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lib/AI/NNEasy/NN/backprop.pm  view on Meta::CPAN

    my $CLASS = ref($this) || __PACKAGE__ ;
    my $outputPatternRef = shift(@_) ;
    
    my $outputLayer = $this->{layers}->[-1]->{nodes} ;

    my $sqrErr ;
    my $counter = 0 ;
    foreach my $node (@$outputLayer) {
      $sqrErr += ($node->{activation} - $$outputPatternRef[$counter])**2 ;
      ++$counter ;
    }

    my $error = sqrt($sqrErr) ;

    return $error;
  }
  
  

my $INLINE_INSTALL ; BEGIN { use Config ; my @installs = ($Config{installarchlib} , $Config{installprivlib} , $Config{installsitelib}) ; foreach my $i ( @installs ) { $i =~ s/[\\\/]/\//gs ;} $INLINE_INSTALL = 1 if ( __FILE__ =~ /\.pm$/ && ( join(" ",...

use Inline C => <<'__INLINE_C_SRC__' , ( $INLINE_INSTALL ? (NAME => 'AI::NNEasy::NN::backprop' , VERSION => '0.06') : () ) ;


#define OBJ_HV(self)		(HV*) SvRV( self )
#define OBJ_AV(self)		(AV*) SvRV( self )

#define FETCH_ATTR(hv,k)	*hv_fetch(hv, k , strlen(k) , 0)
#define FETCH_ATTR_PV(hv,k)	SvPV( FETCH_ATTR(hv,k) , len)
#define FETCH_ATTR_NV(hv,k)	SvNV( FETCH_ATTR(hv,k) )
#define FETCH_ATTR_IV(hv,k)	SvIV( FETCH_ATTR(hv,k) )  
#define FETCH_ATTR_HV(hv,k)	(HV*) FETCH_ATTR(hv,k)
#define FETCH_ATTR_AV(hv,k)	(AV*) FETCH_ATTR(hv,k)
#define FETCH_ATTR_HV_REF(hv,k)	(HV*) SvRV( FETCH_ATTR(hv,k) )
#define FETCH_ATTR_AV_REF(hv,k)	(AV*) SvRV( FETCH_ATTR(hv,k) )

#define FETCH_ELEM(av,i)		*av_fetch(av,i,0)
#define FETCH_ELEM_HV_REF(av,i)	(HV*) SvRV( FETCH_ELEM(av,i) )
#define FETCH_ELEM_AV_REF(av,i)	(AV*) SvRV( FETCH_ELEM(av,i) )

void hiddenToOutput_c( SV* self ) {
    STRLEN len;
    int i , j , k ;
    HV* self_hv = OBJ_HV( self );
        
    AV* nodes = FETCH_ATTR_AV_REF( FETCH_ELEM_HV_REF( FETCH_ATTR_AV_REF(self_hv , "layers") , -1) , "nodes") ;
    for (i = 0 ; i <= av_len(nodes) ; ++i) {
      HV* node = OBJ_HV( *av_fetch(nodes, i ,0) ) ;

      AV* westNodes = FETCH_ATTR_AV_REF( FETCH_ATTR_HV_REF(node , "connectedNodesWest") , "nodes") ;
      for (j = 0 ; j <= av_len(westNodes) ; ++j) {
        HV* connectedNode = OBJ_HV( *av_fetch(westNodes, j ,0) ) ;
        SV* weight = FETCH_ATTR( FETCH_ATTR_HV_REF( FETCH_ATTR_HV_REF(node , "connectedNodesWest") , "weights" ) , FETCH_ATTR_PV(connectedNode , "nodeid") );

        double val = FETCH_ATTR_NV(self_hv , "learning_rate") * FETCH_ATTR_NV(node , "error") * FETCH_ATTR_NV(connectedNode , "activation") ;
        val = SvNV(weight) - val ;

        if      ( val > 5 ) { val = 5 ;}
        else if ( val < -5 ) { val = -5 ;}
        
        sv_setnv(weight , val) ;
      }
      
    }
}

void hiddenOrInputToHidden_c( SV* self ) {
    STRLEN len;
    int i , j , k ;
    double nodeError , nodeActivation ;
    char* nodeid ;
    AV* layers ;
    HV* self_hv = OBJ_HV( self );
    double learningRate = FETCH_ATTR_NV(self_hv , "learning_rate") ;
    
    layers = FETCH_ATTR_AV_REF(self_hv , "layers") ;
    for (i = (av_len(layers)-1) ; i >= 0 ; --i) {
      SV* layer = *av_fetch(layers, i ,0) ;
  
