Belle II Software development
Public Types | Public Member Functions | Protected Types | Protected Member Functions | Private Types | Private Attributes | List of all members
TrackCombiner Class Referenceabstract

Combines two sets of tracks to one final set by merging tracks that have large overlaps. More...

#include <TrackCombiner.h>

Inheritance diagram for TrackCombiner:
Findlet< const CDCTrack, const CDCTrack, CDCTrack > CompositeProcessingSignalListener ProcessingSignalListener

Public Types

using IOTypes
 Types that should be served to apply on invocation.
 
using IOVectors
 Vector types that should be served to apply on invocation.
 

Public Member Functions

 TrackCombiner ()
 Default constructor.
 
std::string getDescription () final
 Short description of the findlet.
 
void exposeParameters (ModuleParamList *moduleParamList, const std::string &prefix) final
 Expose the parameters to a module.
 
void apply (const std::vector< CDCTrack > &inputTracks, const std::vector< CDCTrack > &secondInputTracks, std::vector< CDCTrack > &tracks) final
 Main algorithm.
 
virtual void apply (ToVector< AIOTypes > &... ioVectors)=0
 Main function executing the algorithm.
 
void initialize () override
 Receive and dispatch signal before the start of the event processing.
 
void beginRun () override
 Receive and dispatch signal for the beginning of a new run.
 
void beginEvent () override
 Receive and dispatch signal for the start of a new event.
 
void endRun () override
 Receive and dispatch signal for the end of the run.
 
void terminate () override
 Receive and dispatch Signal for termination of the event processing.
 

Protected Types

using ToVector
 Short hand for ToRangeImpl.
 

Protected Member Functions

void addProcessingSignalListener (ProcessingSignalListener *psl)
 Register a processing signal listener to be notified.
 
int getNProcessingSignalListener ()
 Get the number of currently registered listeners.
 

Private Types

using Super = Findlet<const CDCTrack, const CDCTrack, CDCTrack>
 Type of the base class.
 

Private Attributes

bool m_param_identifyCommonSegments = false
 Parameter : Activate the identification of common segments.
 
MultipassCellularPathFinder< const CDCSegment3D > m_cellularPathFinder
 Instance of the cellular automaton path finder.
 
std::vector< ProcessingSignalListener * > m_subordinaryProcessingSignalListeners
 References to subordinary signal processing listener contained in this findlet.
 
bool m_initialized
 Flag to keep track whether initialization happened before.
 
bool m_terminated
 Flag to keep track whether termination happened before.
 
std::string m_initializedAs
 Name of the type during initialisation.
 

Detailed Description

Combines two sets of tracks to one final set by merging tracks that have large overlaps.

Definition at line 28 of file TrackCombiner.h.

Member Typedef Documentation

◆ IOTypes

using IOTypes
inherited

Types that should be served to apply on invocation.

Definition at line 30 of file Findlet.h.

◆ IOVectors

using IOVectors
inherited

Vector types that should be served to apply on invocation.

Definition at line 53 of file Findlet.h.

◆ Super

using Super = Findlet<const CDCTrack, const CDCTrack, CDCTrack>
private

Type of the base class.

Definition at line 32 of file TrackCombiner.h.

◆ ToVector

using ToVector
protectedinherited

Short hand for ToRangeImpl.

Definition at line 49 of file Findlet.h.

Member Function Documentation

◆ addProcessingSignalListener()

void addProcessingSignalListener ( ProcessingSignalListener * psl)
protectedinherited

Register a processing signal listener to be notified.

Definition at line 53 of file CompositeProcessingSignalListener.cc.

56{
57 m_subordinaryProcessingSignalListeners.push_back(psl);
58}
Belle2::TrackFindingCDC::Findlet
Interface for a minimal algorithm part that wants to expose some parameters to a module.
Definition Findlet.h:26

◆ apply()

void apply ( const std::vector< CDCTrack > & inputTracks,
const std::vector< CDCTrack > & secondInputTracks,
std::vector< CDCTrack > & tracks )
final

Main algorithm.

