Big Graph Search: Challenges and Techniques. Shuai Ma. Graphs are everywhere , and quite a few are huge graphs!. Application Scenarios. Software plagiarism detection . Traditional plagiarism detection tools may not be applicable for serious software plagiarism problems.
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Challenges and Techniques
Graphs are everywhere, and quite a few are huge graphs!
Software plagiarism detection 
Recommender systems 
Transport routing 
Biological data analysis 
A unified definition  (in the name of graph matching):
Different semantics of “match” implies different “types” of graph search, including, but not limited to, the following:
Graph search is a very ‘‘ general’’ concept!
Facebook launched “graph search” on 16th January, 2013
Assault on Google, Yelp, and LinkedIn with new graph search;
Yelp was down more than 7%
World Wide Web
Graph search is a new paradigm for social computing!
Find the name of all of
Step 1: The person.name index -> the identifier of Alberto Pepe. [O(log2n)]
Step 2: The friend.person index -> k friend identifiers. [O(log2x) : x<<m]
Step 3:The k friend identifiers -> k friend names. [O(k log2n)]
Find the name of all of
Step 1: The vertex.name index -> the vertex with the name Alberto Pepe. [O(log2n)]
Step 2:The vertex returned -> the k friend names. [O(k + x)]
it’s interesting, and over the last 10 years, people have been trained on how to use search engines more effectively.
Keywords & Search In 2013: Interview With A. Goodman & M. Wagner
International Conference on Application of Natural Language to Information Systems (NLDB) started from 1995
DB people started working on graphs at around the same time！
Graph search with high efficiency, striking a balance between its performance and accuracy.
Consider the dynamic changes and timing characteristics of data.
Solve the data quality problems.
Key ideas：For a class Q of queries with a high computational complexity, find another class Q’ of queries that has a lower computational complexity with bounded quality loss for query answering.
Challenge: balancing the expressive power and computational complexity!
Shuai Ma, Yang Cao, Wenfei Fan, JinpengHuai, and TianyuWo. Strong Simulation: Capturing Topology in Graph Pattern Matching. TODS 2014.
Shuai Ma, Yang Cao, Wenfei Fan, JinpengHuai, and TianyuWo. Capturing Topology in Graph Pattern Matching. VLDB 2012.
Keep exact structure topology between Q and Gs
May return exponential many matched subgraphs
In certain scenarios, too restrictive to find matches
These hinder the usability in emerging applications, e.g., social networks
Subgraph isomorphism (NP-complete) vs. graph simulation (O(n2))!
Set up a team to develop a new software product
Graph simulation returns F3, F4 and F5;
Subgraph isomorphism returns empty!
Subgraph isomorphism is too strict for emerging applications
“Those who were trained to fly didn’t know the others. One group of people did not know the other group.” (Osama Bin Laden, 2001)
Balance between complexity and the capability to capturing topology!
Strong simulation: bring duality and locality into graph simulation
Topology preservation and bounded matches
It is NOT practical to handle large graphs on single machines
Distributed graph processing is inevitable
Model of Computation :
Shuai Ma, Yang Cao, JinpengHuai, and TianyuWo. Distributed Graph Pattern Matching. WWW 2012.
Q(D + Δ)
Q(D) + Q(Δ)
G. Ramalingam, Thomas W. Reps: A Categorized Bibliography on Incremental Computation. POPL 1993: 502-510
Wenfei Fan, Jianzhong Li, Shuai Ma, Nan Tang, Yinghui Wu, and Yunpeng Wu. Graph Pattern Matching: From Intractable to Polynomial Time. VLDB 2010
Google Percolator :
It is a terrible waste to compute everything from scratch!
Michael I. Jordan: Divide-and-conquer and statistical inference for big data. KDD 2012: 4
Wenfei Fan, FlorisGeerts, Frank Neven: Making Queries Tractable on Big Data with Preprocessing. VLDB 2013
Weiren Yu, Charu Aggarwal, Shuai Ma, and Haixun Wang. On Anomalous Hotspot Discovery in Graph Streams. ICDM 2013
Wenfei Fan, Jianzhong Li, Xin Wang, Yinghui Wu: Query preserving graph compression. SIGMOD, 2012
Q(D1) + … +Q(Dn)
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We have introduced graph search: a new paradigm for social computing
We have also briefly discussed the challenges of graph search
We have presented some useful techniques towards solving the problems
A long way to go for big graph search!
Address: Room G1122,
New Main Building,
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Dr. Shuai Ma