BestTrackSelection Class Reference

#include <BestTrackSelection.h>

Public Member Functions
void	cancel_multi_bx (const std::deque< EMTFTrackCollection > &extended_best_track_cands, EMTFTrackCollection &best_tracks) const
void	cancel_one_bx (const std::deque< EMTFTrackCollection > &extended_best_track_cands, EMTFTrackCollection &best_tracks) const
void	configure (int verbose, int endcap, int sector, int bx, int bxWindow, int maxRoadsPerZone, int maxTracks, bool useSecondEarliest, bool bugSameSectorPt0)
void	process (const std::deque< EMTFTrackCollection > &extended_best_track_cands, EMTFTrackCollection &best_tracks) const

Private Attributes
bool	bugSameSectorPt0_
int	bx_
int	bxWindow_
int	endcap_
int	maxRoadsPerZone_
int	maxTracks_
int	sector_
bool	useSecondEarliest_
int	verbose_

Detailed Description

Definition at line 6 of file BestTrackSelection.h.

Member Function Documentation

cancel_multi_bx()

void BestTrackSelection::cancel_multi_bx	(	const std::deque< EMTFTrackCollection > &	extended_best_track_cands,
		EMTFTrackCollection &	best_tracks
	)		const

Definition at line 248 of file BestTrackSelection.cc.

                                                                                 {
  const int max_h = bxWindow_;         // = 3 bx history
  const int max_z = emtf::NUM_ZONES;   // = 4 zones
  const int max_n = maxRoadsPerZone_;  // = 3 candidates per zone
  const int max_zn = max_z * max_n;    // = 12 total candidates
  const int max_hzn = max_h * max_zn;  // = 36 total candidates
  emtf_assert(maxTracks_ <= max_hzn);
 
  const int delayBX = bxWindow_ - 1;
  const int num_h = extended_best_track_cands.size() / max_z;  // num of bx history so far
 
  // Emulate the arrays used in firmware
  typedef std::array<int, 3> segment_ref_t;
  std::vector<std::vector<segment_ref_t> > segments(max_hzn,
                                                    std::vector<segment_ref_t>());  // 2D array [hzn][num segments]
 
  std::vector<std::vector<bool> > larger(max_hzn, std::vector<bool>(max_hzn, false));  // 2D array [hzn][hzn]
  std::vector<std::vector<bool> > winner(max_hzn, std::vector<bool>(max_hzn, false));
 
  std::vector<bool> exists(max_hzn, false);  // 1D array [hzn]
  std::vector<bool> killed(max_hzn, false);
  std::vector<int> rank(max_hzn, 0);
  std::vector<int> good_bx(max_hzn, 0);
 
  // Initialize arrays: rank, good_bx, segments
  for (int h = 0; h < num_h; ++h) {
    // extended_best_track_cands[0..3] has 4 zones for road/pattern BX-0 (i.e. current) with possible tracks from [BX-2, BX-1, BX-0]
    // extended_best_track_cands[4..7] has 4 zones for road/pattern BX-1 with possible tracks from [BX-3, BX-2, BX-1]
    // extended_best_track_cands[8..11] has 4 zones for road/pattern BX-2 with possible tracks from [BX-4, BX-3, BX-2]
 
    for (int z = 0; z < max_z; ++z) {
      const EMTFTrackCollection& tracks = extended_best_track_cands.at(h * max_z + z);
      const int ntracks = tracks.size();
      emtf_assert(ntracks <= max_n);
 
      for (int n = 0; n < ntracks; ++n) {
        const int hzn = (h * max_z * max_n) + (n * max_z) + z;  // for (i = 0; i < 12; i = i+1) rank[i%4][i/4]
        const EMTFTrack& track = tracks.at(n);
        int cand_bx = track.Second_BX();
        cand_bx -= (bx_ - delayBX);  // convert track.second_bx=[BX-2, BX-1, BX-0] --> cand_bx=[0,1,2]
 
        rank.at(hzn) = track.Rank();
        if (cand_bx == 0)
          good_bx.at(hzn) = 1;  // kill this rank if it's not the right BX
 
        for (const auto& conv_hit : track.Hits()) {
          emtf_assert(conv_hit.Valid());
 