      AV* nodes = FETCH_ATTR_AV_REF(OBJ_HV(layer) , "nodes") ;
      for (j = 0 ; j <= av_len(nodes) ; ++j) {
        HV* node = OBJ_HV( *av_fetch(nodes, j ,0) ) ;
        AV* eastNodes ;
        AV* westNodes ;
        
        if (!SvTRUE( FETCH_ATTR(node , "connectedNodesWest") ) ) break ;
        
        nodeid = FETCH_ATTR_PV(node , "nodeid") ;
        
        nodeError = 0 ;
        
        eastNodes = FETCH_ATTR_AV_REF( FETCH_ATTR_HV_REF(node , "connectedNodesEast") , "nodes") ;
        for (k = 0 ; k <= av_len(eastNodes) ; ++k) {
          HV* connectedNode = OBJ_HV( *av_fetch(eastNodes, k ,0) ) ;
          nodeError += FETCH_ATTR_NV(connectedNode , "error") * FETCH_ATTR_NV( FETCH_ATTR_HV_REF( FETCH_ATTR_HV_REF(connectedNode , "connectedNodesWest") , "weights") , nodeid) ;
        }
        
        hv_store(node , "error" , 5 , newSVnv(nodeError) , 0) ;
        
        nodeActivation = FETCH_ATTR_NV(node , "activation") ;
        
        westNodes = FETCH_ATTR_AV_REF( FETCH_ATTR_HV_REF(node , "connectedNodesWest") , "nodes") ;
        for (k = 0 ; k <= av_len(westNodes) ; ++k) {
          HV* connectedNode = OBJ_HV( *av_fetch(westNodes, k ,0) ) ;
          char* connectedNode_id = FETCH_ATTR_PV(connectedNode , "nodeid") ;
  
          HV* hv = FETCH_ATTR_HV_REF( FETCH_ATTR_HV_REF(node , "connectedNodesWest") , "weights") ;
          SV* weight_prev = FETCH_ATTR(hv , connectedNode_id) ;
  
          double weight = SvNV(weight_prev) - ( (1 - (nodeActivation*nodeActivation)) * nodeError * learningRate * FETCH_ATTR_NV(connectedNode , "activation") ) ;
  
          sv_setnv(weight_prev , weight) ;
        }
      }
    }
}

double RMSErr_c( SV* self , SV* outputPatternRef ) {
    STRLEN len;
    int i ;
    HV* self_hv = OBJ_HV( self );
    
    AV* outputLayer = FETCH_ATTR_AV_REF( FETCH_ELEM_HV_REF( FETCH_ATTR_AV_REF(self_hv , "layers") , -1) , "nodes") ;
    int outputLayer_len = av_len(outputLayer) ;
    
    AV* outputPattern = OBJ_AV(outputPatternRef) ;
        
    double sqrErr = 0 ;
    double error = 0 ;
    
    for (i = 0 ; i <= av_len(outputLayer) ; ++i) {
      HV* node = OBJ_HV( *av_fetch(outputLayer, i ,0) ) ;
      double val ;

      val = i <= outputLayer_len ? SvNV(*av_fetch(outputPattern, i ,0)) : 0 ;
      val = FETCH_ATTR_NV(node , "activation") - val ;

      sqrErr = val * val ;
    }    
    
    error = Perl_sqrt(sqrErr) ;

    return error ;
}

__INLINE_C_SRC__


}


1;