This document proposes CSMR, a scalable algorithm for text clustering that uses cosine similarity and MapReduce. CSMR performs pairwise text similarity by representing text documents as vectors in a vector space model and measuring similarity in parallel using MapReduce. It is a 4-phase algorithm that includes word counting, text vectorization using term frequencies, applying TF-IDF to document vectors, and measuring cosine similarity. The algorithm is designed to cluster large text corpora in a scalable manner on distributed systems like Hadoop. Future work includes implementing and testing CSMR on real data and publishing results.
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Currently extracting overlapping grams from string and consider
only string that share certain gram as candidate. Now we propose
extracting non-overlapping substring or chunk from string.
Chunk scheme based on tail-restricted chunk boundary
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based method. Greedy algorithm automatically select good
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method occupies less space and faster performance to compute
the value
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International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
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Vchunk join an efficient algorithm for edit similarity joinsVijay Koushik
Similarity join is most important technique to
involve many applications such as data integration, record
linkage and pattern recognition. Here we introduce new
algorithm for similarity join with edit distance constraints.
Currently extracting overlapping grams from string and consider
only string that share certain gram as candidate. Now we propose
extracting non-overlapping substring or chunk from string.
Chunk scheme based on tail-restricted chunk boundary
dictionary (CBD). This approach integrated existing approach
for calculating similarity with several new filters unique to chunk
based method. Greedy algorithm automatically select good
chunking scheme from given data set. Then show the result our
method occupies less space and faster performance to compute
the value
Web clustering Engines are emerging trend in the field of data retrieval. They organize search results by topic, thus providing a complementary view to the flat ranked list returned by the standard search engines.
Text Categorization Using Improved K Nearest Neighbor AlgorithmIJTET Journal
Abstract— Text categorization is the process of identifying and assigning predefined class to which a document belongs. A wide variety of algorithms are currently available to perform the text categorization. Among them, K-Nearest Neighbor text classifier is the most commonly used one. It is used to test the degree of similarity between documents and k training data, thereby determining the category of test documents. In this paper, an improved K-Nearest Neighbor algorithm for text categorization is proposed. In this method, the text is categorized into different classes based on K-Nearest Neighbor algorithm and constrained one-pass clustering, which provides an effective strategy for categorizing the text. This improves the efficiency of K-Nearest Neighbor algorithm by generating the classification model. The text classification using K-Nearest Neighbor algorithm has a wide variety of text mining applications.
A Novel Multi- Viewpoint based Similarity Measure for Document ClusteringIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
This is very simple introduction to Clustering with some real world example. At the end of lecture I use stackOverflow API to test some clustering. I also wants to try facebook but it has some problem with it's API
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References
Crane, Gregory, Brent Seales, and Melissa Terras. 2009. “Cyberinfrastructure for Classical Philology.” Digital Humanities Quarterly 3.
Romanello, Matteo. 2011. “New Value-Added Services for Electronic Journals in Classics.” JLIS.it 2. doi:10.4403/jlis.it-4603.
Romanello, Matteo, Federico Boschetti, and Gregory Crane. 2009. “Citations in the digital library of classics: extracting canonical references by using conditional random fields.” In , 80–87. Morristown, NJ, USA: Association for Computational Linguistics.
Smith, Neel. 2010. “Digital Infrastructure and the Homer Multitext Project.” In Digital Research in the Study of Classical Antiquity, ed. Gabriel Bodard and Simon Mahony, 121–137. Burlington, VT: Ashgate Publishing.
Unsworth, John. 2000. “Scholarly Primitives: what methods do humanities researchers have in common, and how might our tools reflect this?.” http://www3.isrl.illinois.edu/~unsworth/Kings.5-00/primitives.html.
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the homogeneity and data locality assumptions are not satisfied
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Silicon Valley Cloud Computing Meetup
Mountain View, 2010-07-19
Examples of Hadoop Streaming, based on Python scripts running on the AWS Elastic MapReduce service, which show text mining on the "Enron Email Dataset" from Infochimps.com plus data visualization using R and Gephi
Source at: http://github.com/ceteri/ceteri-mapred
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https://www.pramati.com/
https://blog.imaginea.com/
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CSMR: A Scalable Algorithm for Text Clustering with Cosine Similarity and MapReduce
1. CSMR: A Scalable Algorithm for
Text Clustering with Cosine
Similarity and MapReduce
Giannakouris – Salalidis Victor - Undergraduate Student
Plerou Antonia - PhD Candidate
Sioutas Spyros - Associate Professor
2. Introduction
• Big Data: Massive amount of data as a result of the huge
rate of growth
• Big Data need to be faced in various domains: Business
Intelligence, Bioinformatics, Social Media Analytics etc.