          // Notes from Alex (2017-03-16):
          //
          //     What happens currently is that RPC hits are inserted instead of
          // CSC hits, if CSC hits are missing. So the track address will point
          // at a CSC chamber, but the actual hit may have come from
          // corresponding RPC located behind it. If the same substitution
          // happened in the neighboring sector, then the cancellation in uGMT
          // will work correctly. If the substitution happened in only one
          // sector, then RPC hit may "trump" a CSC hit, or vice versa.
 
          // A segment identifier (chamber, strip, bx)
          const segment_ref_t segment = {{conv_hit.PC_station() * 9 + conv_hit.PC_chamber(),
                                          (conv_hit.PC_segment() % 2),
                                          conv_hit.BX()}};  // FW doesn't check whether a segment is CSC or RPC
          //int chamber_index  = int(conv_hit.Subsystem() == TriggerPrimitive::kRPC)*9*5;
          //chamber_index     += conv_hit.PC_station()*9;
          //chamber_index     += conv_hit.PC_chamber();
          //const segment_ref_t segment = {{chamber_index, conv_hit.Strip(), conv_hit.BX()}};
          segments.at(hzn).push_back(segment);
        }
      }  // end loop over n
    }    // end loop over z
  }      // end loop over h
 
  // Simultaneously compare each rank with each other
  int i = 0, j = 0, ri = 0, rj = 0, sum = 0;
 
  for (i = 0; i < max_hzn; ++i) {
    //for (j = 0; j < max_hzn; ++j) {
    //  larger[i][j] = 0;
    //}
    larger[i][i] = true;  // result of comparison with itself
    //ri = rank[i%4][i/4]; // first index loops zone, second loops candidate. Zone loops faster, so we give equal priority to zones
    ri = rank[i];
 
    for (j = i + 1; j < max_hzn; ++j) {
      // i&j bits show which rank is larger
      //rj = rank[j%4][j/4];
      rj = rank[j];
      if (ri >= rj)
        larger[i][j] = true;
      else
        larger[j][i] = true;
    }
    // "larger" array shows the result of comparison for each rank
 
    // track exists if quality != 0
    exists[i] = (ri != 0);
  }
 
  // ghost cancellation, over 3 BXs
  for (i = 0; i < max_hzn - 1; ++i) {    // candidate loop
    for (j = i + 1; j < max_hzn; ++j) {  // comparison candidate loop
      int shared_segs = 0;
 
      // count shared segments
      for (const auto& isegment : segments.at(i)) {  // loop over all pairs of hits
        for (const auto& jsegment : segments.at(j)) {
          if (isegment == jsegment) {  // same chamber and same segment
            shared_segs += 1;
          }
        }
      }
 
      if (shared_segs > 0) {  // a single shared segment means it's ghost
        // kill candidate that has lower rank
        if (larger[i][j])
          killed[j] = true;
        else
          killed[i] = true;
      }
    }
  }
 
  // remove ghosts according to kill mask
  //exists = exists & (~kill1);
  for (i = 0; i < max_hzn; ++i) {
    exists[i] = exists[i] & (!killed[i]);
  }
 
  // remove tracks that are not at correct BX number
  //exists = exists & good_bx;
  for (i = 0; i < max_hzn; ++i) {
    exists[i] = exists[i] & good_bx[i];
  }
 
  bool anything_exists = (std::find(exists.begin(), exists.end(), 1) != exists.end());
  if (!anything_exists)
    return;
 
