Data Mining with JDM API by Regina Wang (4/11)

Data Mining with JDM API Regina Wang

Data Mining Knowledge-Discovery in Databases (KDD) Searching large volumes of data for patterns. The nontrivial extraction of implicit, previously known, and potentially useful information from data. The science of extracting useful information from large data sets or databases. Uses computational techniques from statistics, machine learning, and pattern recognition .

Descriptive Statistics Collect data Classify data Summarize data present data Make inferences to draw a conclusions --Point and interval estimation --Hypothesis testing --Prediction

Machine Learning Concerned with the development of techniques which allow computers to "learn". Concerned with the algorithmic complexity of computational implementations. Many inference problems turn out to be NP-hard or harder .

Common Machine Learning Algorithm Supervised learning—prior knowledge Unsupervised learning—statistical regularity of the patterns Semi-supervised learning Reinforcement learning Transduction Learning to learn

Pattern Recognition The act of taking in raw data and taking an action based on the category of the data. Aims to classify data patterns based on prior knowledge or on statistical info. Based on availability of training set: supervised and unsupervised leanings Two approaches: statistical (decision theory) and syntactic (structural).

Supervised Techniques Classification: -- k -Nearest Neighbors --Naïve Bayes --Classification Trees --Descriminant Analysis --Logistic Regression --Neural Nets

Supervised Techniques Prediction (Estimation): --Regression --Regression Trees -- k -Nearest Neighbors

Unsupervised Techniques Cluster Analysis Principle Components Association Rules Collaborative Filtering

Data-mining tools were traditionally provided in products with vendor-specific interfaces. The Java Data Mining API (JDM) defines a common Java API to interact with data-mining systems. Developed by Java Community Data Mining Expert Group JAVA Data Mining API (JDM)

JDM Current Versions JDM 1.0 (JSR 73) final specification in August, 2004 http:// www.jcp.org/en/jsr/detail?id =73 JDM 2.0 (JSR 247) Early Review http:// www.jcp.org/en/jsr/detail?id =247 JDM is for the Java™ 2 Platform (J2EE™) and (J2SE™)

Data Mining System A typical data-mining system consists of --a data-mining engine --a repository that persists the data-mining artifacts, such as the models, created in the process. The actual data is obtained via a database connection, or via a file-system API.

JDM Architectural components Application programming interface (API) Data mining engine (DME) – or data mining server (DMS), provides the infrastructure that offers a set of data mining services to its API clients. Mining object repository (MOR) - The DME uses a mining object repository which serves to persist data mining objects

Key JDM API benefit : abstracts out the physical components, tasks, and algorithms to java classes Figure 1. Components of a data-mining system

Building a data-mining model Decide what you want to learn. Select and prepare your data. Choose mining tasks and configure the mining algorithms. Build your data-mining model. Test and refine the models. Report findings or predict future outcomes.

Data Mining Process Figure 2. Data mining steps.

Usage of JDM API Using JDM to explore mining object repository (MOR) and find out what models and model building parameters work best. Follow a few simple steps that map the process to JDM interactions. Build Java Data Mining GUI Application

Figure 3. Top level packages. Figure 4. Top level interfaces.

Figure 4. Top level interfaces.

Using the JDM API Identify the data you wish to use to build your model—your build data —with a URL that points to that data. Specify the type of model you want to build, and parameters to the build process. Such parameters are termed build settings in JDM. such as clustering, classification, or association rules. These tasks are represented by API classes. Create a logical representation of your data to select certain attributes of the physical data, and then map those attributes to logical values.

Using the JDM API Specify the parameters to your data-mining algorithms Create a build task , and apply to that task the physical data references and the build settings. Finally, you execute the task . The outcome of that execution is your data model. That model will have a signature —a kind of interface—that describes the possible input attributes for later applying the model to additional data.

Using data model and results Once you've created a model, you can test that model, and then even apply the model to additional data. Building, testing, and applying the model to additional data is an iterative process that, ideally, yields increasingly accurate models. Those models can then be saved in the MOR, and used to either explain data, or to predict the outcome of new data in relation to your data-mining objective.

JDM Data Connection A JDM connection is represented by the engine variable, which is of type javax.datamining.resource.Connection. JDM connections are very similar to JDBC connections, with one connection per thread. PhysicalDataSetFactory dataSetFactory = (PhysicalDataSetFactory) engine.getFactory("javax.datamining.data.PhysicalDataSet");

JDM Data Connection Build data is referenced via a PhysicalDataSet object, which, in turn, loads the data from a file or a database table, referenced with a URL. PhysicalDataSet dataSet = pdsFactory.create( "file:///export/data/textFileData.data", true);

Code Example: Building a clustering model // Create the physical representation of the data (1) PhysicalDataSetFactory pdsFactory = (PhysicalDataSetFactory) dme- Conn.getFactory( “javax.datamining.data.PhysicalDataSet” ); (2) PhysicalDataSet buildData = pdsFactory.create( uri, true ); (3) dmeConn.saveObject( “myBuildData”, buildData, false ); // Create the logical representation of the data from physical data (4) LogicalDataFactory ldFactory = (LogicalDataFactory) dmeConn.getFactory( “ javax.datamining.data.LogicalData” ); (5) LogicalData ld = ldFactory.create( buildData ); (6) dmeConn.saveObject( “myLogicalData”, ld, false ); // Create the settings to build a clustering model (7) ClusteringSettingsFactory csFactory = (ClusteringSettingsFactory) dme- Conn.getFactory( “javax.datamining.clustering.ClusteringSettings”); (8) ClusteringSettings clusteringSettings = csFactory.create(); (9) clusteringSettings.setLogicalDataName( “myLogicalData” ); (10) clusteringSettings.setMaxNumberOfClusters( 20 );

Code Example: Building a clustering model con’t (11) clusteringSettings.setMinClusterCaseCount( 5 ); (12) dmeConn.saveObject( “myClusteringBS”, clusteringSettings, false ); // Create a task to build a clustering model with data and settings (13) BuildTaskFactory btFactory = (BuildTaskFactory) dmeConn.getFactory( “ javax.datamining.task.BuildTask” ); (14) BuildTask task = btFactory.create( “myBuildData”, “myClusteringBS”, “ myClusteringModel” ); (15) dmeConn.saveObject( “myClusteringTask”, task, false ); // Execute the task and check the status (16) ExecutionHandle handle = dmeConn.execute( “myClusteringTask” ); (17) handle.waitForCompletion( Integer.MAX_VALUE ); // wait until done (18) ExecutionStatus status = handle.getLatestStatus(); (19) if( ExecutionState.success.equals( status.getState() ) ) (20) // task completed successfully...

References Java Data Mining Specification http://www.jcp.org/en/jsr/detail?id=73 Mine Your Own Data with the JDM API, Frank Sommers, July 7, 2005 http://www.artima.com/lejava/articles/data_mining.html http://www.stanford.edu/class/cs345a/#handouts

Data Mining with JDM API by Regina Wang (4/11)

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Data Mining with JDM API by Regina Wang (4/11)