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C++ TheMatrix::Minus方法代码示例

本文整理汇总了C++中TheMatrix::Minus方法的典型用法代码示例。如果您正苦于以下问题:C++ TheMatrix::Minus方法的具体用法?C++ TheMatrix::Minus怎么用?C++ TheMatrix::Minus使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在TheMatrix的用法示例。


在下文中一共展示了TheMatrix::Minus方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: ComputeLossAndGradient


//.........这里部分代码省略.........
         find_best_label_grammer(Y[i].pos,Y[i].type, X[i], w, ybar, ybarlabel, marginloss, labelloss, 0, _data->getNumOfClass());
      else
         find_best_label(Y[i].pos,Y[i].type, X[i], w, ybar, ybarlabel, marginloss, labelloss, 0, _data->getNumOfClass());
      
      double labelloss_y = 0;
      double marginloss_y = 0;
      double labelloss_ybar = 0;
      double marginloss_ybar = 0;
      
      
      ComputeLoss(Y[i].pos,Y[i].type,ybar,ybarlabel,X[i],w,marginloss_ybar,labelloss_ybar,1);
      if(lossw[0]!=0)
         labelloss+=lossw[0];
      
      if(lastDuration>0)
      {
         marginloss = marginloss_ybar;
         labelloss = labelloss_ybar;
      }
      if(verbosity>=3)
      {					
         ComputeLoss(Y[i].pos,Y[i].type,Y[i].pos,Y[i].type,X[i],w,marginloss_y,labelloss_y,1);
         printf("dp------marginloss:%2.4f---labelloss:%2.4f------\n",marginloss,labelloss);	
         printf("ybar----marginloss:%2.4f---labelloss:%2.4f------\n",marginloss_ybar,labelloss_ybar);
         printf("y-------marginloss:%2.4f---labelloss:%2.4f------\n",marginloss_y,labelloss_y);			
         if(abs(labelloss_ybar-labelloss)>1e-5)
         {
            printf("labelloss doesn't match!\n");
            //exit(0);
         }
         if(abs(marginloss_ybar-marginloss)>1e-5)
         {
            printf("marginloss_ybar_dp:%2.4f != marginloss_ybar_computeLoss:%2.4f\n",marginloss,marginloss_ybar);
            printf("marginloss doesn't match!\n");
         }
      }
      
      // construct the gradient vector for the part of true y
      const vector<unsigned int> &y = Y[i].pos;
      const vector<unsigned int> &ylabel = Y[i].type;
      g.Zero();
      
      for(unsigned int j=0; j < y.size(); j++)
      {
         //g.Add(*(X[i].phi_1[y[j]]));
         //g.Add(*(X[i].phi_2[y[j-1]][y[j]-y[j-1]-1]));
         _data->TensorPhi1(X[i].phi_1[y[j]],ylabel[j],0,tphi_1);
         g.Add(*tphi_1);
         if(j > 0)
         {
            _data->TensorPhi2(X[i].phi_2[y[j-1]][y[j]-y[j-1]-1], ylabel[j-1], ylabel[j], 0,0,tphi_2);
            g.Add(*tphi_2);			
         }
      }
      if(y.size() > 0)
      {
         //g.Add(*(X[i].phi_2[y[y.size()-1]][X[i].len-1 - y[y.size()-1]-1]));////
         _data->TensorPhi2(X[i].phi_2[y[y.size()-1]][X[i].len - y[y.size()-1]-1 ], ylabel[y.size()-1], 0,0,0,tphi_2);
         g.Add(*tphi_2);
      }
      
      // for predicted y'
      for(unsigned int j=0; j < ybar.size(); j++)
      {  
         //grad.Add(*(X[i].phi_1[ybar[j]]));                         
         //grad.Add(*(X[i].phi_2[ybar[j-1]][ybar[j]-ybar[j-1]-1]));
         _data->TensorPhi1(X[i].phi_1[ybar[j]],ybarlabel[j],0,tphi_1);
         grad.Add(*tphi_1);
         if(j>0)			
         {
            _data->TensorPhi2(X[i].phi_2[ybar[j-1]][ybar[j]-ybar[j-1]-1], ybarlabel[j-1], ybarlabel[j], 0,0,tphi_2);
            grad.Add(*tphi_2); ////			
         }
      }
      if(ybar.size() > 0)
      {
         //grad.Add(*(X[i].phi_2[ybar[ybar.size()-1]][X[i].len-1 - ybar[ybar.size()-1]-1]));
         _data->TensorPhi2(X[i].phi_2[ybar[ybar.size()-1]][X[i].len - ybar[ybar.size()-1]-1 ], ybarlabel[ybar.size()-1], 0, 0,0,tphi_2);
         grad.Add(*tphi_2);
      }
      grad.Minus(g);
      
      
      // accumulate the loss
      w.Dot(g, w_dot_g);	
      loss = loss - w_dot_g + marginloss + labelloss;    
      
   }
   scalingFactor = 1.0/trainExNum;
   grad.Scale(scalingFactor);	
   loss *= scalingFactor;        
   
   if(verbosity)
   {
      double gnorm = 0.0;
      grad.Norm2(gnorm);
      cout << "gradient norm=" << gnorm << endl;
   }
   //Evaluate(_model);
}
开发者ID:funkey,项目名称:bmrm,代码行数:101,代码来源:smmmulticlassloss.cpp


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