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package Algorithm::LBFGS; |
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use strict; |
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use warnings; |
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use XSLoader; |
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our $VERSION = '0.16'; |
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XSLoader::load('Algorithm::LBFGS', $VERSION); |
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# constructor |
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sub new { |
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my $class = shift; |
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my %param = @_; |
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my $self = bless { param => create_lbfgs_param() }, $class; |
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$self->set_param(%param); |
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return $self; |
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} |
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# destructor |
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sub DESTROY { |
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my $self = shift; |
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destroy_lbfgs_param($self->{param}); |
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} |
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# set parameters |
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sub set_param { |
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my $self = shift; |
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my %param = @_; |
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set_lbfgs_param($self->{param}, $_, $param{$_}) for keys %param; |
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} |
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# get parameters |
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sub get_param { |
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my $self = shift; |
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my $name = shift; |
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return set_lbfgs_param($self->{param}, $name, undef); |
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} |
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# verbose monitor |
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my $verbose_monitor = sub { |
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my ($x, $g, $fx, $xnorm, $gnorm, $step, $k, $ls, $user_data) = @_; |
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($fx, $xnorm, $gnorm, $step) = |
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map { sprintf("%g", $_) } ($fx, $xnorm, $gnorm, $step); |
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my $hr = "=" x 79; |
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my $s = ":"; |
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print <
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Iteration $k |
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$hr |
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f(x) $s $fx |
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|| x || $s $xnorm |
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|| grad f(x) || $s $gnorm |
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line search step $s $step |
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evaluations num $s $ls |
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MSG |
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return 0; |
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}; |
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# logging monitor |
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my $logging_monitor = sub { |
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my ($x, $g, $fx, $xnorm, $gnorm, $step, $k, $ls, $user_data) = @_; |
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push @$user_data, { |
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x => $x, g => $g, fx => $fx, xnorm => $xnorm, gnorm => $gnorm, |
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step => $step, k => $k, ls => $ls, user_data => $user_data |
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}; |
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return 0; |
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}; |
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# do optimization |
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sub fmin { |
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my $self = shift; |
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my ($lbfgs_eval, $x0, $lbfgs_prgr, $user_data) = @_; |
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if (defined($lbfgs_prgr)) { |
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1
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$lbfgs_prgr = $verbose_monitor if ($lbfgs_prgr eq 'verbose'); |
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1
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$lbfgs_prgr = $logging_monitor if ($lbfgs_prgr eq 'logging'); |
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} |
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my $instance = |
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create_lbfgs_instance($lbfgs_eval, $lbfgs_prgr, $user_data); |
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$self->{status} = status_2pv(do_lbfgs($self->{param}, $instance, $x0)); |
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destroy_lbfgs_instance($instance); |
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return $x0; |
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} |
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# query status |
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sub get_status { |
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my $self = shift; |
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return $self->{status}; |
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} |
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0
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sub status_ok { return get_status(@_) == 0; } |
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93
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1; |
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__END__ |