|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#ifndef DataFormats_TrackSoA_interface_alpaka_TrackUtilities_h
#define DataFormats_TrackSoA_interface_alpaka_TrackUtilities_h
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <alpaka/alpaka.hpp>
#include "DataFormats/TrackSoA/interface/TracksSoA.h"
#include "Geometry/CommonTopologies/interface/SimplePixelTopology.h"
// Methods that operate on View and ConstView of the TrackSoA, and cannot be class methods.
template <typename TrackerTraits>
struct TracksUtilities {
using TrackSoAView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::View;
using TrackSoAConstView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::ConstView;
using hindex_type = typename reco::TrackSoA<TrackerTraits>::hindex_type;
// state at the beam spot: { phi, tip, 1/pt, cotan(theta), zip }
template <typename V3, typename M3, typename V2, typename M2>
ALPAKA_FN_HOST_ACC ALPAKA_FN_INLINE static constexpr void copyFromCircle(
TrackSoAView &tracks, V3 const &cp, M3 const &ccov, V2 const &lp, M2 const &lcov, float b, int32_t i) {
tracks[i].state() << cp.template cast<float>(), lp.template cast<float>();
tracks[i].state()(2) = tracks[i].state()(2) * b;
auto cov = tracks[i].covariance();
cov(0) = ccov(0, 0);
cov(1) = ccov(0, 1);
cov(2) = b * float(ccov(0, 2));
cov(4) = cov(3) = 0;
cov(5) = ccov(1, 1);
cov(6) = b * float(ccov(1, 2));
cov(8) = cov(7) = 0;
cov(9) = b * b * float(ccov(2, 2));
cov(11) = cov(10) = 0;
cov(12) = lcov(0, 0);
cov(13) = lcov(0, 1);
cov(14) = lcov(1, 1);
}
template <typename V5, typename M5>
ALPAKA_FN_HOST_ACC ALPAKA_FN_INLINE static constexpr void copyFromDense(TrackSoAView &tracks,
V5 const &v,
M5 const &cov,
int32_t i) {
tracks[i].state() = v.template cast<float>();
for (int j = 0, ind = 0; j < 5; ++j)
for (auto k = j; k < 5; ++k)
tracks[i].covariance()(ind++) = cov(j, k);
}
template <typename V5, typename M5>
ALPAKA_FN_HOST_ACC ALPAKA_FN_INLINE static constexpr void copyToDense(const TrackSoAConstView &tracks,
V5 &v,
M5 &cov,
int32_t i) {
v = tracks[i].state().template cast<typename V5::Scalar>();
for (int j = 0, ind = 0; j < 5; ++j) {
cov(j, j) = tracks[i].covariance()(ind++);
for (auto k = j + 1; k < 5; ++k)
cov(k, j) = cov(j, k) = tracks[i].covariance()(ind++);
}
}
ALPAKA_FN_HOST_ACC ALPAKA_FN_INLINE static constexpr int computeNumberOfLayers(const TrackSoAConstView &tracks,
int32_t i) {
auto pdet = tracks.detIndices().begin(i);
int nl = 1;
auto ol = pixelTopology::getLayer<TrackerTraits>(*pdet);
for (; pdet < tracks.detIndices().end(i); ++pdet) {
auto il = pixelTopology::getLayer<TrackerTraits>(*pdet);
if (il != ol)
++nl;
ol = il;
}
return nl;
}
ALPAKA_FN_HOST_ACC ALPAKA_FN_INLINE static constexpr int nHits(const TrackSoAConstView &tracks, int i) {
return tracks.detIndices().size(i);
}
};
namespace pixelTrack {
template <typename TrackerTraits, typename Enable = void>
struct QualityCutsT {};
template <typename TrackerTraits>
struct QualityCutsT<TrackerTraits, pixelTopology::isPhase1Topology<TrackerTraits>> {
using TrackSoAView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::View;
using TrackSoAConstView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::ConstView;
float chi2Coeff[4];
float chi2MaxPt; // GeV
float chi2Scale;
struct Region {
float maxTip; // cm
float minPt; // GeV
float maxZip; // cm
};
Region triplet;
Region quadruplet;
ALPAKA_FN_ACC ALPAKA_FN_INLINE bool isHP(const TrackSoAConstView &tracks, int nHits, int it) const {
// impose "region cuts" based on the fit results (phi, Tip, pt, cotan(theta)), Zip)
// default cuts:
// - for triplets: |Tip| < 0.3 cm, pT > 0.5 GeV, |Zip| < 12.0 cm
// - for quadruplets: |Tip| < 0.5 cm, pT > 0.3 GeV, |Zip| < 12.0 cm
// (see CAHitNtupletGeneratorGPU.cc)
auto const ®ion = (nHits > 3) ? quadruplet : triplet;
return (std::abs(reco::tip(tracks, it)) < region.maxTip) and (tracks.pt(it) > region.minPt) and
(std::abs(reco::zip(tracks, it)) < region.maxZip);
}
ALPAKA_FN_ACC ALPAKA_FN_INLINE bool strictCut(const TrackSoAConstView &tracks, int it) const {
auto roughLog = [](float x) {
// max diff [0.5,12] at 1.25 0.16143
// average diff 0.0662998
union IF {
uint32_t i;
float f;
};
IF z;
z.f = x;
uint32_t lsb = 1 < 21;
z.i += lsb;
z.i >>= 21;
auto f = z.i & 3;
int ex = int(z.i >> 2) - 127;
// log2(1+0.25*f)
// averaged over bins
const float frac[4] = {0.160497f, 0.452172f, 0.694562f, 0.901964f};
return float(ex) + frac[f];
};
float pt = std::min<float>(tracks.pt(it), chi2MaxPt);
float chi2Cut = chi2Scale * (chi2Coeff[0] + roughLog(pt) * chi2Coeff[1]);
if (tracks.chi2(it) >= chi2Cut) {
#ifdef NTUPLE_FIT_DEBUG
printf("Bad chi2 %d pt %f eta %f chi2 %f\n", it, tracks.pt(it), tracks.eta(it), tracks.chi2(it));
#endif
return true;
}
return false;
}
};
template <typename TrackerTraits>
struct QualityCutsT<TrackerTraits, pixelTopology::isPhase2Topology<TrackerTraits>> {
using TrackSoAView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::View;
using TrackSoAConstView = typename reco::TrackSoA<TrackerTraits>::template Layout<>::ConstView;
float maxChi2;
float minPt;
float maxTip;
float maxZip;
ALPAKA_FN_ACC ALPAKA_FN_INLINE bool isHP(const TrackSoAConstView &tracks, int nHits, int it) const {
return (std::abs(reco::tip(tracks, it)) < maxTip) and (tracks.pt(it) > minPt) and
(std::abs(reco::zip(tracks, it)) < maxZip);
}
ALPAKA_FN_ACC ALPAKA_FN_INLINE bool strictCut(const TrackSoAConstView &tracks, int it) const {
return tracks.chi2(it) >= maxChi2;
}
};
} // namespace pixelTrack
// TODO: Should those be placed in the ALPAKA_ACCELERATOR_NAMESPACE
template struct TracksUtilities<pixelTopology::Phase1>;
template struct TracksUtilities<pixelTopology::Phase2>;
#endif // DataFormats_TrackSoA_interface_alpaka_TrackUtilities_h
|