  // update "larger" array
  for (i = 0; i < max_hzn; ++i) {
    for (j = 0; j < max_hzn; ++j) {
      //if  (exists[i]) larger[i] = larger[i] | (~exists); // if this track exists make it larger than all non-existing tracks
      //else  larger[i] = 0; // else make it smaller than anything
      if (exists[i])
        larger[i][j] = larger[i][j] | (!exists[j]);
      else
        larger[i][j] = false;
    }
  }
 
  if (verbose_ > 0) {  // debug
    std::cout << "exists: ";
    for (i = max_hzn - 1; i >= 0; --i) {
      std::cout << exists[i];
      if ((i % max_zn) == 0 && i != 0)
        std::cout << "_";
    }
    std::cout << std::endl;
    std::cout << "killed: ";
    for (i = max_hzn - 1; i >= 0; --i) {
      std::cout << killed[i];
      if ((i % max_zn) == 0 && i != 0)
        std::cout << "_";
    }
    std::cout << std::endl;
    for (j = 0; j < max_hzn; ++j) {
      std::cout << "larger: ";
      for (i = max_hzn - 1; i >= 0; --i) {
        std::cout << larger[j][i];
        if ((i % max_zn) == 0 && i != 0)
          std::cout << "_";
      }
      std::cout << std::endl;
    }
  }
 
  // count zeros in the comparison results. The best track will have none, the next will have one, the third will have two
  for (i = 0; i < max_hzn; ++i) {
    sum = 0;
    for (j = 0; j < max_hzn; ++j) {
      if (larger[i][j] == 0)
        sum += 1;
    }
 
    if (sum < maxTracks_) {
      winner[sum][i] = true;  // assign positional winner codes
    }
 
    if (sum < maxTracks_ && bugSameSectorPt0_ && sum > 0) {
      // just keep the best track and kill the rest of them
      winner[sum][i] = false;
    }
  }
 
  // Output best tracks according to winner signals
  best_tracks.clear();
 
  for (int o = 0; o < maxTracks_; ++o) {  // output candidate loop
    int h = 0, n = 0, z = 0;
    for (i = 0; i < max_hzn; ++i) {  // winner bit loop
      if (winner[o][i]) {
        h = (i / max_z / max_n);
        n = (i / max_z) % max_n;
        z = i % max_z;
 
        const EMTFTrackCollection& tracks = extended_best_track_cands.at(h * max_z + z);
        const EMTFTrack& track = tracks.at(n);
        best_tracks.push_back(track);
 
        // Update winner, BX
        best_tracks.back().set_track_num(best_tracks.size() - 1);
        best_tracks.back().set_winner(o);
        best_tracks.back().set_bx(best_tracks.back().Second_BX());
      }
    }
  }
}

References bx_, bxWindow_, gather_cfg::cout, emtf_assert, spr::find(), h, mps_fire::i, dqmiolumiharvest::j, mps_check::killed, maxRoadsPerZone_, maxTracks_, dqmiodumpmetadata::n, emtf::NUM_ZONES, EcalTangentSkim_cfg::o, HLT_2018_cff::track, PDWG_EXOHSCP_cff::tracks, verbose_, and z.

Referenced by process().

cancel_one_bx()

void BestTrackSelection::cancel_one_bx	(	const std::deque< EMTFTrackCollection > &	extended_best_track_cands,
		EMTFTrackCollection &	best_tracks
	)		const

Definition at line 64 of file BestTrackSelection.cc.

