SignalStateCnv Class Reference

#include <JetSignalStateCnv.h>

Collaboration diagram for SignalStateCnv:

Public Types
enum	CompressionLevel { HIGH, MEDIUM, LOW, NO_COMPRESSION }

Public Member Functions
	SignalStateCnv ()
char	round (double d) const
char	char_from_ratio (double r) const
double	ratio_from_char (char c) const
JetConverterTypes::signalState_pers_t	compress (const JetConverterTypes::momentum &momCal, const JetConverterTypes::momentum &momRaw, CompressionLevel level, MsgStream &msg) const
JetConverterTypes::momentum	decompress (const JetConverterTypes::signalState_pers_t &ps, JetConverterTypes::momentum momCal, MsgStream &msg) const

Public Attributes
double	m_delta_p
double	m_step_p
double	m_delta_m
double	m_step_m
double	m_center

Detailed Description

---

to convert a double into a char

New implementation: Sept. 12th 2008 Rolf Seuster

Still keep the old implementation around - we need this to read old jets. Now, we store the differences as Delta_0 = M_cal / M_raw - 1 Delta_1 = phi_cal - phi_raw Delta_2 = eta_cal - eta_raw Delta_3 = Pt_cal / Pt_raw - 1

These differences will in general be small, so storing them as a semi-float will help. The new functions return a vector<unsigned short> where all deltas are compressed together, a bit simular to EventCommonTPCnv/Compressor. An additional parameter determines the compression, store everything in 2, 3, 4, 6 or 8 short. 2 short == 4 char = 8 bit / delta : 3 exponent, 1 sign, 4 mantissa 3 short == 48 bit = 12 bit / delta : 4 exponent, 1 sign, 7 mantissa 4 short == 64 bit = 16 bit / delta : 5 exponent, 1 sign, 10 mantissa 8 short == 128 bit == 4 floats We can also take into account that: Delta_0/3 are always positive Delta_1 is in [-pi;pi] to improve the precision.

Convert ratio of calibrated and uncalibrated jet quantities into a char. It is assumed that the ratio is in a given range so that he precision loss due to converting a float in a double is small (~0.5 %)

first implementation (before finding better/cleaner way?)

Author

P.A. Delsart

Definition at line 50 of file JetSignalStateCnv.h.

Member Enumeration Documentation

CompressionLevel

enum SignalStateCnv::CompressionLevel

Enumerator
HIGH
MEDIUM
LOW
NO_COMPRESSION

Definition at line 96 of file JetSignalStateCnv.h.

{ HIGH, MEDIUM, LOW, NO_COMPRESSION };

Constructor & Destructor Documentation

SignalStateCnv()

SignalStateCnv::SignalStateCnv ( )

inline

Definition at line 53 of file JetSignalStateCnv.h.

                  {
    m_delta_p =1.0;
    m_step_p  = 1.0 / 127;
    m_delta_m = 0.4;
    m_step_m  = 0.4 / 127;
    m_center  = 0.8;
  }

Member Function Documentation

char_from_ratio()

char SignalStateCnv::char_from_ratio ( double  r ) const

inline

Definition at line 73 of file JetSignalStateCnv.h.

                                       {
    double d= r -m_center ;
    if( d>0){
      if(d>m_delta_p) d = m_delta_p;
      return round(d/m_step_p);    
    }else{
      if(d<-m_delta_m) d = m_delta_m;
      return (round(fabs(d)/m_step_m) | 128);    
    }
 
  }

compress()

JetConverterTypes::signalState_pers_t SignalStateCnv::compress ( const JetConverterTypes::momentum &  momCal, const JetConverterTypes::momentum &  momRaw, CompressionLevel  level, MsgStream &  msg  ) const

inline

Definition at line 100 of file JetSignalStateCnv.h.

