658639594913, 0.022935740649700165, -0.00632385956 1234713, -0.0033677550964057446, 0.02027783915400505, -0.020433424040675163, 0.01689387857913971, -0.027019832283258438, -0.040166717022657394, -0.0001858707400970161,0.009393410757184029, 0.0010169713059440255, 0.00733839999884367, 0.00923782680183649, -0.011007599532604218, 0.02233933284 8787308, 0.01406742725521326, 0.01659567467868328, -0.021794788539409637, -0.019085025414824486, -0.008245975710451603, 0.016323402523994446, -0.0023759042378515005, -0.0077208783477544785, -0.001962633104994893, 0.0036108556669205427, -0.0008832 658641040325, -0.0267605260014534, 0.02873126231133938, -0.022935740649700165, 0.02412855438888073, -0.005513523705303669, 0.00507918419316411、0.005951105151325464、0.005173183046281338、0.005001391749829054、-0.0177625585347414、0.0151305878534 91306, -0.01999260112643242, -0.0192406103014946, 0.02140582725405693, -0.007377295754849911, 0.02927580662071705, -0.015104657039046288、-0.01216800045222044、0.0034552712459117174、-0.003481202060356736、0.013561777770519257、0.0022592158 056795597, -0.01183090079575777, 0.013665501028299332, 0.017075393348932266, 0.008511765860021114, -0.007409709505736828, -0.0014261907199397683、-0.003058206755667925、0.0031424816697835922、0.0021846650633960962、-0.000989419873803854、-0.0221448 54068756104, 0.0036270625423640013, -0.006233102176338434, -0.016504917293787003, 0.003999816719442606, 0.017931107431650162, -0.025956671684980392、0.021626237779855728、0.002192768268287182、-0.001260882243514061、0.018721995875239372、-0.0234932508 31961632, 0.030598275363445282, -0.011616972275078297, -0.019331367686390877, 0.01505279541015625, 0.01505279541015625, 0.004524914547801018, 0.0019042887724936008, -0.014962038025259972]01505279541015625, 0.004524914547801018, 0.0019042887724936008, -0.014962038025259972]01505279541015625, 0.004524914547801018, 0.0019042887724936008, -0.014962038025259972]

语义上相似的单词通常由在这个向量空间中彼此接近的向量表示。这使得加法和减法等数学运算能够传达语义。例如，“国王”减去“男人”加上“女人”的向量表示应该接近“女王”的向量表示。换句话说，向量嵌入是特定数据对象的数值表示。

向量索引允许您根据节点或关系的嵌入属性与查询中指定的属性之间的相似性来检索节点或关系的邻域。

创建向量索引

向量索引是节点的单标签、单属性索引或关系的单关系类型、单属性索引。它可用于通过LIST<INTEGER | FLOAT>对索引的维度和向量相似度函数有效的属性来索引节点或关系。请注意，可用的向量索引提供程序（vector-2.0（默认）和vector-1.0）支持不同的索引架构、属性值类型和向量维度。有关更多信息，请参阅兼容性的向量索引提供程序。

使用CREATE VECTOR INDEX命令创建向量索引，建议在创建索引时指定名称，如果创建时未指定名称，则会分配一个随机名称。从 Neo4j 5.16 开始，索引名称也可以作为参数指定：CREATE VECTOR INDEX $name …。

索引名称在索引和约束中必须是唯一的。
新创建的索引不会立即可用，而是在后台创建。

创建索引需要权限CREATE INDEX。

为属性Movie上的节点创建向量索引embedding在 5.15 中引入

CREATE VECTOR INDEX moviePlots IF NOT EXISTS
FOR (m:Movie)
ON m.embedding
OPTIONS {indexConfig: {
 `vector.dimensions`: 1536,
 `vector.similarity_function`: 'cosine'
}}

该CREATE VECTOR INDEX命令是可选的幂等命令。这意味着，如果尝试两次创建相同的索引，则其默认行为是抛出错误。使用IF NOT EXISTS，如果已存在具有相同名称、架构或两者的索引，则不会抛出任何错误，也不会发生任何事情。如果存在具有相同名称的约束，它仍可能会抛出错误。从 Neo4j 5.17 开始，当什么都没有发生时会返回信息通知，显示阻止创建的现有索引。

该OPTIONS映射是必需的，因为如果不设置向量维度和相似度函数，就无法创建向量索引。在此示例中，向量维度设置为1536，向量相似度函数为cosine，这通常是文本嵌入的首选相似度函数。要了解有关可用相似度函数的更多信息，请参阅余弦和欧几里得相似度函数。

