def get_interaction_neutrino_rec(frame,
primary,
convex_hull=None,
extend_boundary=0):
"""Get the first neutrino daughter of a primary neutrino, that interacted
inside the convex hull.
The I3MCTree is traversed to find the first interaction inside the convex
hull.
Parameters
----------
frame : I3Frame
Current I3Frame needed to retrieve I3MCTree
primary : I3Particle
Primary Nu Particle for which the cascade interaction is returned.
convex_hull : scipy.spatial.ConvexHull, optional
Defines the desired convex volume.
If None, the IceCube detector volume is assumed.
extend_boundary : float, optional
Extend boundary of IceCube detector by this distance [in meters].
This option is only used if convex_hull is None, e.g. if the IceCube
detector is used.
Returns
-------
I3Particle, None
Returns None if no interaction exists inside the convex hull
Returns the found neutrino as an I3Particle.
"""
if primary is None:
return None
mctree = frame['I3MCTree']
# traverse I3MCTree until first interaction inside the convex hull is found
daughters = mctree.get_daughters(primary)
# No daughters found, so no interaction
if len(daughters) is 0:
return None
# check if interaction point is inside
if convex_hull is None:
point_inside = geometry.is_in_detector_bounds(
daughters[0].pos, extend_boundary=extend_boundary)
else:
point_inside = geometry.point_is_inside(
convex_hull,
(daughters[0].pos.x, daughters[0].pos.y, daughters[0].pos.z))
if point_inside:
# interaction is inside the convex hull: neutrino found!
if primary.is_neutrino:
return primary
else:
return None
else:
# daughters are not inside convex hull.
# Either one of these daughters has secondary partcles which has an
# interaction inside, or there is no interaction within the convex hull
interaction_neutrinos = []
for n in daughters:
# check if this neutrino has interaction inside the convex hull
neutrino = get_interaction_neutrino_rec(frame, n, convex_hull,
extend_boundary)
if neutrino is not None:
interaction_neutrinos.append(neutrino)
if len(interaction_neutrinos) is 0:
# No neutrinos interacting in the convex hull could be found.
return None
if len(interaction_neutrinos) > 1:
print(interaction_neutrinos)
raise ValueError('Expected only one neutrino to interact!')
# Found a neutrino that had an interaction inside the convex hull
return interaction_neutrinos[0]
def get_labels(frame,
convex_hull,
domPosDict,
primary,
pulse_map_string='InIcePulses',
mcpe_series_map_name='I3MCPESeriesMap',
is_muongun=False):
'''Function to get extensive labels for muons, primary and general event
data.
Parameters
----------
frame : frame
convex_hull : scipy.spatial.ConvexHull
defining the desired convex volume
domPosDict : dict
Dictionary of form (string,key) : (x,y,z)
for all DOMs.
string and key are of type int
primary : I3Particle
Primary particle
pulse_map_string : key of pulse map in frame,
of which the mask should be computed for
mcpe_series_map_name : key of mcpe series map in frame
is_muongun : bool
In case of a MuonGun dataset, the primary neutrino has
an unknown type and a pdg_encoding of 0.
Therefore, the I3ParticleID of the primary needs to
be passed along to sub-functions.
Technically, this could be done implicity, by setting
the primary id. However, this will loosen up sanity
checks. Therefore, an explicit decision to use MuonGun
is prefered.
Returns
-------
labels : I3MapStringDouble
Dictionary with all labels
'''
if primary is None:
raise ValueError('Primary does not exist!')
assert primary.id is not None, 'MuonGunFix will not work if this is not true'
# Check if MuonGun dataset
if is_muongun:
# This loosens up sanity checks, therefore
# better to use only if it is really a
# MuonGun set.
# Should work for all datasets though,
# as long as a primary exists
# make sure it is a MuonGun dataset
assert primary.type_string == 'unknown', 'Expected unknown, got {}'.format(
primary.type_string)
assert primary.pdg_encoding == 0, 'Expected 0,got {}'.format(
primary.pdg_encoding)
# set primary particle id
muongun_primary_neutrino_id = primary.id
else:
muongun_primary_neutrino_id = None
# create empty labelDict
labels = dataclasses.I3MapStringDouble()
# get misc info
misc_info = get_misc_information(frame,
domPosDict,
convex_hull,
pulse_map_string=pulse_map_string,
mcpe_series_map_name=mcpe_series_map_name)
labels.update(misc_info)
muons_inside = mu_utils.get_muons_inside(frame, convex_hull)
labels['NoOfMuonsInside'] = len(muons_inside)
# get muons
mostEnergeticMuon = mu_utils.get_most_energetic_muon_inside(
frame, convex_hull, muons_inside=muons_inside)
highestEDepositMuon = mu_utils.get_highest_deposit_muon_inside(
frame, convex_hull, muons_inside=muons_inside)
mostVisibleMuon = mu_utils.get_most_visible_muon_inside(
frame,
convex_hull,
pulse_map_string=pulse_map_string,
mcpe_series_map_name=mcpe_series_map_name)
primaryMuon = mu_utils.get_muon_of_inice_neutrino(
frame, muongun_primary_neutrino_id=muongun_primary_neutrino_id)
labels['PrimaryMuonExists'] = not (primaryMuon is None)
labels['VisibleStartingTrack'] = False
for m in [
mostEnergeticMuon, highestEDepositMuon, mostVisibleMuon,
primaryMuon
]:
if m:
if geometry.is_in_detector_bounds(m.pos, extend_boundary=60):
labels['VisibleStartingTrack'] = True
# get labels for most energetic muon
mostEnergeticMuon_info = get_muon_information(
frame,
mostEnergeticMuon,
domPosDict,
convex_hull,
pulse_map_string=pulse_map_string)
for key in mostEnergeticMuon_info.keys():
labels['MostEnergeticMuon' + key] = mostEnergeticMuon_info[key]
# # get labels for highest deposit muon
# if highestEDepositMuon == mostEnergeticMuon:
# highestEDepositMuon_info = mostEnergeticMuon_info
# else:
# highestEDepositMuon_info = get_muon_information(frame,
# highestEDepositMuon, domPosDict, convex_hull,
# pulse_map_string=pulse_map_string)
# for key in highestEDepositMuon_info.keys():
# labels['HighestEDepositMuon'+key] = highestEDepositMuon_info[key]
# get labels for most visible muon
if mostVisibleMuon == mostEnergeticMuon:
mostVisibleMuon_info = mostEnergeticMuon_info
else:
mostVisibleMuon_info = get_muon_information(
frame,
mostVisibleMuon,
domPosDict,
convex_hull,
pulse_map_string=pulse_map_string)
for key in mostVisibleMuon_info.keys():
labels['MostVisibleMuon' + key] = mostVisibleMuon_info[key]
# get labels for muon from primary
if primaryMuon == mostEnergeticMuon:
primaryMuon_info = mostEnergeticMuon_info
elif primaryMuon == mostVisibleMuon:
primaryMuon_info = mostVisibleMuon_info
else:
primaryMuon_info = get_muon_information(
frame,
primaryMuon,
domPosDict,
convex_hull,
pulse_map_string=pulse_map_string)
for key in primaryMuon_info.keys():
labels['PrimaryMuon' + key] = primaryMuon_info[key]
# get labels for primary particle
primary_info = get_primary_information(
frame,
primary,
domPosDict,
convex_hull,
pulse_map_string=pulse_map_string,
muongun_primary_neutrino_id=muongun_primary_neutrino_id)
for key in primary_info.keys():
labels['Primary' + key] = primary_info[key]
return labels
def get_interaction_neutrino(frame,
primary,
convex_hull=None,
extend_boundary=0,
sanity_check=False):
"""Get the first neutrino daughter of a primary neutrino, that interacted
inside the convex hull.
The I3MCTree is traversed to find the first interaction inside the convex
hull.
Parameters
----------
frame : I3Frame
Current I3Frame needed to retrieve I3MCTree
primary : I3Particle
Primary Nu Particle for which the cascade interaction is returned.
convex_hull : scipy.spatial.ConvexHull, optional
Defines the desired convex volume.
If None, the IceCube detector volume is assumed.
extend_boundary : float, optional
Extend boundary of IceCube detector by this distance [in meters].
This option is only used if convex_hull is None, e.g. if the IceCube
detector is used.
sanity_check : bool, optional
If true, the neutrino is obtained by two different methods and cross
checked to see if results match.
Returns
-------
I3Particle, None
Returns None if no interaction exists inside the convex hull
Returns the found neutrino as an I3Particle.