    {
      int exponent[4];
      double mantissa[4] = {0};
      JetConverterTypes::signalState_pers_t ps;
      
      double delta0(0);
      double delta1(0);
      double delta2(0);
      double delta3(0);
      int factor;
      
      msg << MSG::VERBOSE << "called JetSignalStateCnv::compress() for :" << endmsg;
      msg << MSG::VERBOSE << " raw momentum ( px | py | pz | m ) : ( "
      << momRaw.m_px << " | " 
      << momRaw.m_py << " | " 
      << momRaw.m_pz << " | " 
      << momRaw.m_m << " )" << endmsg;
      msg << MSG::VERBOSE << " cal momentum ( px | py | pz | m ) : ( "
      << momCal.m_px << " | " 
      << momCal.m_py << " | " 
      << momCal.m_pz << " | " 
      << momCal.m_m << " )" << endmsg;
 
      bool forceNoCompression=false;
      
      // switch off compression, if M or pT of raw or calibrated jet are zero...
      if ( momRaw.m_m == 0 || momCal.m_m == 0 )
    forceNoCompression=true;
      if ( momRaw.m_px == 0 && momRaw.m_py == 0 )
    forceNoCompression=true;
      if ( momCal.m_px == 0 && momCal.m_py == 0 )
    forceNoCompression=true;
      
      if ( forceNoCompression )
    {
      msg << MSG::DEBUG << "M or PT of calibrated or raw signal state of jet zero !"
          << " Switching off compression for this jet !!!" << endmsg;
      level = NO_COMPRESSION;
    }
      
      // prepare for compression the ratios
      if ( level != NO_COMPRESSION )
    {
      double angleC = atan2( momCal.m_py, momCal.m_px );
      double angleR = atan2( momRaw.m_py, momRaw.m_px );
      double p_traC = sqrt( momCal.m_px * momCal.m_px + momCal.m_py * momCal.m_py );
      double p_traR = sqrt( momRaw.m_px * momRaw.m_px + momRaw.m_py * momRaw.m_py );
      mantissa[0] = frexp( momCal.m_m / momRaw.m_m - 1, &exponent[0] );
      mantissa[1] = frexp( angleC - angleR,             &exponent[1] );
      mantissa[2] = frexp( momCal.eta() - momRaw.eta(), &exponent[2] );
      mantissa[3] = frexp( p_traC / p_traR - 1,         &exponent[3] );
      
      delta0 = momCal.m_m / momRaw.m_m - 1;
      delta1 = angleC - angleR;
      delta2 = momCal.eta() - momRaw.eta();
      delta3 = p_traC / p_traR - 1;
    }
      
      unsigned long tmp0(0);
      unsigned long tmp1(0);
      unsigned long tmp2(0);
      unsigned long tmp3(0);
      
      // here, we'll store the 
      unsigned short vec0(0);
      unsigned short vec1(0);
      unsigned short vec2(0);
      
      switch(level)
    {
    case HIGH:               // HIGH compression means, store differnces in 2 shorts
      factor = 0;            // compress the mass ratio
      exponent[0] += 2;
      if ( exponent[0] > 0x7 ) exponent[0] = 0x7;
      if ( exponent[0] < 0x0 )
        {
          factor = -exponent[0];
          exponent[0] = 0x0;
        }
      tmp0 = int( fabs(mantissa[0]) * 0x10 ) >> factor;
      tmp0 |= ( exponent[0] & 0x7 ) << 5;
      if ( mantissa[0] < 0 ) tmp0 |= 0x10;
      
      factor = 0;            // compress delta phi
      exponent[1] += 5;
      if ( exponent[1] > 0x7 ) exponent[1] = 0x7;
      if ( exponent[1] < 0x0 )
        {
          factor = -exponent[1];
          exponent[1] = 0x0;
        }
      tmp1 = int( fabs(mantissa[1]) * 0x10 ) >> factor;
      tmp1 |= ( exponent[1] & 0x7 ) << 5;
      if ( mantissa[1] < 0 ) tmp1 |= 0x10;
      
      factor = 0;            // compresss delta eta
      exponent[2] += 5;
      if ( exponent[2] > 0x7 ) exponent[2] = 0x7;
      if ( exponent[2] < 0x0 )
        {
          factor = -exponent[2];
          exponent[2] = 0x0;
        }
      tmp2 = int( fabs(mantissa[2]) * 0x10 ) >> factor;
      tmp2 |= ( exponent[2] & 0x7 ) << 5;
      if ( mantissa[2] < 0 ) tmp2 |= 0x10;
      