                                                                               {
  const int max_z = emtf::NUM_ZONES;   // = 4 zones
  const int max_n = maxRoadsPerZone_;  // = 3 candidates per zone
  const int max_zn = max_z * max_n;    // = 12 total candidates
  emtf_assert(maxTracks_ <= max_zn);
 
  // Emulate the arrays used in firmware
  typedef std::array<int, 3> segment_ref_t;
  std::vector<std::vector<segment_ref_t> > segments(max_zn,
                                                    std::vector<segment_ref_t>());  // 2D array [zn][num segments]
 
  std::vector<std::vector<bool> > larger(max_zn, std::vector<bool>(max_zn, false));  // 2D array [zn][zn]
  std::vector<std::vector<bool> > winner(max_zn, std::vector<bool>(max_zn, false));
 
  std::vector<bool> exists(max_zn, false);  // 1D array [zn]
  std::vector<bool> killed(max_zn, false);
  std::vector<int> rank(max_zn, 0);
  //std::vector<int>  good_bx(max_zn, 0);
 
  // Initialize arrays: rank, segments
  for (int z = 0; z < max_z; ++z) {
    const EMTFTrackCollection& tracks = extended_best_track_cands.at(z);
    const int ntracks = tracks.size();
    emtf_assert(ntracks <= max_n);
 
    for (int n = 0; n < ntracks; ++n) {
      const int zn = (n * max_z) + z;  // for (i = 0; i < 12; i = i+1) rank[i%4][i/4]
      const EMTFTrack& track = tracks.at(n);
 
      rank.at(zn) = track.Rank();
 
      for (const auto& conv_hit : track.Hits()) {
        emtf_assert(conv_hit.Valid());
 
        // A segment identifier (chamber, strip, bx)
        const segment_ref_t segment = {{conv_hit.PC_station() * 9 + conv_hit.PC_chamber(),
                                        (conv_hit.PC_segment() % 2),
                                        0}};  // FW doesn't check whether a segment is CSC or RPC
        //int chamber_index  = int(conv_hit.Subsystem() == TriggerPrimitive::kRPC)*9*5;
        //chamber_index     += conv_hit.PC_station()*9;
        //chamber_index     += conv_hit.PC_chamber();
        //const segment_ref_t segment = {{chamber_index, conv_hit.Strip(), 0}};
        segments.at(zn).push_back(segment);
      }
    }  // end loop over n
  }    // end loop over z
 
  // Simultaneously compare each rank with each other
  int i = 0, j = 0, ri = 0, rj = 0, gt = 0, eq = 0, sum = 0;
 
  for (i = 0; i < max_zn; ++i) {
    for (j = 0; j < max_zn; ++j) {
      larger[i][j] = false;
    }
    larger[i][i] = true;  // result of comparison with itself
    //ri = rank[i%4][i/4]; // first index loops zone, second loops candidate. Zone loops faster, so we give equal priority to zones
    ri = rank[i];
 
    for (j = 0; j < max_zn; ++j) {
      // i&j bits show which rank is larger
      // the comparison scheme below avoids problems
      // when there are two or more tracks with the same rank
      //rj = rank[j%4][j/4];
      rj = rank[j];
      gt = ri > rj;
      eq = ri == rj;
      if ((i < j && (gt || eq)) || (i > j && gt))
        larger[i][j] = true;
    }
    // "larger" array shows the result of comparison for each rank
 
    // track exists if quality != 0
    exists[i] = (ri != 0);
  }
 
  // ghost cancellation, only in the current BX so far
  for (i = 0; i < max_zn - 1; ++i) {    // candidate loop
    for (j = i + 1; j < max_zn; ++j) {  // comparison candidate loop
      int shared_segs = 0;
 
      // count shared segments
      for (const auto& isegment : segments.at(i)) {  // loop over all pairs of hits
        for (const auto& jsegment : segments.at(j)) {
          if (isegment == jsegment) {  // same chamber and same segment
            shared_segs += 1;
          }
        }
      }
 
      if (shared_segs > 0) {  // a single shared segment means it's ghost
        // kill candidate that has lower rank
        if (larger[i][j])
          killed[j] = true;
        else
          killed[i] = true;
      }
    }
  }
 
  // remove ghosts according to kill mask
  //exists = exists & (~kill1);
  for (i = 0; i < max_zn; ++i) {
    exists[i] = exists[i] & (!killed[i]);
  }
 
  bool anything_exists = (std::find(exists.begin(), exists.end(), 1) != exists.end());
  if (!anything_exists)
    return;
 