在 Neo4j 5.15 之前，节点向量索引是使用该db.index.vector.createNodeIndex过程创建的。

您还可以使用以下语法为给定属性上具有特定类型的关系创建向量索引：

为单个属性上的关系类型创建向量索引在 5.18 中引入

CREATE VECTOR INDEX name IF NOT EXISTS
FOR ()-[r:REL_TYPE]-() ON (r.embedding)
OPTIONS {indexConfig: {
 `vector.dimensions`: $dimension,
 `vector.similarity_function`: $similarityFunction
}}

查询向量索引

要查询节点向量索引，请使用该db.index.vector.queryNodes过程。

签名db.index.vector.queryNodes

db.index.vector.queryNodes(indexName :: STRING, numberOfNearestNeighbours :: INTEGER, query :: ANY) :: (node :: NODE, score :: FLOAT)

指indexName的是要查询的向量索引的唯一名称。
指numberOfNearestNeighbours的是要返回的最近邻居的数量。
该query向量指的是在LIST<INTEGER | FLOAT>其中搜索邻域。

该过程返回节点的邻域及其各自的相似性得分，并按得分排序。得分介于0和之间1，得分越接近1，索引向量与查询向量越相似。

找出与《教父》情节最相似的 5 部电影

MATCH (m:Movie {title: 'Godfather, The'})
CALL db.index.vector.queryNodes('moviePlots', 5, m.embedding)
YIELD node AS movie, score
RETURN movie.title AS title, movie.plot AS plot, score

结果

<span style="color:#5e636a"><span style="background-color:#ffffff"><span style="color:#1a1b1d"><code class="language-none">+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| title                      | plot                                                                                                                                                                                                                     | score              |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| "Godfather, The"           | "The aging patriarch of an organized crime dynasty transfers control of his clandestine empire to his reluctant son."                                                                                                    | 1.0                |
| "Godfather: Part III, The" | "In the midst of trying to legitimize his business dealings in New York and Italy in 1979, aging Mafia don Michael Corleone seeks to avow for his sins while taking a young protégé under his wing."                     | 0.9648237228393555 |
| "Godfather: Part II, The"  | "The early life and career of Vito Corleone in 1920s New York is portrayed while his son, Michael, expands and tightens his grip on his crime syndicate stretching from Lake Tahoe, Nevada to pre-revolution 1958 Cuba." | 0.9547788500785828 |
| "Scarface"                 | "An ambitious and near insanely violent gangster climbs the ladder of success in the mob, but his weaknesses prove to be his downfall."                                                                                  | 0.9367183446884155 |
| "Jane Austen's Mafia!"     | "Takeoff on the Godfather with the son of a mafia king taking over for his dying father"                                                                                                                                 | 0.9366795420646667 |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</code></span></span></span>

请注意，返回的所有电影都围绕犯罪家族组织展开情节。结果按降序score排列，其中最匹配的结果条目放在第一位（在本例中，相似度得分为，这是可以预料的，因为索引是使用此特定属性查询的）。如果不需要查询向量本身，则添加谓词会删除相同的向量。The Godfather1.0WHERE score < 1

要查询关系向量索引，请使用该db.index.vector.queryRelationships过程。

签名db.index.vector.queryRelationships 在 5.18 中引入

db.index.vector.queryRelationships(indexName :: STRING, numberOfNearestNeighbours :: INTEGER, query :: ANY) :: (relationship :: RELATIONSHIP, score :: FLOAT)

db.index.vector.queryRelationships具有与相同的参数描述db.index.vector.queryNodes。

使用向量函数计算两个特定向量对之间的相似度得分，而无需使用向量索引。

性能建议

向量索引可以利用孵化的 Java 20 Vector API 来显著提高速度。如果您使用的是兼容版本的 Java，则可以将以下设置添加到配置设置中：

配置设置

server.jvm.additional=--add-modules jdk.incubator.vector

显示向量索引

要列出数据库中的所有向量索引，请使用该SHOW VECTOR INDEXES命令。此SHOW命令与其他索引的命令相同，但索引类型筛选为VECTOR。

列出索引需要权限SHOW INDEX。

例 1. 显示所有向量索引

使用默认返回列显示向量索引

SHOW VECTOR INDEXES

结果

<span style="color:#5e636a"><span style="background-color:#ffffff"><span style="color:#1a1b1d"><code class="language-none">+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id | name         | state    | populationPercent | type     | entityType | labelsOrTypes | properties        | indexProvider | owningConstraint | lastRead                 | readCount |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 2  | "moviePlots" | "ONLINE" | 100.0             | "VECTOR" | "NODE"     | ["Movie"]     | ["embedding"]     | "vector-2.0"  | NULL             | 2024-05-07T09:19:09.225Z | 47        |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+</code></span></span></span>