      factor = 0;            // compresss the pT ratio
      exponent[3] += 5;
      if ( exponent[3] > 0x7 ) exponent[3] = 0x7;
      if ( exponent[3] < 0x0 )
        {
          factor = -exponent[3];
          exponent[3] = 0x0;
        }
      tmp3 = int( fabs(mantissa[3]) * 0x10 ) >> factor;
      tmp3 |= ( exponent[3] & 0x7 ) << 5;
      if ( mantissa[3] < 0 ) tmp3 |= 0x10;
      
      vec0  = tmp0;
      vec0 += tmp1 << 8;
      vec1  = tmp2;
      vec1 += tmp3 << 8;
      ps.push_back(vec0);
      ps.push_back(vec1);
      break;
      
    case MEDIUM:             // MEDIUM compression means, store differences in 3 shorts
      factor = 0;            // compress the mass ratio
      exponent[0] += 3;
      if ( exponent[0] > 0xF ) exponent[0] = 0xF;
      if ( exponent[0] < 0x0 )
        {
          factor = -exponent[0];
          exponent[0] = 0;
        }
      tmp0 = int( fabs(mantissa[0]) * 0x80 ) >> factor;
      if ( mantissa[0] < 0 ) tmp0 |= 0x80;
      
      factor = 0;            // compress delta phi
      exponent[1] += 6;
      if ( exponent[1] > 0xF ) exponent[1] = 0xF;
      if ( exponent[1] < 0x0 )
        {
          factor = -exponent[1];
          exponent[1] = 0;
        }
      tmp1 = int( fabs(mantissa[1]) * 0x80 ) >> factor;
      if ( mantissa[1] < 0 ) tmp1 |= 0x80;
      
      factor = 0;            // compresss delta eta
      exponent[2] += 6;
      if ( exponent[2] > 0xF ) exponent[2] = 0xF;
      if ( exponent[2] < 0x0 )
        {
          factor = -exponent[2];
          exponent[2] = 0;
        }
      tmp2 = int( fabs(mantissa[2]) * 0x80 ) >> factor;
      if ( mantissa[2] < 0 ) tmp2 |= 0x80;
      
      factor = 0;            // compresss the pT ratio
      exponent[3] += 6;
      if ( exponent[3] > 0xF ) exponent[3] = 0xF;
      if ( exponent[3] < 0x0 )
        {
          factor = -exponent[3];
          exponent[3] = 0;
        }
      tmp3 = int( fabs(mantissa[3]) * 0x80 ) >> factor;
      if ( mantissa[3] < 0 ) tmp3 |= 0x80;
      
      vec0  =   ( tmp0 & 0xFF );
      vec0 +=   ( tmp1 & 0xFF ) << 8;
      vec1  =   ( tmp2 & 0xFF );
      vec1 +=   ( tmp3 & 0xFF ) << 8;
      vec2  =     exponent[0];
      vec2 |=     exponent[1] <<  4;
      vec2 |=     exponent[2] <<  8;
      vec2 |=     exponent[3] << 12;
      ps.push_back(vec0);
      ps.push_back(vec1);
      ps.push_back(vec2);
      break;
      
    case LOW:                // LOW compression means, store differences in 4 shorts
      factor = 0;            // compress the mass ratio
      exponent[0] += 5;
      if ( exponent[0] > 31 ) exponent[0] = 31;
      if ( exponent[0] <  0 )
        {
          factor = -exponent[0];
          exponent[0] = 0;
        }
      tmp0 = int( fabs(mantissa[0]) * 0x400 ) >> factor;
      tmp0 |= exponent[0] << 11;
      if ( mantissa[0] < 0 ) tmp0 |= 0x400;
      
      factor = 0;            // compress delta phi
      exponent[1] += 7;
      if ( exponent[1] > 31 ) exponent[1] = 31;
      if ( exponent[1] <  0 )
        {
          factor = -exponent[1];
          exponent[1] = 0;
        }
      tmp1 = int( fabs(mantissa[1]) * 0x400 ) >> factor;
      tmp1 |= exponent[1] << 11;
      if ( mantissa[1] < 0 ) tmp1 |= 0x400;
      