Definition at line 97 of file TrackCombiner.cc.

100{
101 using InTracks = std::array<const CDCTrack*, 2>;
102
103 // Constructing map of back links
104 std::map<const CDCWireHit*, InTracks> inTracksByWireHit;
105 for (const CDCTrack& track : inputTracks) {
106 for (const CDCRecoHit3D& recoHit3D : track) {
107 const CDCWireHit& wireHit = recoHit3D.getWireHit();
108 if (inTracksByWireHit.count(&wireHit) == 0) inTracksByWireHit[&wireHit] = {nullptr, nullptr};
109 inTracksByWireHit[&wireHit][0] = &track;
110 // Prepare hits for the cellular automaton
111 wireHit->unsetTemporaryFlags();
112 wireHit->unsetMaskedFlag();
113 }
114 }
115
116 for (const CDCTrack& track : secondInputTracks) {
117 for (const CDCRecoHit3D& recoHit3D : track) {
118 const CDCWireHit& wireHit = recoHit3D.getWireHit();
119 if (inTracksByWireHit.count(&wireHit) == 0) inTracksByWireHit[&wireHit] = {nullptr, nullptr};
120 inTracksByWireHit[&wireHit][1] = &track;
121 // Prepare hits for the cellular automaton
122 wireHit->unsetTemporaryFlags();
123 wireHit->unsetMaskedFlag();
124 }
125 }
126
127 // Rank tracks by number of superlayers touched first and number of hits second
128 std::vector<std::pair<std::pair<int, size_t>, const CDCTrack*> > rankedTracks;
129 for (const CDCTrack& track : inputTracks) {
130 std::array<int, ISuperLayerUtil::c_N> nHitsBySLayer = getNHitsByISuperLayer(track);
131 int nSL = std::count_if(nHitsBySLayer.begin(), nHitsBySLayer.end(), Id() > 0);
132 rankedTracks.push_back({{nSL, track.size()}, &track});
133 }
134 for (const CDCTrack& track : secondInputTracks) {
135 std::array<int, ISuperLayerUtil::c_N> nHitsBySLayer = getNHitsByISuperLayer(track);
136 int nSL = std::count_if(nHitsBySLayer.begin(), nHitsBySLayer.end(), Id() > 0);
137 rankedTracks.push_back({{nSL, track.size()}, &track});
138 }
139 std::sort(rankedTracks.begin(), rankedTracks.end(), GreaterOf<First>());
140
141 // Memory for the split segments
142 std::deque<CDCSegment3D> segments;
143
144 // Memory for the relations between tracks to be followed on linking
145 std::vector<WeightedRelation<const CDCSegment3D>> segmentRelations;
146
147 // Also keep a record to which of the tracks the segment
148 std::map<const CDCSegment3D*, InTracks> inTracksBySegment;
149
150 // Split tracks into segments - break segment such that there will be matching pieces with the other tracks
151 for (const std::pair<std::pair<int, size_t>, const CDCTrack*>& rankedTrack : rankedTracks) {
152 // const std::pair<ISuperLayer, size_t> rank = rankedTrack.first;
153 const CDCTrack* track = rankedTrack.second;
154 std::vector<std::pair<InTracks, CDCSegment3D> > segmentsInTrack;
155
156 // Split track into segments
157 CDCSegment3D* currentSegment = nullptr;
158 ISuperLayer lastISuperLayer = -1;
159 InTracks lastTracksForHit{{nullptr, nullptr}};
160 for (const CDCRecoHit3D& recoHit3D : *track) {
161 ISuperLayer iSuperLayer = recoHit3D.getISuperLayer();
162 std::array<const CDCTrack*, 2> tracksForWireHit = inTracksByWireHit[&recoHit3D.getWireHit()];
163 if (not currentSegment or iSuperLayer != lastISuperLayer or tracksForWireHit != lastTracksForHit) {
164 // Make new segments
165 segmentsInTrack.push_back({tracksForWireHit, CDCSegment3D()});
166 currentSegment = &segmentsInTrack.back().second;
167 currentSegment->setTrajectory3D(track->getStartTrajectory3D());
168 }
169 currentSegment->push_back(recoHit3D);
170 lastISuperLayer = iSuperLayer;
171 lastTracksForHit = tracksForWireHit;
172 }
173
174 // Merge small segments
175 auto absorbsSegment = [](std::pair<InTracks, CDCSegment3D>& segment1,
176 std::pair<InTracks, CDCSegment3D>& segment2) {
177
178 if (segment1.second.getISuperLayer() != segment2.second.getISuperLayer()) return false;