  // update "larger" array
  for (i = 0; i < max_zn; ++i) {
    for (j = 0; j < max_zn; ++j) {
      //if  (exists[i]) larger[i] = larger[i] | (~exists); // if this track exists make it larger than all non-existing tracks
      //else  larger[i] = 0; // else make it smaller than anything
      if (exists[i])
        larger[i][j] = larger[i][j] | (!exists[j]);
      else
        larger[i][j] = false;
    }
  }
 
  if (verbose_ > 0) {  // debug
    std::cout << "exists: ";
    for (i = max_zn - 1; i >= 0; --i) {
      std::cout << exists[i];
    }
    std::cout << std::endl;
    std::cout << "killed: ";
    for (i = max_zn - 1; i >= 0; --i) {
      std::cout << killed[i];
    }
    std::cout << std::endl;
    for (j = 0; j < max_zn; ++j) {
      std::cout << "larger: ";
      for (i = max_zn - 1; i >= 0; --i) {
        std::cout << larger[j][i];
      }
      std::cout << std::endl;
    }
  }
 
  // count zeros in the comparison results. The best track will have none, the next will have one, the third will have two
  // skip the bits corresponding to the comparison of the track with itself
  for (i = 0; i < max_zn; ++i) {
    sum = 0;
    for (j = 0; j < max_zn; ++j) {
      if (larger[i][j] == 0)
        sum += 1;
    }
 
    if (sum < maxTracks_) {
      winner[sum][i] = true;  // assign positional winner codes
    }
 
    if (sum < maxTracks_ && bugSameSectorPt0_ && sum > 0) {
      // just keep the best track and kill the rest of them
      winner[sum][i] = false;
    }
  }
 
  // Output best tracks according to winner signals
  best_tracks.clear();
 
  for (int o = 0; o < maxTracks_; ++o) {  // output candidate loop
    int z = 0, n = 0;
    for (i = 0; i < max_zn; ++i) {  // winner bit loop
      if (winner[o][i]) {
        n = i / max_z;
        z = i % max_z;
 
        const EMTFTrackCollection& tracks = extended_best_track_cands.at(z);
        const EMTFTrack& track = tracks.at(n);
        best_tracks.push_back(track);
 
        // Update winner, BX
        best_tracks.back().set_track_num(best_tracks.size() - 1);
        best_tracks.back().set_winner(o);
        best_tracks.back().set_bx(best_tracks.back().First_BX());
      }
    }
  }
}

References gather_cfg::cout, emtf_assert, edm::eq(), spr::find(), mps_fire::i, dqmiolumiharvest::j, mps_check::killed, maxRoadsPerZone_, maxTracks_, dqmiodumpmetadata::n, emtf::NUM_ZONES, EcalTangentSkim_cfg::o, HLT_2018_cff::track, PDWG_EXOHSCP_cff::tracks, verbose_, and z.

Referenced by process().

configure()

void BestTrackSelection::configure	(	int	verbose,
		int	endcap,
		int	sector,
		int	bx,
		int	bxWindow,
		int	maxRoadsPerZone,
		int	maxTracks,
		bool	useSecondEarliest,
		bool	bugSameSectorPt0
	)

Definition at line 5 of file BestTrackSelection.cc.

                                                          {
  verbose_ = verbose;
  endcap_ = endcap;
  sector_ = sector;
  bx_ = bx;
 
  bxWindow_ = bxWindow;
  maxRoadsPerZone_ = maxRoadsPerZone;
  maxTracks_ = maxTracks;
  useSecondEarliest_ = useSecondEarliest;
  bugSameSectorPt0_ = bugSameSectorPt0;
}

References bugSameSectorPt0_, l1GtPatternGenerator_cfi::bx, bx_, bxWindow_, makeMuonMisalignmentScenario::endcap, endcap_, maxRoadsPerZone_, HLT_2018_cff::maxTracks, maxTracks_, sector_, useSecondEarliest_, verbose, and verbose_.

