How to disable the console output in libsvm (java)

问题

I am using libsvm in java and am experiencing similar issues as described here for python.

I am getting a lot of console output during training and prediction and would like to disable it. Sadly, due to a "Service Temporary Unavaiable" I can't access the website, where it might be described (here). I couldn't find a java related way to disable this warnings (If I did oversee something I apologize)

The Output always looks quite similar to this:

optimization finished, #iter = 10000000 nu = 0.013178458659415372 obj = -11.005078334927212, rho = -2.1799731001804696 nSV = 20, nBSV = 5 Total nSV = 20

Do you know how I can disable this kind of output in java?

Thanks a lot for your help.

回答1:

To disable output programmatically you need to do the following:

svm.svm_set_print_string_function(new libsvm.svm_print_interface(){
    @Override public void print(String s) {} // Disables svm output
});

回答2:

At the command line just use the -q option.

$ ./svm-train 
Usage: svm-train [options] training_set_file [model_file]
options:
-s svm_type : set type of SVM (default 0)
   *** lots of stuff cut out...
-q : quiet mode (no outputs)

If you have your own java trainer, set the print_func for you svm_print_null. (I think the only way to do this is to with the svm_train class is by passing "-q" with your other parameters into the main method).

Hope it helps

回答3:

To disable libsvm output in terminal for Java I use:

import java.io.PrintStream;
import java.io.OutputStream;
System.setOut(new PrintStream(new OutputStream() {
      @Override public void write(int b) throws IOException {}
    }));

Keep in mind the output to the terminal is disabled, but a logger can be used instead which does output:

import org.apache.log4j.Logger;
private static final Logger LOG = Logger.getLogger(YourClass.class);

Place the log4j.properties file in your resources folder.

The log4j.properties file may look like the following:

#info,debug, error,fatal ...
log4j.rootLogger=debug,stdout

#console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

来源：https://stackoverflow.com/questions/24370987/how-to-disable-the-console-output-in-libsvm-java

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java

machine-learning

classification

svm

libsvm