179 if (segment1.second.size() < 3) {
180 segment1.first = segment2.first;
181 }
182 // Absorb segment1 into segment2
183 if (segment1.second.size() < 3 or segment2.second.size() < 3 or
184 segment1.first == segment2.first) {
185 segment1.second.insert(segment1.second.end(),
186 segment2.second.begin(),
187 segment2.second.end());
188 return true;
189 }
190 return false;
191 };
192 auto itSegmentToDrop = std::unique(segmentsInTrack.begin(), segmentsInTrack.end(), absorbsSegment);
193 segmentsInTrack.erase(itSegmentToDrop, segmentsInTrack.end());
194
195 size_t nHits = 0;
196 for (std::pair<InTracks, CDCSegment3D>& segment : segmentsInTrack) {
197 nHits += segment.second.size();
198 }
199 B2ASSERT("Expected the number of hits to be the same", nHits == track->size());
200
201 // Push segments to the common pool
202 const CDCSegment3D* lastSegment = nullptr;
203 for (std::pair<InTracks, CDCSegment3D>& segmentInTrack : segmentsInTrack) {
204 const InTracks& inTracks = segmentInTrack.first;
205 const CDCSegment3D& segment = segmentInTrack.second;
206 segment->setCellWeight(segment.size());
207 segments.push_back(std::move(segment));
208 inTracksBySegment[&segments.back()] = inTracks;
209 if (lastSegment != nullptr) {
210 segmentRelations.push_back({lastSegment, 0, &segments.back()});
211 }
212 lastSegment = &segments.back();
213 }
214 }
215
216 // Sort the relations for the lookup
217 std::sort(segmentRelations.begin(), segmentRelations.end());
218
219 // Identify common segments, also checking whether they have the same orientation
220 if (m_param_identifyCommonSegments) {
221 std::vector<std::pair<const CDCSegment3D*, const CDCSegment3D*>> segmentContainmentRelation;
222 for (auto itSegment1 = segments.begin(); itSegment1 != segments.end(); ++itSegment1) {
223 const CDCSegment3D& segment1 = *itSegment1;
224 std::vector<CDCRLWireHit> rlWireHits1 = getRLWireHitSegment(segment1);
225 ISuperLayer iSL1 = segment1.getISuperLayer();
226 InTracks inTracks1 = inTracksBySegment[&segment1];
227 for (auto itSegment2 = itSegment1 + 1; itSegment2 != segments.end(); ++itSegment2) {
228 const CDCSegment3D& segment2 = *itSegment2;
229
230 // Should not happen - here for safety reasons
231 if (&segment1 == &segment2) continue;
232
233 ISuperLayer iSL2 = segment2.getISuperLayer();
234 if (iSL1 != iSL2) continue;
235
236 InTracks inTracks2 = inTracksBySegment[&segment2];
237 if (inTracks1 != inTracks2) continue;
238
239 // Now answering the question if segment 1 is contained in segment 2
240 std::vector<CDCRLWireHit> rlWireHits2 = getRLWireHitSegment(segment2);
241 std::vector<std::pair<std::pair<int, int>, CDCRLWireHit>> commonRLWireHits =
242 getCommonRLWireHits(rlWireHits1, rlWireHits2);
243
244 // Check for containment, requiring that the majority of the wire hits of one is in two
245 // However also require that the two is not too much larger compared to the first one
246 bool contains = commonRLWireHits.size() > 2 and
247 commonRLWireHits.size() > rlWireHits1.size() * 0.8 and
248 commonRLWireHits.size() > rlWireHits2.size() * 0.8;
249 if (not contains) continue;
250
251 // Now finally check whether both segments point in the same direction
252 double n = commonRLWireHits.size();
253 double prod11 = 0;
254 double prod12 = 0;
255 double prod22 = 0;
256 double sum1 = 0;
257 double sum2 = 0;
258 for (const auto& commonRLWireHit : commonRLWireHits) {
259 const std::pair<int, int>& indices = commonRLWireHit.first;
260 prod11 += indices.first * indices.first;
261 prod12 += indices.first * indices.second;
262 prod22 += indices.second * indices.second;
263
264 sum1 += indices.first;
265 sum2 += indices.second;
266 }
267 double var1 = (prod11 - sum1 * sum1 / n);
268 double var2 = (prod22 - sum2 * sum2 / n);
