Practical Machine Learning for Smarter Search with Spark+Solr
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This document discusses using Apache Spark and Apache Solr together for practical machine learning and data engineering tasks. It provides an overview of Spark and Solr, why they are useful together, and then gives an example of using them together to explore a dataset of Apache mailing list archives through data visualization, clustering, classification, and recommender systems.
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Practical Machine Learning for Smarter Search with Spark+Solr
- 1. Practical Machine Learning for Smarter Search with Solr and Spark Jake Mannix @pbrane Lead Data Engineer, Lucidworks
- 2. $ whoami Now: Lucidworks, Office of the CTO: applied ML / data engineering R&D Previously: • Allen Institute for AI: Semantic Search on academic research publications • Twitter: account search, user interest modeling, content recommendations • LinkedIn: profile search, generic entity-to-entity recommender systems Prehistory: • other software companies, algebraic topology, particle cosmology
- 3. • Why Spark and Solr for Data Engineering? • Quick intro to Solr • Quick intro to Spark • Example: ManyNewsgroups • data exploration • clustering: unsupervised ML • classification: supervised ML • recommender: collaborative filtering + content-based • search ranking Overview
- 4. Practical Data Science with Spark and Solr Why does Solr need Spark? Why does Spark need Solr?
- 5. Why do data engineering with Solr and Spark? Solr Spark • Data exploration and visualization • Easy ingestion and feature selection • Powerful ranking features • Quick and dirty classification and clustering • Simple operation and scaling • Stats and math built in • General purpose batch/streaming compute engine Whole collection analysis! • Fast, large scale iterative algorithms • Advanced machine learning: MLLib, Mahout, Deep Learning4j • Lots of integrations with other big data systems
- 6. Why does Spark need Solr? Typical Hadoop / Spark data-engineering task, start with some data on HDFS: $ hdfs dfs -ls /user/jake/mail/lucene-solr-user/2015 … -rw-r--r-- 1 jake staff 6304388 Feb 4 18:22 part-00001.lzo -rw-r--r-- 1 jake staff 7977085 Feb 4 18:22 part-00002.lzo -rw-r--r-- 1 jake staff 7210817 Feb 4 18:22 part-00003.lzo -rw-r--r-- 1 jake staff 1215048 Feb 4 18:22 part-00004.lzo Now what? What’s in these files?
- 7. Solr gives you: • random access data store • full-text search • fast aggregate statistics • just starting out: no HDFS / S3 necessary! • world-class multilingual text analytics: • no more: tokens = str.toLowerCase().split(“s+“) • relevancy / ranking • realtime HTTP service layer
- 8. • Apache Lucene • Grouping and Joins • Stats, expressions, transformations and more • Lang. Detection • Extensible • Massive Scale/Fault tolerance Solr Key Features • Full text search (Info Retr.) • Facets/Guided Nav galore! • Lots of data types • Spelling, auto-complete, highlighting • Cursors • More Like This • De-duplication
- 9. Why Spark for Solr? • Spark-shell: a Big Data REPL with all your fave JVM libs! • Build the index in parallel very, very quickly! • Aggregations • Boosts, stats, iterative global computations • Offline compute to update index with additional info (e.g. PageRank, popularity) • Whole corpus analytics and ML: clustering, classification, CF, rankers • General-purpose distributed computation • Joins with other storage (Cassandra, HDFS, DB, HBase)
- 10. Spark Key Features • General purpose, high powered cluster computing system • Modern, faster alternative to MapReduce • 3x faster w/ 10x less hardware for Terasort • Great for iterative algorithms • APIs for Java, Scala, Python and R • Rich set of add-on libraries for machine learning, graph processing, integrations with SQL and other systems • Deploys: Standalone, Hadoop YARN, Mesos, AWS, Docker, …
- 11. • Initial exploration of ASF mailing-list archives • Index it into Solr • Explore a bit deeper: unsupervised Spark ML • Exploit labels: predictive analytics Example: Many NewsGroups
- 12. • Initial exploration of ASF mailing-list archives • index into Solr: just need to turn your records into json • facet: • fields with low cardinality or with sensible ranges • document size histogram • projects, authors, dates • find: broken fields, automated content, expected data missing, errors • now: load into a spark RDD via SolrRDD: Many NewsGroups: Initial Exploration
- 13. • cleanup/filtering via spark DataFrame operations: • create thread groups: Many NewsGroups: Initial Exploration
- 14. • try other text analyzers: (no more str.split(“w+”)! ) Many NewsGroups: Initial Exploration ref: Lucidworks blog on LuceneTextAnalyzer by Steve Rowe
- 15. • Unsupervised machine learning: • clustering documents with KMeans • extract topics with Latent Dirichlet Allocation • learn word vectors with Word2Vec Many NewsGroups: Exploratory Data Science
- 16. • Vectorize and run KMeans: Many NewsGroups: Exploratory Data Science
- 17. • Build topic models with LDA: Many NewsGroups: Exploratory Data Science
- 18. • Build word vector representations with Word2Vec: Many NewsGroups: Exploratory Data Science
- 19. • Now for some real Data Science: Many NewsGroups: Supervised Learning
- 20. • What else could you do? • Try other classification algs, cross-validate to pick! • Recommender Systems • content-based: • mail-thread as “item”, head msgs grouped by replier as “user” profile • search query of users against items to recommend • collaborative-filtering: • users replying to a head msg “rate” them +-tively • train a Spark ML ALS RecSys model • Train search rankers in click logs Many NewsGroups: Next steps?
- 21. Resources • spark-solr: https://github.com/Lucidworks/spark-solr • Company: http://www.lucidworks.com • Our blog: http://www.lucidworks.com/blog • Apache Solr: http://lucene.apache.org/solr • Apache Spark: http://spark.apache.org • Fusion: http://www.lucidworks.com/products/fusion • Twitter: @pbrane
Editor's Notes
- I live at the intersection of information retrieval and machine learning, and the scalable / distributed systems engineering to enable them
- Two open source Apache projects: Solr is a fantastically scalable, production-grade search engine Spark is a high-performance, flexible distributed computation engine
- Download one? These aren’t big, but sometimes each chunk *is* big. These are moderately human-readable (after decompress), so you could “hdfs cat” them, but often it’s binary: parquet/avro/thrift/protobufs. Maybe you can “hdfs cat” them, too… but you want to explore, tinker, see what ugly rough edges there are.
- No HDFS means no NameNode SPOF, no need for HA NN, Ops to go with that.
- faceting does global reads / stats, but is “just counting”
- overview: buildVectorizer runs word count, filters out ultra-rare and too freq words, builds a dictionary with IDF values in it vectorize: applies the vectorizer as a UDF to make a vector field buildKMeansModel: runs kMeans over the vectors
- next slide: w2v - sooooooo much code! ;P
- this model may be applied to data you have that doesn’t have labels it may also be serialized, and loaded up into a service layer (plug for Fusion) Remember: just index these modified DataFrames back into Solr and take a peek at them!