C++ Eval_Point::set_direction方法代码示例

//.........这里部分代码省略.........
      const NOMAD::Direction * dir = x[i]->get_direction();
      if ( dir && ( dir->is_mads() || dir->get_type()==NOMAD::MODEL_SEARCH_DIR ) ) {

	// get the x_k's signature:
	signature = x[i]->get_signature();
	if ( !signature )
	  throw NOMAD::Exception ( "Speculative_Search.cpp" , __LINE__ ,
	  "Speculative_Search::search(): could not get the signature" );
      
	xkm1 = *x[i] - *dir;
      
	lk = lkm1 = *x[i]->get_mesh_index();
	NOMAD::Mesh::update ( NOMAD::FULL_SUCCESS , lk );
      
	n           = signature->get_n();
	delta_m_k   = NOMAD::Point ( n );
	delta_m_km1 = NOMAD::Point ( n );
	factor      = NOMAD::Point ( n );

	signature->get_mesh().get_delta_m ( delta_m_k   , lk   );
	signature->get_mesh().get_delta_m ( delta_m_km1 , lkm1 );
      
	// multiplicative factor: takes into account the fact that
	// the direction contains \Delta^m_k:
	try {

	  // factor = delta_m_k / delta_m_km1 :
	  for ( int k = 0 ; k < n ; ++k ) {
	    if ( delta_m_k[k].is_defined()   && delta_m_km1[k].is_defined() &&
		 delta_m_k[k].value() != 0.0 && delta_m_km1[k].value() != 0.0 )
	      factor[k] = delta_m_k[k] / delta_m_km1[k];
	    else
	      factor[k] = 0.0;
	  }
	}
	catch ( NOMAD::Double::Invalid_Value & ) {
	  if ( display_degree == NOMAD::FULL_DISPLAY )
	    out << "could not compute " << _type << " point: stop" << std::endl
		<< NOMAD::close_block ( "end of speculative search" );
	  stop        = true;
	  stop_reason = NOMAD::MESH_PREC_REACHED;
	  return;
	}
      
	if ( lkm1 <= 0 )
	  factor *= NOMAD::Mesh::get_mesh_update_basis();
      
	// speculative search point:
	NOMAD::Direction new_dir ( n , 0.0 , dir->get_type() );
	new_dir.Point::operator = ( factor * *dir );
      
	sk = new NOMAD::Eval_Point;
	sk->set ( n , _p.get_bb_nb_outputs() );
	sk->set_signature  ( signature );
	sk->set_direction  ( &new_dir );
	sk->set_mesh_index ( &lk );
      
	sk->Point::operator = ( xkm1 + new_dir );

	if ( display_degree == NOMAD::FULL_DISPLAY ) {
	  out << "trial point #" << sk->get_tag()
	      << ": ( ";
	  sk->Point::display ( out ," " , 2 , NOMAD::Point::get_display_limit() );
	  out << " )" << std::endl;
	}
      
	// add the new point to the list of search trial points:
	ev_control.add_eval_point ( sk                      ,
				    display_degree          ,
				    _p.get_snap_to_bounds() ,
				    NOMAD::Double()         ,
				    NOMAD::Double()         ,
				    NOMAD::Double()         ,
				    NOMAD::Double()           );
      }
    }
  }
  
  nb_search_pts = ev_control.get_nb_eval_points();
  
  // eval_list_of_points:
  // --------------------
  new_feas_inc = new_infeas_inc = NULL;

  ev_control.eval_list_of_points ( _type                   ,
				   mads.get_true_barrier() ,
				   mads.get_sgte_barrier() ,
				   mads.get_pareto_front() ,
				   stop                    ,
				   stop_reason             ,
				   new_feas_inc            ,
				   new_infeas_inc          ,
				   success                   );

  if ( display_degree == NOMAD::FULL_DISPLAY ) {
    std::ostringstream oss;
    oss << "end of speculative search (" << success << ")";
    out << NOMAD::close_block ( oss.str() ) << std::endl;
  }
}

/*-----------------------------------------------------------------*/
void NOMAD::Cache::update ( NOMAD::Eval_Point       & cache_x ,
                           const NOMAD::Eval_Point & x         ) const
{
    const NOMAD::Point & bbo_x = x.get_bb_outputs();
    
    if ( &cache_x == &x         ||
        !x.is_eval_ok()        ||
        !cache_x.is_in_cache() ||
        bbo_x.empty()          ||
        cache_x != x              )
        return;
    
    // check the eval types:
    if ( x.get_eval_type      () != _eval_type ||
        cache_x.get_eval_type() != _eval_type    )
        throw NOMAD::Cache::Cache_Error ( "Cache.cpp" , __LINE__ ,
                                         "NOMAD::Cache:update(): problem with the eval. types" );
    
    const NOMAD::Point & bbo_cache_x = cache_x.get_bb_outputs();
    int                  m           = bbo_cache_x.size();
    
    _sizeof -= cache_x.size_of();
    
    // if the current point could not evaluate and x did,
    // or if the number of bb outputs is different, we set cache_x = x:
    if ( !cache_x.is_eval_ok() || m != bbo_x.size() )
    {
        cache_x.set_eval_status ( NOMAD::EVAL_OK     );
        cache_x.set_bb_output   ( bbo_x              );
        cache_x.set_signature   ( x.get_signature () );
        cache_x.set_direction   ( x.get_direction () );
        
        _sizeof += cache_x.size_of();
        return;
    }
    
    // we complete _bb_outputs:
    int c1 = 0;
    int c2 = 0;
    
    for ( int i = 0 ; i < m ; ++i ) {
        
        if ( bbo_cache_x[i].is_defined() )
            ++c1;
        
        if ( bbo_x[i].is_defined() )
            ++c2;
        
        if ( !bbo_cache_x[i].is_defined() && bbo_x[i].is_defined() )
            cache_x.set_bb_output ( i , bbo_x[i] );
    }
    
    // the two points are 'eval_ok' and have comparable outputs:
    // we select the best as the one with the more defined bb_outputs:
    if ( c2 > c1 ) {
        cache_x.set_signature  ( x.get_signature () );
        cache_x.set_direction  ( x.get_direction () );
        
    }
    
    _sizeof += cache_x.size_of();
}