有关所有返回列的完整描述，请参阅搜索结果索引 → 列表索引的结果列。

示例 2.显示具有完整或筛选详细信息的向量索引

要返回完整的向量索引详细信息，请使用YIELD *。

显示所有向量索引及所有返回列

SHOW VECTOR INDEXES YIELD *

结果

+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id | name         | state    | populationPercent | type     | entityType | labelsOrTypes | properties        | indexProvider | owningConstraint | lastRead                 | readCount | trackedSince             | options                                                                                                         | failureMessage | createStatement                                                                                                                                                                                  |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| 2  | "moviePlots" | "ONLINE" | 100.0             | "VECTOR" | "NODE"     | ["Movie"]     | ["embedding"]     | "vector-2.0"  | NULL             | 2024-05-07T09:19:09.225Z | 47        | 2024-05-07T08:26:19.072Z | {indexConfig: {`vector.dimensions`: 1536, `vector.similarity_function`: "COSINE"}, indexProvider: "vector-2.0"} | ""             | "CREATE VECTOR INDEX `moviePlots` FOR (n:`Movie`) ON (n.`embedding`) OPTIONS {indexConfig: {`vector.dimensions`: 1536,`vector.similarity_function`: 'COSINE'}, indexProvider: 'vector-2.0'}"     |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

要仅返回特定的详细信息，请在子句后指定所需的列名YIELD。

显示所有带有过滤返回列的向量索引

SHOW VECTOR INDEXES YIELD name, type, entityType, labelsOrTypes, properties

结果

+----------------------------------------------------------------------+
| name         | type     | entityType | labelsOrTypes | properties    |
+----------------------------------------------------------------------+
| "moviePlots" | "VECTOR" | "NODE"     | ["Movie"]     | ["embedding"] |
+----------------------------------------------------------------------+

删除向量索引

使用与其他索引相同的命令删除向量索引。DROP INDEX从 Neo4j 5.16 开始，删除索引时也可以将索引名称作为参数给出： DROP INDEX $name。

删除索引需要权限DROP INDEX。

删除向量索引

DROP INDEX moviePlots

用于兼容性的向量索引提供程序

从 Neo4j 5.18 开始，默认和首选的向量索引提供程序是vector-2.0。以前创建的vector-1.0索引将继续起作用。vector-1.0如果在映射中指定了提供程序，仍然可以使用该提供程序创建新索引OPTIONS。

余弦和欧几里得相似函数

相似度函数的选择会影响哪些索引向量被视为相似，哪些是有效的。向量的语义含义本身可能决定选择哪个相似度函数。请参阅您正在使用的特定向量嵌入模型的文档，因为它可能会建议对某些相似度函数的偏好。否则，能够区分各种相似度函数可以帮助做出更明智的决定。

表 1. 相似度函数
姓名	不区分大小写的参数	关键相似特征
余弦	`"cosine"`	角度
欧几里得	`"euclidean"`	距离

-标准化向量（单位向量），余弦和欧几里得相似函数产生相同的相似性顺序。

向量索引程序

用法	程序	描述
创建节点向量索引。	db.index.vector.createNodeIndex	使用给定的相似度函数为具有给定向量维度的指定标签和属性创建向量索引。由命令替换`CREATE VECTOR INDEX`。
使用节点向量索引。	db.index.vector.queryNodes	查询给定的节点向量索引。返回请求的近似最近邻节点数量及其相似度得分，按得分排序。
使用关系向量索引。	db.index.vector.queryRelationships	查询给定的关系向量索引。返回请求的近似最近邻关系数量及其相似性得分，按得分排序。在 5.18 中引入
设置节点矢量属性。	db.create.setNodeVectorProperty	使用给定的向量以比直接使用更节省空间的方式更新给定的节点属性SET。替换db.create.setVectorProperty。测试版在 5.13 中引入
设置节点矢量属性。	db.create.setVectorProperty	取而代之db.create.setNodeVectorProperty。已弃用测试版
设置关系向量属性。	db.create.setRelationshipVectorProperty	使用给定的向量以比直接使用更节省空间的方式更新给定的关系属性SET。测试版在 5.18 中引入