Use SVM Perf

This page describes a procedure that enables SVM Perf classifier (svm_perf_classify) to be used with RaSC.

SVM Perf must be changed at a program level to perform input and output through file (the changes are described with CRF++ as an example in How can I modify existing user programs to run them on RaSC?). The following describes a procedure to change the program by applying a patch to it so that SVM Perf may be used as an RaSC service.

First, get the SVM Perf source code.

$ wget http://download.joachims.org/svm_perf/current/svm_perf.tar.gz
$ mkdir svm_perf
$ tar zxvf svm_perf.tar.gz -C svm_perf

Create new files necessary to apply a patch.

$ touch svm_perf/svm_light/svm_classify_stdin.c
$ touch svm_perf/svm_struct/svm_struct_classify_stdin.c

Then, get the patch file.

$ wget https://alaginrc.nict.go.jp/rasc/resources/patch_rasc_svm_perf.diff

Then, apply the patch.

$ patch -p0 < patch_rasc_svm_perf.diff

Then, build SVM Perf.

$ cd svm_perf
$ ./configure
$ make

These commands produce the executable binary svm_perf_classify_stdin, which has been modified so that it can be used with RaSC.

In a service definition XML, describe a start command line that includes the path to and the model file of the executable binary (you can download service XML)．Modify ___SVM_PERF_DIR___ and ___PATH_TO_MODEL_FILE___ to the directory that actually includes svm_perf_classify_stdin and the path to the model file.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
  <bean id="target"
    class="jp.go.nict.langrid.servicecontainer.handler.TargetServiceFactory">
    <property name="service">
      <bean class="jp.go.nict.wisdom.wrapper.StdIOCommandService">
        <property name="cmdLine" value="___SVM_PERF_DIR___/svm_perf_classify_stdin ___PATH_TO_MODEL_FILE___" />
        <property name="delimiterIn" value="\n[END_OF_INPUT]\n" />
        <property name="delimiterOut" value="EOS\n" />
        <property name="delLastNewline" value="true" />
      </bean>
    </property>
  </bean>
</beans>

• For cmdLine, specify the path to SVM that was created before by applying the patch, and the model file to be read in.
• For delimiterIn, describe \n[END_OF_INPUT]\n because the patch has been applied to set the input delimiting character string to [END_OF_INPUT].
• Similarly, for delimiterOut, describe EOS\n because the patch has been applied to set the output delimiting character string to EOS\n.
• Within the program, \n in this example will be replaced with an appropriate linefeed code suitable for each system.

For information on the procedure to start the service, refer to Run a user program as a RaSC service or Work with various network protocols.