Re: [Neo4j] Questions on custom query using the index framework
2010/11/13 Samuel Feng okos...@gmail.com
Hi,
I am new to neo4j.
I am using a custom analyzer in index in order to support Chinese.
chnIndex = this.graphDb.index().forNodes(product_chinese,
MapUtil.stringMap(analyzer,
org.wltea.analyzer.lucene.IKAnalyzer));
Below is the usage of the IKAnalyzer in lucence.
IndexSearcher isearcher = new IndexSearcher(directory);
isearcher.setSimilarity(new IKSimilarity()); // A custom Similarity
String word = OLYMPUS 奥林巴斯 E-PL1 时尚白 微型4/3系统相机 套机 含14-42mm镜头;
Query query = IKQueryParser.parse(fieldName, word ); // A custom
QueryParser
TopDocs topDocs = isearcher.search(query, 5); // Got the top 5
System.out.println(Found + topDocs.totalHits);
ScoreDoc[] scoreDocs = topDocs.scoreDocs;
for (int i = 0; i topDocs.totalHits; i++) {
System.out.println(scoreDocs[i].score); // Got the score of each
matched doc
Document targetDoc = isearcher.doc(scoreDocs[i].doc);
System.out.println(Document content is + targetDoc.toString());
}
How can I use the query method of neo4j's indexing to implement
1) Add my custom Similartiy implemtation
That would require new functionality, probably exposed as a configuration
parameter similarity:org.wltea.analyzer.lucene.IKAnalyzer or something.
2) The TopDocs interface can replaced by the iterator of IndexHits, right?
In a way, yes. Actually IndexHits wraps a Hits instance (from lucene 2.x),
since it gives all the hits back. To make use of TopDocs instead a method
could be exposed via the QueryContext class. That's definately possible.
3) Possible to get the score for each node in the IndexHits?
Would it be ok with an IndexHits#currentScore() method which could return
the score of the most recently returned node from the IndexHits object?
Thank you for the help and time spent on this.
These are great ideas and I'd be happy to try and implement them.
Samuel
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Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
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[Neo4j] Simplicity from Complexity
Fun TED talk using graphs to represent complex systems... http://www.youtube.com/watch?v=UB2iYzKeej8 Cheers, Andreas ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Questions on custom query using the index framework
Mattias,
Thanks a lot. Please find my update in red.
Thanks and Regards,
Samuel
2010/11/14 Mattias Persson matt...@neotechnology.com
2010/11/13 Samuel Feng okos...@gmail.com
Hi,
I am new to neo4j.
I am using a custom analyzer in index in order to support Chinese.
chnIndex = this.graphDb.index().forNodes(product_chinese,
MapUtil.stringMap(analyzer,
org.wltea.analyzer.lucene.IKAnalyzer));
Below is the usage of the IKAnalyzer in lucence.
IndexSearcher isearcher = new IndexSearcher(directory);
isearcher.setSimilarity(new IKSimilarity()); // A custom
Similarity
String word = OLYMPUS 奥林巴斯 E-PL1 时尚白 微型4/3系统相机 套机 含14-42mm镜头;
Query query = IKQueryParser.parse(fieldName, word ); // A custom
QueryParser
TopDocs topDocs = isearcher.search(query, 5); // Got the top 5
System.out.println(Found + topDocs.totalHits);
ScoreDoc[] scoreDocs = topDocs.scoreDocs;
for (int i = 0; i topDocs.totalHits; i++) {
System.out.println(scoreDocs[i].score); // Got the score of each
matched doc
Document targetDoc = isearcher.doc(scoreDocs[i].doc);
System.out.println(Document content is + targetDoc.toString());
}
How can I use the query method of neo4j's indexing to implement
1) Add my custom Similartiy implemtation
That would require new functionality, probably exposed as a configuration
parameter similarity:org.wltea.analyzer.lucene.IKAnalyzer or something.
Maybe QueryContext can also be used here?
2) The TopDocs interface can replaced by the iterator of IndexHits,
right?
In a way, yes. Actually IndexHits wraps a Hits instance (from lucene 2.x),
since it gives all the hits back. To make use of TopDocs instead a method
could be exposed via the QueryContext class. That's definately possible.
3) Possible to get the score for each node in the IndexHits?
Would it be ok with an IndexHits#currentScore() method which could return
the score of the most recently returned node from the IndexHits object?
That is a good idea. Please let me know the schedule of implement this, as
my team is looking forward to this feature. :)
Thank you for the help and time spent on this.
These are great ideas and I'd be happy to try and implement them.
Samuel
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Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
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Re: [Neo4j] Spatial search using Lucene-spatial?
Christopher, thanks for the pointers! Yes, I am mainly thinking that the only stuff required to include simple spatial work into the Lucene index implementation is to pull in the SpatialHepler equivalent, which adds the lon, lat and the CartesianPlotterField to the document (node, relationship, etc) being indexed. This should not break anything, and add a very simple way to get spatial functionality. I am thinking of the popularity of the MongoDB spatial extension. Not much functionality, but very easy accessible as part of a normal index operation. Question is what the API should look like in order not to add too much. I think this is so small that the help could be added to the existing index components (when someone has a bit of time :) WDYT? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Sun, Nov 14, 2010 at 12:42 AM, Christopher Schmidt fakod...@googlemail.com wrote: Hi, I think Lucene provides a simple way to do distance queries. The limit is, that you can use only points (and a circle to define a distance). No interception with lines, polylines or stuff like that is possible. If you do not need it - fine... BTW: There is currently a discussion about changing lucenes spatial implementation. See http://www.mail-archive.com/d...@lucene.apache.org/msg03593.html and http://www.mail-archive.com/d...@lucene.apache.org/msg09654.html. Mainly due to the sinusoidal projection. (and if you are interested, I did Mikes spatial example with Lucene 3.0.2 and in Scala http://blog.fakod.eu/2010/11/02/spatial-lucene-example-in-scala/) -- Christopher twitter: @fakod blog: http://blog.fakod.eu On Sat, Nov 13, 2010 at 11:05 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Hi there, I just tried the examples for searching spatial with Lucene at http://develop.nydi.ch/2010/10/lucene-spatial-example/ I am wondering if this still fits into the current Lucene framework integration, so we could add spatial indexing for simple Nodes with lat/lon properties into the existing index component, or simply have another (spatial) index backed by neo4j-lucene-index and exposed through the index framework? This is not on the level of Neo4j Spatial, but it would give a simple geo-lookup boundary for nodes or relationships. Is the support for adding the required Lucene spatial document fields already exposed so this could be added without bigger modifications to existing code? WDYT? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] what is the neo model
Hello, What is the neo model? and neo model a node can handle me like a graph, ie, I can be stored in a node type, a graph. Thank you ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