269 double cov12 = (prod12 - sum1 * sum2 / n);
270 double cor = cov12 / std::sqrt(var1 * var2);
271 if (not(cor > 0.75)) continue;
272
273 segmentContainmentRelation.push_back({&segment1, &segment2});
274 }
275 }
276
277 // Create additional edges
278 std::vector<WeightedRelation<const CDCSegment3D>> additionalSegmentRelations;
279 for (std::pair<const CDCSegment3D*, const CDCSegment3D*>& rel : segmentContainmentRelation) {
280 for (WeightedRelation<const CDCSegment3D> rel1 :
281 asRange(std::equal_range(segmentRelations.begin(), segmentRelations.end(), rel.first))) {
282 additionalSegmentRelations.push_back({rel.second, 0, rel1.getTo()});
283 }
284
285 for (WeightedRelation<const CDCSegment3D> rel2 : asRange(
286 std::equal_range(segmentRelations.begin(), segmentRelations.end(), rel.second))) {
287 additionalSegmentRelations.push_back({rel.first, 0, rel2.getFrom()});
288 }
289 }
290 segmentRelations.insert(segmentRelations.end(),
291 additionalSegmentRelations.begin(),
292 additionalSegmentRelations.end());
293 std::sort(segmentRelations.begin(), segmentRelations.end());
294 }
295
296 // Extract paths
297 // Obtain the segments as pointers
298 std::vector<const CDCSegment3D*> segmentPtrs = as_pointers<const CDCSegment3D>(segments);
299
300 // Memory for the track paths generated from the graph.
301 std::vector<TrackFindingCDC::Path<const CDCSegment3D>> segmentPaths;
302 m_cellularPathFinder.apply(segmentPtrs, segmentRelations, segmentPaths);
303
304 // Put the linked segments together
305 outputTracks.clear();
306 for (const std::vector<const CDCSegment3D*>& segmentPath : segmentPaths) {
307 // Reject single left over segments
308 if (segmentPath.size() < 2) continue;
309 outputTracks.push_back(condense(segmentPath));
310 }
311
312 // Simple approach
313 // Incorporate the second input tracks in to the first input tracks by looking for large overlaps
314 // Very simple approach use the first tracks and add the ones from the second tracks with no overlap to the first
315 // outputTracks.insert(outputTracks.end(), inputTracks.begin(), inputTracks.end());
316 // for (const CDCTrack& secondTrack : secondInputTracks) {
317 // std::map<const CDCTrack*, int> overlappingTracks;
318 // for (const CDCRecoHit3D& recoHit3D : secondTrack) {
319 // const CDCWireHit& wireHit = recoHit3D.getWireHit();
320 // inTracksByWireHit.equal_range(&recoHit3D.getWireHit());
321 // auto tracksForWireHit = asRange(inTracksByWireHit.equal_range(&wireHit));
322 // for (const std::pair<const CDCWireHit*, InTracks>& trackForWireHit : inTracksByWireHit) {
323 // const CDCTrack* track = trackForWireHit.second[0];
324 // if (not track) continue;
325 // overlappingTracks[track]++;
326 // }
327 // }
328 // if (overlappingTracks.size() == 0) {
329 // outputTracks.push_back(secondTrack);
330 // }
331 // }
332}
Belle2::TrackFindingCDC::AutomatonCell::unsetMaskedFlag
void unsetMaskedFlag()
Resets the masked flag to false.
Definition AutomatonCell.h:212
Belle2::TrackFindingCDC::AutomatonCell::unsetTemporaryFlags
void unsetTemporaryFlags()
Resets the assigned, start and cycle marker flag.
Definition AutomatonCell.h:200
Belle2::TrackFindingCDC::CDCSegment::getISuperLayer
ISuperLayer getISuperLayer() const
Returns the common super layer id of all stored tracking hits.
Definition CDCSegment.h:57
Belle2::TrackFindingCDC::TrackCombiner::m_cellularPathFinder
MultipassCellularPathFinder< const CDCSegment3D > m_cellularPathFinder
Instance of the cellular automaton path finder.
Definition TrackCombiner.h:56
Belle2::TrackFindingCDC::TrackCombiner::m_param_identifyCommonSegments
bool m_param_identifyCommonSegments
Parameter : Activate the identification of common segments.
Definition TrackCombiner.h:52