Raises
------
ValueError
Description
"""
mctree = frame['I3MCTree']
# get first in ice neutrino
nu_in_ice = None
for p in mctree:
if p.is_neutrino and p.location_type_string == 'InIce':
nu_in_ice = p
break
if nu_in_ice is not None:
# check if nu_in_ice has interaction inside convex hull
daughters = mctree.get_daughters(nu_in_ice)
assert len(daughters) > 0, 'Expected at least one daughter!'
# check if point is inside
if convex_hull is None:
point_inside = geometry.is_in_detector_bounds(
daughters[0].pos, extend_boundary=extend_boundary)
else:
point_inside = geometry.point_is_inside(
convex_hull,
(daughters[0].pos.x, daughters[0].pos.y, daughters[0].pos.z))
if not point_inside:
nu_in_ice = None
# ---------------
# Sanity Check
# ---------------
if sanity_check:
nu_in_ice_rec = get_interaction_neutrino_rec(
frame=frame,
primary=primary,
convex_hull=convex_hull,
extend_boundary=extend_boundary)
if nu_in_ice_rec != nu_in_ice:
if (nu_in_ice_rec is None or nu_in_ice is None
or nu_in_ice_rec.id != nu_in_ice.id
or nu_in_ice_rec.minor_id != nu_in_ice.minor_id):
raise ValueError('{} != {}'.format(nu_in_ice_rec, nu_in_ice))
# ---------------
return nu_in_ice
def get_primary_information(frame,
primary,
dom_pos_dict,
convex_hull,
pulse_map_string='InIcePulses',
mcpe_series_map_name='I3MCPESeriesMap',
muongun_primary_neutrino_id=None):
'''Function to get labels for the primary
Parameters
----------
frame : frame
primary : I3Particle
Primary particle
dom_pos_dict : dict
Dictionary of form (string,key) : (x,y,z)
for all DOMs.
string and key are of type int
convex_hull : scipy.spatial.ConvexHull
defining the desired convex volume
pulse_map_string : key of pulse map in frame,
of which the pulses should be computed for
mcpe_series_map_name : key of mcpe series map in frame
muongun_primary_neutrino_id : I3ParticleID
In case of a MuonGun dataset, the primary neutrino has
an unknown type and a pdg_encoding of 0.
Therefore, the I3ParticleID of the primary needs to
be passed along.
Returns
-------
info_dict : dictionary
Dictionary with all labels
'''
info_dict = {}
# get labels depending on pulse map
pulse_map = general.get_pulse_map(
frame,
primary,
pulse_map_string=pulse_map_string,
mcpe_series_map_name=mcpe_series_map_name)
NoOfHitDOMs = len(pulse_map.keys())
NoOfPulses = 0
TotalCharge = 0.
COG = np.array([0., 0., 0.])
if NoOfHitDOMs > 0:
for key in pulse_map.keys():
for pulse in pulse_map[key]:
NoOfPulses += 1
TotalCharge += pulse.charge
pos = np.array(dom_pos_dict[(key.string, key.om)])
COG += pos * pulse.charge
COG = COG / TotalCharge
COG = dataclasses.I3Position(*COG)
COGDistanceToBorder = geometry.distance_to_icecube_hull(COG)
COGDistanceToDeepCore = geometry.distance_to_deepcore_hull(COG)
# other labels
daughters = frame['I3MCTree'].get_daughters(primary)
codes = [p.pdg_encoding for p in daughters]
if -13 in codes or 13 in codes:
# CC Interaction: nu + N -> mu + hadrons
IsCCInteraction = True
else:
# NC Interaction: nu + N -> nu + hadrons
IsCCInteraction = False
if geometry.is_in_detector_bounds(daughters[0].pos):
# Interaction of Primary is in Detector
IsStartingTrack = True
else:
# Interaction outside of Detector
IsStartingTrack = False
InDetectorEnergyLoss = get_energy_deposited_including_daughters(
frame,
convex_hull,
primary,
muongun_primary_neutrino_id=muongun_primary_neutrino_id)
# add labels to info_dict
info_dict['NoOfHitDOMs'] = NoOfHitDOMs
info_dict['NoOfPulses'] = NoOfPulses
info_dict['TotalCharge'] = TotalCharge
info_dict['COGDistanceToBorder'] = COGDistanceToBorder
info_dict['COGDistanceToDeepCore'] = COGDistanceToDeepCore
info_dict['COGx'] = COG.x
info_dict['COGy'] = COG.y
info_dict['COGz'] = COG.z
info_dict['Azimuth'] = primary.dir.azimuth
info_dict['Zenith'] = primary.dir.zenith
info_dict['Energy'] = primary.energy
info_dict['InDetectorEnergyLoss'] = InDetectorEnergyLoss
info_dict['IsCCInteraction'] = IsCCInteraction
info_dict['IsStartingTrack'] = IsStartingTrack
return info_dict
def get_total_deposited_energy(frame,
convex_hull=None,
extend_boundary=None,
cylinder_ext=None):
"""Get total deposited energy in an event.