      factor = 0;            // compresss delta eta
      exponent[2] += 7;
      if ( exponent[2] > 31 ) exponent[2] = 31;
      if ( exponent[2] <  0 )
        {
          factor = -exponent[2];
          exponent[2] = 0;
        }
      tmp2 = int( fabs(mantissa[2]) * 0x400 ) >> factor;
      tmp2 |= exponent[2] << 11;
      if ( mantissa[2] < 0 ) tmp2 |= 0x400;
      
      factor = 0;            // compresss the pT ratio
      exponent[3] += 7;
      if ( exponent[3] > 31 ) exponent[3] = 31;
      if ( exponent[3] <  0 )
        {
          factor = -exponent[3];
          exponent[3] = 0;
        }
      tmp3 = int( fabs(mantissa[3]) * 0x400 ) >> factor;
      tmp3 |= exponent[3] << 11;
      if ( mantissa[3] < 0 ) tmp3 |= 0x400;
      
      ps.push_back(tmp0);
      ps.push_back(tmp1);
      ps.push_back(tmp2);
      ps.push_back(tmp3);
      break;
    case NO_COMPRESSION:
    default:
      union {
        unsigned short s[2];
        float f;
      } m;
      
      m.f = momRaw.m_px;  ps.push_back(m.s[0]);  ps.push_back(m.s[1]);
      m.f = momRaw.m_py;  ps.push_back(m.s[0]);  ps.push_back(m.s[1]);
      m.f = momRaw.m_pz;  ps.push_back(m.s[0]);  ps.push_back(m.s[1]);
      m.f = momRaw.m_m;   ps.push_back(m.s[0]);  ps.push_back(m.s[1]);
      msg << MSG::VERBOSE << " compress x : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " compress y : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " compress z : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " compress m : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      break;
    }
      if ( msg.level() <= MSG::VERBOSE )
    {
      msg << MSG::VERBOSE << " compress # ps : " << ps.size() << " : ";
      for ( JetConverterTypes::signalState_pers_t::const_iterator it=ps.begin(); it != ps.end(); ++it )
        msg << std::hex << *it << " ";
      msg << std::dec << endmsg;
      msg << MSG::VERBOSE << " compress x : " << momRaw.m_px << endmsg;
      msg << MSG::VERBOSE << " compress y : " << momRaw.m_py << endmsg;
      msg << MSG::VERBOSE << " compress z : " << momRaw.m_pz << endmsg;
      msg << MSG::VERBOSE << " compress m : " << momRaw.m_m  << endmsg;
      
      int d0(0);
      int d1(0);
      
      switch(level)
        {
        case HIGH:    d0=2; d1=5; break;
        case MEDIUM:  d0=3; d1=6; break;
        case LOW:     d0=5; d1=7; break;
        case NO_COMPRESSION:
        default:                  break;
        };
      
      msg << MSG::DEBUG << " compress M   : " << delta0 << " = "
          << mantissa[0] << " *2^ " << exponent[0]-d0 << endmsg;
      msg << MSG::DEBUG << " compress phi : " << delta1 << " = "
          << mantissa[1] << " *2^ " << exponent[1]-d1 << endmsg;
      msg << MSG::DEBUG << " compress eta : " << delta2 << " = "
          << mantissa[2] << " *2^ " << exponent[2]-d1 << endmsg;
      msg << MSG::DEBUG << " compress pT  : " << delta3 << " = "
          << mantissa[3] << " *2^ " << exponent[3]-d1 << endmsg;
    }
      return ps;
    };

decompress()

JetConverterTypes::momentum SignalStateCnv::decompress ( const JetConverterTypes::signalState_pers_t &  ps, JetConverterTypes::momentum  momCal, MsgStream &  msg  ) const

inline

Definition at line 394 of file JetSignalStateCnv.h.