• Text Mining: Classification/Clustering in digital libraries,
e-mail, Sentiment Analysis on Social Media
• CSMR: Performs pairwise text similarity, represents text
data in a vector space and measures similarity in parallel
manner using MapReduce
3. Background
• Vector Space Model: An algebraic model for representing
text documents as vectors
• Efficient method for text similarity measurement
4. TF-IDF
• Term Frequency – Inverse Document Frequency
• A numerical statistic that reflects the significance of a
term in a corpus of documents
• Usually used in search engines, text mining, text
similarity in the vector space
푇퐹 × 퐼퐷퐹 =
푛푖,푗
푡 ∈ 푑푗
× 푙표푔
|퐷|
|푑 ∈ 퐷: 푡 ∈ 푑|
5. Cosine Similarity
• Cosine Similarity: A measure of similarity between two
documents represented as vector
• Measuring of the angle between two vectors
A B A
B
1
1 2 2
A
B
1 1
cos(A,B)
|| A|| || B||
( ) ( )
n
i i
n
i
i i
i i
6. Hadoop
• Framework developed by Apache
• Large-Scale Data Processing and Analytics
• Scalable and parallel processing of data on large
computer clusters using MapReduce
• Runs on commodity, low-end hardware
• Main Components: HDFS (Hadoop Distributed File
System), MapReduce
• Currently used by: Adobe, Yahoo!, Amazon, eBay,
Facebook and many other companies
7. MapReduce
• Programming Paradigm running on Apache Hadoop
• The main component of Hadoop
• Useful for processing of large data-sets
• Breaks the data into key-value pairs
• Model derived from map and reduce functions of
Functional Programming
• Every MR program constitutes of Mappers and Reducers
9. CSMR
• The purposed method, CSMR combines all the above
mentioned techniques
• Scalable Algorithm for text clustering using MapReduce model
• Applies MR model on TF-IDF and Cosine Similarity
• 4 Phases:
1. Word Counting
2. Text Vectorization using term frequencies
3. Apply TF-IDF on document vectors
4. Cosine Similarity Measurement
10. Phase 1: Word Counting
Algorithm 1: Word Count
1: class Mapper
2: method Map( document )
3: for each term ∈ document
4: write ( ( term , docId ) , 1 )
5:
6: class Reducer
7: method Reduce( ( term , docId ) , ones[ 1 , 1 , … , n ] )
8: sum = 0
9: for each one ∈ ones do
10: sum = sum +1
11: return ( ( term , docId ) , o )
12:
13: /* { o ∈ N : the number of occurrences } */
11. Phase 2: Term Frequency
Algorithm 2: Term Frequency
1: class Mapper
2: method Map( ( term , docId ) , o )
3: for each element ∈ ( term , docId )
4: write ( docId, ( term, o ) )
5:
6: class Reducer
7: method Reduce( docId, (term, o) )
8: N = 0
9: for each tuple ∈ ( term, o ) do
10: N = N + o
return ( (docId, N), (term, o) )
12. Phase 3: TF-IDF
Algorithm 3: Tf-Idf
1: class Mapper
2: method Map( ( docId , N ), ( term , o ) )
3: for each element ∈ ( term , o )
4: write ( term, ( docId, o, N ) )
5:
6: class Reducer
7: method Reduce( term, ( docId , o , N ) )
8: n = 0
9: for each element ∈ ( docId , o , N ) do
10: n = n + 1
11: tf = o / N
12: idf = log|D| /(1n)
13: return ( docId, ( term , tf×idf ) )
14:
15: /* Where |D| is the number of documents in the corpus */
13. Phase 4: Cosine Similarity
Algorithm 4: Cosine Similarity
1: class Mapper
2: method Map( docs )
3: n = docs.length
4:
5: for i = 0 to docs.length
6: for j = i+1 to docs.length
7: write ( ( docs[i].id, docs[j].id ),( docs[i].tfidf, docs[j].tfidf ) )
8:
9: class Reducer
10: method Reduce( ( docId_A, docId_B ),( docA.tfidf, docB.tfidf ) )
11: A = docA.tfidf
12: B = docB.tfidf
13: cosine = sum( A×B )/ (sqrt( sum(A2) )× sqrt( sum(B2) ))
14: return ( (docId_A, docId_B), cosine )
15. Conclusions & Future Work
• Finalized proposed method
• Implementation of the method
• Experimental tests on real data and computer clusters
• Deployment of an open-source project
• Additional implementation using more efficient tools such
as Apache Spark and Scala
• Publication of test results