◆ beginEvent()

void beginEvent ( )
overrideinherited

Receive and dispatch signal for the start of a new event.

Definition at line 36 of file CompositeProcessingSignalListener.cc.

32{
33 Super::beginEvent();
34 for (ProcessingSignalListener* psl : m_subordinaryProcessingSignalListeners) {
35 psl->beginEvent();
36 }
37}
Belle2::TrackFindingCDC::CompositeProcessingSignalListener::beginEvent
void beginEvent() override
Receive and dispatch signal for the start of a new event.
Definition CompositeProcessingSignalListener.cc:31
Belle2::TrackFindingCDC::ProcessingSignalListener::beginEvent
virtual void beginEvent()
Receive signal for the start of a new event.
Definition ProcessingSignalListener.cc:45

◆ beginRun()

void beginRun ( )
overrideinherited

Receive and dispatch signal for the beginning of a new run.

Definition at line 33 of file CompositeProcessingSignalListener.cc.

24{
25 Super::beginRun();
26 for (ProcessingSignalListener* psl : m_subordinaryProcessingSignalListeners) {
27 psl->beginRun();
28 }
29}
Belle2::TrackFindingCDC::CompositeProcessingSignalListener::beginRun
void beginRun() override
Receive and dispatch signal for the beginning of a new run.
Definition CompositeProcessingSignalListener.cc:23
Belle2::TrackFindingCDC::ProcessingSignalListener::beginRun
virtual void beginRun()
Receive signal for the beginning of a new run.
Definition ProcessingSignalListener.cc:38

◆ endRun()

void endRun ( )
overrideinherited

Receive and dispatch signal for the end of the run.

Definition at line 39 of file CompositeProcessingSignalListener.cc.

40{
41 for (ProcessingSignalListener* psl : reversedRange(m_subordinaryProcessingSignalListeners)) {
42 psl->endRun();
43 }
44 Super::endRun();
45}
Belle2::TrackFindingCDC::CompositeProcessingSignalListener::endRun
void endRun() override
Receive and dispatch signal for the end of the run.
Definition CompositeProcessingSignalListener.cc:39
Belle2::TrackFindingCDC::ProcessingSignalListener::endRun
virtual void endRun()
Receive signal for the end of the run.
Definition ProcessingSignalListener.cc:52

◆ exposeParameters()

void exposeParameters ( ModuleParamList * moduleParamList,
const std::string & prefix )
finalvirtual

Expose the parameters to a module.

