raku-Algorithm-LibSVM

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raku-Algorithm-LibSVM

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A Raku bindings for libsvm

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NAME
====

Algorithm::LibSVM - A Raku bindings for libsvm

SYNOPSIS
========

EXAMPLE 1
---------

use Algorithm::LibSVM;
    use Algorithm::LibSVM::Parameter;
    use Algorithm::LibSVM::Problem;
    use Algorithm::LibSVM::Model;

my $libsvm = Algorithm::LibSVM.new;
    my Algorithm::LibSVM::Parameter $parameter .= new(svm-type => C_SVC,
                                                      kernel-type => RBF);
    # heart_scale is here: https://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/binary/heart_scale
    my Algorithm::LibSVM::Problem $problem = Algorithm::LibSVM::Problem.from-file('heart_scale');
    my @r = $libsvm.cross-validation($problem, $parameter, 10);
    $libsvm.evaluate($problem.y, @r).say; # {acc => 81.1111111111111, mse => 0.755555555555556, scc => 1.01157627463546}

EXAMPLE 2
---------

use Algorithm::LibSVM;
    use Algorithm::LibSVM::Parameter;
    use Algorithm::LibSVM::Problem;
    use Algorithm::LibSVM::Model;

sub gen-train {
      my $max-x = 1;
      my $min-x = -1;
      my $max-y = 1;
      my $min-y = -1;
      my @x;
      my @y;
      do for ^300 {
          my $x = $min-x + rand * ($max-x - $min-x);
          my $y = $min-y + rand * ($max-y - $min-y);

my $label = do given $x, $y {
              when ($x - 0.5) ** 2 + ($y - 0.5) ** 2 <= 0.2 {
                  1
              }
              when ($x - -0.5) ** 2 + ($y - -0.5) ** 2 <= 0.2 {
                  -1
              }
              default { Nil }
          }
          if $label.defined {
              @y.push: $label;
              @x.push: [$x, $y];
          }
      }
      (@x, @y)
    }

my (@train-x, @train-y) := gen-train;
    my @test-x = 1 => 0.5e0, 2 => 0.5e0;
    my $libsvm = Algorithm::LibSVM.new;
    my Algorithm::LibSVM::Parameter $parameter .= new(svm-type => C_SVC,
                                                      kernel-type => LINEAR);
    my Algorithm::LibSVM::Problem $problem = Algorithm::LibSVM::Problem.from-matrix(@train-x, @train-y);
    my $model = $libsvm.train($problem, $parameter);
    say $model.predict(features => @test-x)<label> # 1

DESCRIPTION
===========

Algorithm::LibSVM is a Raku bindings for libsvm.

METHODS
-------

### cross-validation

Defined as:

method cross-validation(Algorithm::LibSVM::Problem $problem, Algorithm::LibSVM::Parameter $param, Int $nr-fold --> List)

Conducts `$nr-fold`-fold cross validation and returns predicted values.

### train

Defined as:

method train(Algorithm::LibSVM::Problem $problem, Algorithm::LibSVM::Parameter $param --> Algorithm::LibSVM::Model)

Trains a SVM model.

* `$problem` The instance of Algorithm::LibSVM::Problem.

* `$param` The instance of Algorithm::LibSVM::Parameter.

### **DEPRECATED** load-problem

Defined as:

multi method load-problem(\lines --> Algorithm::LibSVM::Problem)
    multi method load-problem(Str $filename --> Algorithm::LibSVM::Problem)

Loads libsvm-format data.

### load-model

Defined as:

method load-model(Str $filename --> Algorithm::LibSVM::Model)

Loads libsvm model.

### evaluate

Defined as:

method evaluate(@true-values, @predicted-values --> Hash)

Evaluates the performance of the three metrics (i.e. accuracy, mean squared error and squared correlation coefficient)

* `@true-values` The array that contains ground-truth values.

* `@predicted-values` The array that contains predicted values.

### nr-feature

Defined as:

method nr-feature(--> Int:D)

Returns the maximum index of all the features.

ROUTINES
--------

### parse-libsvmformat

Defined as:

sub parse-libsvmformat(Str $text --> List) is export

Is a helper routine for handling libsvm-format text.

CAUTION
=======

DON'T USE `PRECOMPUTED` KERNEL
------------------------------

As a workaround for [RT130187](https://rt.perl.org/Public/Bug/Display.html?id=130187), I applied the patch programs (e.g. [src/3.22/svm.cpp.patch](src/3.22/svm.cpp.patch)) for the sake of disabling random access of the problematic array.

Sadly to say, those patches drastically increase the complexity of using `PRECOMPUTED` kernel.

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