Traverses the I3MCTree and collects energies of particles.
The particles are handled in the following:
dark particles: ignore
particles not InIce or in convex hull (if provided): ignore
neutrinos: ignore
taus and muons: ignore
--> energy losses and decay products are collected
--> ionisation energy losses are disregarded
--> low energy muons created in cascades are disregarded
electron, hadrons, ...: collect EM equivalent energy
Note: the InIce volume is rather large. To provide additional and
more stringent defintions of the detector volume, a convex hull, an
extended IceCube boundary, or a simple cut on the radius can be applied.
In this case, the InIce check will be performed in addition to:
If convex_hull is not None: check if particle is in convex hull
If extend_boundary is not None: check if particle is in extended
IceCube boundary.
If cylinder_ext is not None: check if particle is within the extended
cylinder (z +- 500 + ext, r=500 + ext)
Parameters
----------
frame : I3Frame
Current I3Frame.
convex_hull : scipy.spatial.ConvexHull or None, optional
Defines the desired convex volume to check whether an energy deposit
was inside the detector volume.
extend_boundary : float or None, optional
Use a convex hull around the IceCube detector and extend it by this
distance [in meters] to check if an energy deposit was in the detector
cylinder_ext : float or None, optional
If provided, energy losses with a radius in x-y > 500 + cylinder_ext
and abs(z) > 500 + cylinder_ext will be discarded.
Returns
-------
double
The deposited energy.
"""
deposited_energy = 0.
for p in frame["I3MCTree"]:
# skip dark particles
if p.shape == dataclasses.I3Particle.ParticleShape.Dark:
continue
# skip neutrino: the energy is not visible
if p.is_neutrino:
continue
# skip muons and taus:
# --> energy losses and decay products are still collected
# --> ionisation energy losses are disregarded
# --> low energy muons created in cascades are disregarded
if p.type in [
dataclasses.I3Particle.ParticleType.MuPlus,
dataclasses.I3Particle.ParticleType.MuMinus,
dataclasses.I3Particle.ParticleType.TauMinus,
dataclasses.I3Particle.ParticleType.TauPlus
]:
continue
# Check if the energy deposit was inside the detector.
# Ignore it, if it was outside.
if p.location_type != dataclasses.I3Particle.LocationType.InIce:
# skip particles that are way outside of the detector volume
continue
# use a basic cylinder to determine if particle was inside
if cylinder_ext is not None:
if (np.abs(p.pos.z) > 500 + cylinder_ext
or np.sqrt(p.pos.x**2 + p.pos.y**2) > 500 + cylinder_ext):
continue
if convex_hull is not None:
# use convex hull to determine if inside detector
if not geometry.point_is_inside(convex_hull,
(p.pos.x, p.pos.y, p.pos.z)):
continue
if extend_boundary is not None:
# use IceCube boundary + extent_boundary [meters] to check
if not geometry.is_in_detector_bounds(
p.pos, extend_boundary=extend_boundary):
continue
# scale energy of cascades to EM equivalent
deposited_energy += convert_to_em_equivalent(p)
return deposited_energy
def get_cascade_of_primary_nu(frame, primary,
convex_hull=None,
extend_boundary=200,
sanity_check=False):
"""Get cascade of a primary particle.
The I3MCTree is traversed to find the first interaction inside the convex
hull.
Parameters
----------
frame : I3Frame
Current I3Frame needed to retrieve I3MCTree
primary : I3Particle
Primary Nu Particle for which the cascade interaction is returned.
convex_hull : scipy.spatial.ConvexHull, optional
Defines the desired convex volume.
If None, the IceCube detector volume is assumed.
extend_boundary : float, optional
Extend boundary of IceCube detector by this distance [in meters].
This option is only used if convex_hull is None, e.g. if the IceCube
detector is used.
sanity_check : bool, optional
If true, the neutrino is obtained by two different methods and cross
checked to see if results match.
Returns
-------
I3Particle, None
Returns None if no cascade interaction exists inside the convex hull
Returns the found cascade as an I3Particle.
