Method testReadWriteRegression

JSAT/test/jsat/io/JSATDataTest.java:257–315

()

    }
    
    @Test
    public void testReadWriteRegression() throws Exception
    {
        System.out.println("ReadWriteRegression");
        
        
        //use the last categorical feature as the read target so that forcing as a standard dataset produces the same expected result as the original simple dataset
        RegressionDataSet rds = new RegressionDataSet(simpleData.getBackingList(), simpleData.getNumNumericalVars()-1);
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JSATData.writeData(rds, baos);
        
        ByteArrayInputStream bin = new ByteArrayInputStream(baos.toByteArray());
        
        //check classificaiton is right
        DataSet readBack = JSATData.load(bin);
        checkDataSet(rds, readBack);
        bin.reset();
        readBack = JSATData.loadRegression(bin);
        checkDataSet(rds, readBack);
        //check forcing as simple
        bin = new ByteArrayInputStream(baos.toByteArray());
        readBack = JSATData.load(bin, true);
        checkDataSet(simpleData, readBack);
        
        rds.applyTransform(new DenseSparceTransform(0.5));//sparcify our numeric values and try again
        simpleData.applyTransform(new DenseSparceTransform(0.5));
        
        baos = new ByteArrayOutputStream();
        JSATData.writeData(rds, baos);
        
        bin = new ByteArrayInputStream(baos.toByteArray());
        
        //check classificaiton is right
        readBack = JSATData.load(bin);
        checkDataSet(rds, readBack);
        bin.reset();
        readBack = JSATData.loadRegression(bin);
        checkDataSet(rds, readBack);
        //check forcing as simple
        byte[] raw_read_back = baos.toByteArray();
        bin = new ByteArrayInputStream(raw_read_back);
        readBack = JSATData.load(bin, true);
        checkDataSet(simpleData, readBack);
        
        //what if we muck the number of data points to be a negative value? indicates streaming write scenario
        raw_read_back[17] = -1;
        raw_read_back[18] = -1;
        raw_read_back[19] = -1;
        raw_read_back[20] = -1;
        bin = new ByteArrayInputStream(raw_read_back);

        readBack = JSATData.load(bin, true);

        checkDataSet(simpleData, readBack);
        
        //Check data-writer appraoch looks like mucked version of binary