Reimplemented from CompositeProcessingSignalListener.

Definition at line 88 of file TrackCombiner.cc.

90{
91 moduleParamList->addParameter(prefixed(prefix, "identifyCommonSegments"),
92 m_param_identifyCommonSegments,
93 "Activate the identification of common segments",
94 m_param_identifyCommonSegments);
95}
Belle2::ModuleParamList::addParameter
void addParameter(const std::string &name, T &paramVariable, const std::string &description, const T &defaultValue)
Adds a new parameter to the module list.
Definition ModuleParamList.templateDetails.h:28

◆ getDescription()

std::string getDescription ( )
finalvirtual

Short description of the findlet.

Reimplemented from Findlet< const CDCTrack, const CDCTrack, CDCTrack >.

Definition at line 83 of file TrackCombiner.cc.

84{
85 return "Combines two sets of tracks to one final set by merging tracks that have large overlaps.";
86}

◆ getNProcessingSignalListener()

int getNProcessingSignalListener ( )
protectedinherited

Get the number of currently registered listeners.

Definition at line 56 of file CompositeProcessingSignalListener.cc.

61{
62 return m_subordinaryProcessingSignalListeners.size();
63}

◆ initialize()

void initialize ( )
overrideinherited

Receive and dispatch signal before the start of the event processing.

Definition at line 30 of file CompositeProcessingSignalListener.cc.

16{
17 Super::initialize();
18 for (ProcessingSignalListener* psl : m_subordinaryProcessingSignalListeners) {
19 psl->initialize();
20 }
21}
Belle2::TrackFindingCDC::CompositeProcessingSignalListener::initialize
void initialize() override
Receive and dispatch signal before the start of the event processing.
Definition CompositeProcessingSignalListener.cc:15
Belle2::TrackFindingCDC::ProcessingSignalListener::initialize
virtual void initialize()
Receive signal before the start of the event processing.
Definition ProcessingSignalListener.cc:28

◆ terminate()

void terminate ( )
overrideinherited

Receive and dispatch Signal for termination of the event processing.

Definition at line 42 of file CompositeProcessingSignalListener.cc.

48{
49 for (ProcessingSignalListener* psl : reversedRange(m_subordinaryProcessingSignalListeners)) {
50 psl->terminate();
51 }
52 Super::terminate();
53}
Belle2::TrackFindingCDC::CompositeProcessingSignalListener::terminate
void terminate() override
Receive and dispatch Signal for termination of the event processing.
Definition CompositeProcessingSignalListener.cc:47
Belle2::TrackFindingCDC::ProcessingSignalListener::terminate
virtual void terminate()
Receive Signal for termination of the event processing.
Definition ProcessingSignalListener.cc:59

Member Data Documentation

◆ m_cellularPathFinder

MultipassCellularPathFinder<const CDCSegment3D> m_cellularPathFinder
private

Instance of the cellular automaton path finder.

Definition at line 56 of file TrackCombiner.h.

◆ m_initialized

bool m_initialized
privateinherited

Flag to keep track whether initialization happened before.

Definition at line 52 of file ProcessingSignalListener.h.

◆ m_initializedAs

std::string m_initializedAs
privateinherited

Name of the type during initialisation.

Definition at line 58 of file ProcessingSignalListener.h.

◆ m_param_identifyCommonSegments

bool m_param_identifyCommonSegments = false
private

Parameter : Activate the identification of common segments.

Definition at line 52 of file TrackCombiner.h.

◆ m_subordinaryProcessingSignalListeners

std::vector<ProcessingSignalListener*> m_subordinaryProcessingSignalListeners
privateinherited

References to subordinary signal processing listener contained in this findlet.

Definition at line 60 of file CompositeProcessingSignalListener.h.

◆ m_terminated

bool m_terminated
privateinherited

Flag to keep track whether termination happened before.

Definition at line 55 of file ProcessingSignalListener.h.

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