    {
      JetConverterTypes::momentum momRaw;
      int exponent[4] = {0};
      double mantissa[4] = {0};
      //std::cout<< "   decompressing momCal px="<< momCal.m_px << "  "<< momCal.m_py << "  "<< momCal.m_pz << "  "<< momCal.m_m << std::endl;
      
      switch( ps.size() )
    {
    case 2:
      exponent[0] = ( ( ps[0] >>  5 ) & 0x7 ) - 2;
      exponent[1] = ( ( ps[0] >> 13 ) & 0x7 ) - 5;
      exponent[2] = ( ( ps[1] >>  5 ) & 0x7 ) - 5;
      exponent[3] = ( ( ps[1] >> 13 ) & 0x7 ) - 5;
      
      mantissa[0] = double(   ps[0]        & 0x1F ) / 0x10;
      mantissa[1] = double( ( ps[0] >> 8 ) & 0x1F ) / 0x10;
      mantissa[2] = double(   ps[1]        & 0x1F ) / 0x10;
      mantissa[3] = double( ( ps[1] >> 8 ) & 0x1F ) / 0x10;
      if ( ps[0] & 0x10   ) mantissa[0] = -mantissa[0];
      if ( ps[0] & 0x1000 ) mantissa[1] = -mantissa[1];
      if ( ps[1] & 0x10   ) mantissa[2] = -mantissa[2];
      if ( ps[1] & 0x1000 ) mantissa[3] = -mantissa[3];
      break;
      
    case 3:
      exponent[0] = (   ps[2]         & 0xF ) - 3;
      exponent[1] = ( ( ps[2] >>  4 ) & 0xF ) - 6;
      exponent[2] = ( ( ps[2] >>  8 ) & 0xF ) - 6;
      exponent[3] = ( ( ps[2] >> 12 ) & 0xF ) - 6;
      
      mantissa[0] = double(   ps[0]        & 0x7F ) / 0x80;
      mantissa[1] = double( ( ps[0] >> 8 ) & 0x7F ) / 0x80;
      mantissa[2] = double(   ps[1]        & 0x7F ) / 0x80;
      mantissa[3] = double( ( ps[1] >> 8 ) & 0x7F ) / 0x80;
      if ( ps[0] & 0x80   ) mantissa[0] = -mantissa[0];
      if ( ps[0] & 0x8000 ) mantissa[1] = -mantissa[1];
      if ( ps[1] & 0x80   ) mantissa[2] = -mantissa[2];
      if ( ps[1] & 0x8000 ) mantissa[3] = -mantissa[3];
      break;
      
    case 4:
      exponent[0] = ( ( ps[0] >> 11 ) & 0x1F ) - 5;
      exponent[1] = ( ( ps[1] >> 11 ) & 0x1F ) - 7;
      exponent[2] = ( ( ps[2] >> 11 ) & 0x1F ) - 7;
      exponent[3] = ( ( ps[3] >> 11 ) & 0x1F ) - 7;
      
      mantissa[0] = double( ps[0] & 0x3FF ) / 0x400;
      mantissa[1] = double( ps[1] & 0x3FF ) / 0x400;
      mantissa[2] = double( ps[2] & 0x3FF ) / 0x400;
      mantissa[3] = double( ps[3] & 0x3FF ) / 0x400;
      if ( ps[0] & 0x400 ) mantissa[0] = -mantissa[0];
      if ( ps[1] & 0x400 ) mantissa[1] = -mantissa[1];
      if ( ps[2] & 0x400 ) mantissa[2] = -mantissa[2];
      if ( ps[3] & 0x400 ) mantissa[3] = -mantissa[3];
      break;
      
    case 8:
    default:
      union {
        unsigned short s[2];
        float f;
      } m;
      
      m.s[0] = ps[0]; m.s[1] = ps[1]; momRaw.m_px = m.f;
      m.s[0] = ps[2]; m.s[1] = ps[3]; momRaw.m_py = m.f;
      m.s[0] = ps[4]; m.s[1] = ps[5]; momRaw.m_pz = m.f;
      m.s[0] = ps[6]; m.s[1] = ps[7]; momRaw.m_m = m.f;
      msg << MSG::VERBOSE << " RS x : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " RS y : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " RS z : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      msg << MSG::VERBOSE << " RS m : " << m.f << " = " << m.s[0] << " = " << m.s[1] << endmsg;
      break;
    };
      
      if ( ps.size() < 8 )
    {
      double delta0 = ldexp( mantissa[0], exponent[0] );
      double delta1 = ldexp( mantissa[1], exponent[1] );
      double delta2 = ldexp( mantissa[2], exponent[2] );
      double delta3 = ldexp( mantissa[3], exponent[3] );
 