Referenced by SectorProcessor::process_single_bx().

process()

void BestTrackSelection::process	(	const std::deque< EMTFTrackCollection > &	extended_best_track_cands,
		EMTFTrackCollection &	best_tracks
	)		const

Definition at line 26 of file BestTrackSelection.cc.

                                                                         {
  int num_cands = 0;
  for (const auto& cands : extended_best_track_cands) {
    for (const auto& cand : cands) {
      if (cand.Rank() > 0) {
        num_cands += 1;
      }
    }
  }
  bool early_exit = (num_cands == 0);
 
  if (early_exit)
    return;
 
  if (!useSecondEarliest_) {
    cancel_one_bx(extended_best_track_cands, best_tracks);
  } else {
    cancel_multi_bx(extended_best_track_cands, best_tracks);
  }
 
  if (verbose_ > 0) {  // debug
    for (const auto& track : best_tracks) {
      std::cout << "track: " << track.Winner() << " rank: " << to_hex(track.Rank())
                << " ph_deltas: " << array_as_string(track.PtLUT().delta_ph)
                << " th_deltas: " << array_as_string(track.PtLUT().delta_th) << " phi: " << track.Phi_fp()
                << " theta: " << track.Theta_fp() << " cpat: " << array_as_string(track.PtLUT().cpattern)
                << " bx: " << track.BX() << std::endl;
      for (int i = 0; i < emtf::NUM_STATIONS + 1; ++i) {  // stations 0-4
        if (track.PtLUT().bt_vi[i] != 0)
          std::cout << ".. track segments: st: " << i << " v: " << track.PtLUT().bt_vi[i]
                    << " h: " << track.PtLUT().bt_hi[i] << " c: " << track.PtLUT().bt_ci[i]
                    << " s: " << track.PtLUT().bt_si[i] << std::endl;
      }
    }
  }
}

References cancel_multi_bx(), cancel_one_bx(), HLT_2018_cff::cands, gather_cfg::cout, mps_fire::i, emtf::NUM_STATIONS, to_hex(), HLT_2018_cff::track, useSecondEarliest_, and verbose_.

Referenced by SectorProcessor::process_single_bx().

Member Data Documentation

bugSameSectorPt0_

bool BestTrackSelection::bugSameSectorPt0_

private

Definition at line 33 of file BestTrackSelection.h.

Referenced by configure().

bx_

int BestTrackSelection::bx_

private

Definition at line 28 of file BestTrackSelection.h.

Referenced by cancel_multi_bx(), and configure().

bxWindow_

int BestTrackSelection::bxWindow_

private

Definition at line 30 of file BestTrackSelection.h.

Referenced by cancel_multi_bx(), and configure().

endcap_

int BestTrackSelection::endcap_

private

Definition at line 28 of file BestTrackSelection.h.

Referenced by configure().

maxRoadsPerZone_

int BestTrackSelection::maxRoadsPerZone_

private

Definition at line 31 of file BestTrackSelection.h.

Referenced by cancel_multi_bx(), cancel_one_bx(), and configure().

maxTracks_

int BestTrackSelection::maxTracks_

private

Definition at line 31 of file BestTrackSelection.h.

Referenced by cancel_multi_bx(), cancel_one_bx(), and configure().

sector_

int BestTrackSelection::sector_

private

Definition at line 28 of file BestTrackSelection.h.

Referenced by configure().

useSecondEarliest_

bool BestTrackSelection::useSecondEarliest_

private

Definition at line 32 of file BestTrackSelection.h.

Referenced by configure(), and process().

verbose_

int BestTrackSelection::verbose_

private

Definition at line 28 of file BestTrackSelection.h.

Referenced by cancel_multi_bx(), cancel_one_bx(), configure(), and process().