      //std::cout<< " decompressing "<< delta0 <<"  "<< delta1 << "  "<< delta2 <<"  "<< delta3 << "  "<< std::endl;
 
      if( ( delta0==-1) || (delta3==-1)){
        msg << MSG::WARNING << "A jet was badly decompressed. Returning null to avoid fpe in SignalStateCnv::decompress "<<endmsg;
        return momRaw;
      }
      
      msg << MSG::VERBOSE << " RS 0 : " << delta0 << " = " << mantissa[0] << " = " << exponent[0] << endmsg;
      msg << MSG::VERBOSE << " RS 1 : " << delta1 << " = " << mantissa[1] << " = " << exponent[1] << endmsg;
      msg << MSG::VERBOSE << " RS 2 : " << delta2 << " = " << mantissa[2] << " = " << exponent[2] << endmsg;
      msg << MSG::VERBOSE << " RS 3 : " << delta3 << " = " << mantissa[3] << " = " << exponent[3] << endmsg;
      
      double angleC = atan2( momCal.m_py, momCal.m_px );
      double p_traC = sqrt( momCal.m_px * momCal.m_px + momCal.m_py * momCal.m_py );
      
      double angleR = angleC - delta1;
      double eta_R  = momCal.eta() - delta2;
      double p_traR = p_traC / ( delta3 + 1 );
      momRaw.m_m  = momCal.m_m / ( delta0 + 1 );
      momRaw.m_px = p_traR * cos(angleR);
      momRaw.m_py = p_traR * sin(angleR);
      momRaw.m_pz = p_traR * sinh(eta_R);
    }
      msg << MSG::VERBOSE << " RS # ps : " << ps.size() << " : ";
      for ( JetConverterTypes::signalState_pers_t::const_iterator it=ps.begin(); it != ps.end(); ++it )
    msg << std::hex << *it << " ";
      msg << std::dec << endmsg;
      msg << MSG::VERBOSE << " RS x : " << momRaw.m_px << endmsg;
      msg << MSG::VERBOSE << " RS y : " << momRaw.m_py << endmsg;
      msg << MSG::VERBOSE << " RS z : " << momRaw.m_pz << endmsg;
      msg << MSG::VERBOSE << " RS m : " << momRaw.m_m  << endmsg;
      
      return momRaw;
    };

ratio_from_char()

double SignalStateCnv::ratio_from_char ( char  c ) const

inline

Definition at line 85 of file JetSignalStateCnv.h.

                                       {
    bool isneg = c & 128; // are storing a negativ diff ?
    int val   = c & 127;  // the actual diff value
    if(isneg){
      return  (m_center - val*m_step_m);
    }else{
      return  (m_center + val*m_step_p);
    }
 
  }

round()

char SignalStateCnv::round ( double  d ) const

inline

Definition at line 71 of file JetSignalStateCnv.h.

{return (char)floor(d+0.5);}

Member Data Documentation

m_center

double SignalStateCnv::m_center

Definition at line 67 of file JetSignalStateCnv.h.

m_delta_m

double SignalStateCnv::m_delta_m

Definition at line 65 of file JetSignalStateCnv.h.

m_delta_p

double SignalStateCnv::m_delta_p

Definition at line 63 of file JetSignalStateCnv.h.

m_step_m

double SignalStateCnv::m_step_m

Definition at line 66 of file JetSignalStateCnv.h.

m_step_p

double SignalStateCnv::m_step_p

Definition at line 64 of file JetSignalStateCnv.h.

---

The documentation for this class was generated from the following file:

• JetSignalStateCnv.h