The returned I3Particle will have the vertex, direction and total
visible energy (EM equivalent) of the cascade. In addition it will
have the type of the interaction NEUTRINO. The visible energy is
defined here as the sum of the EM equivalent energies of the daugther
particles, unless these are neutrinos. Only energies of particles
that have 'InIce' location_type are considered. This meas that
energies from hadron daughter particles get converted to the EM
equivalent energy.
(Does not account for energy carried away by neutrinos of tau decay)
float
The total EM equivalent energy of the EM cascade.
float
The total EM equivalent energy of the hadronic cascade.
float
The total EM equivalent energy in muons and taus (tracks).
"""
neutrino = get_interaction_neutrino(frame, primary,
convex_hull=convex_hull,
extend_boundary=extend_boundary,
sanity_check=sanity_check)
if neutrino is None or not neutrino.is_neutrino:
return None, None, None, None
mctree = frame['I3MCTree']
# traverse I3MCTree until first interaction inside the convex hull is found
daughters = mctree.get_daughters(neutrino)
# -----------------------
# Sanity Checks
# -----------------------
assert len(daughters) > 0, 'Expected at least one daughter!'
# check if point is inside
if convex_hull is None:
point_inside = geometry.is_in_detector_bounds(
daughters[0].pos, extend_boundary=extend_boundary)
else:
point_inside = geometry.point_is_inside(convex_hull,
(daughters[0].pos.x,
daughters[0].pos.y,
daughters[0].pos.z))
assert point_inside, 'Expected interaction to be inside defined volume!'
# -----------------------
# interaction is inside the convex hull/extension boundary: cascade found!
# get cascade
cascade = dataclasses.I3Particle(neutrino)
cascade.shape = dataclasses.I3Particle.ParticleShape.Cascade
cascade.dir = dataclasses.I3Direction(primary.dir)
cascade.pos = dataclasses.I3Position(daughters[0].pos)
cascade.time = daughters[0].time
cascade.length = get_interaction_extension_length(frame, neutrino)
# sum up energies for daughters if not neutrinos
# tau can immediately decay in neutrinos which carry away energy
# that would not be visible, this is currently not accounted for
e_total, e_em, e_hadron, e_track = get_cascade_em_equivalent(
mctree, neutrino)
cascade.energy = e_total
return cascade, e_em, e_hadron, e_track
def get_track_energy_depositions(mc_tree,
track,
num_to_remove,
correct_for_em_loss=True,
energy_threshold=1.,
extend_boundary=None):
"""Get a list of track energy updates and a number of highest energy
cascades that were removed from the track.
Note: this function has a lot of additional code and asserts to verify
that the assumptions made hold. The I3MCTree is not well specified and
may change between software revisions. In this case, the asserts will help
in letting this crash loudly.
The main driving assumption is that the corresponding track update particle
has a minor particle ID +1 from the stochastic loss. This is checked via
asserts on the delta time and position.
Parameters
----------
mc_tree : I3MCTree
The I3MCTree.
track : I3Particle.
The track particle (usually a muon or tau) for which to create
the energy loss plots
num_to_remove : int
Number of energy losses to remove. The n highest energy depositions
will be removed from the track energy losses and instead be handled
as separate cascades.
correct_for_em_loss : bool, optional
If True, energy depositions will be in terms of EM equivalent deposited
energy.
If False, the actual (but possibly invisible) energy depositions is
used..
energy_threshold : float, optional
The energy threshold under which an energy loss is considered to be
removed from the track.
extend_boundary : float, optional
If provided only energy losses within convex hull + extend boundary
are accepted and considered.
Raises
------
NotImplementedError
Description
Returns
-------
dict
update_distances : array_like
The distances for the energy updates wrt the muon vertex.
update_energies : array_like
The energies for at the energy update positions.
cascades : list of I3Particle
List of removed cascades. This list is sorted from highest to lowest
energies.
Note this list may be smaller than `num_to_remove` if the number of
energy losses of the muon are smaller than this number.
track_updates : List of I3Particle
List of track updates.
relative_energy_losses : array_like
The relative energy loss (momentum transfer q) of each cascade
energy deposition. Same length as `cascades`
"""
# sanity check
assert num_to_remove >= 0
# Other tracks such at taus might require additional handling of edge
# cases. Remove for now
if track.type not in [
dataclasses.I3Particle.MuMinus, dataclasses.I3Particle.MuPlus
]:
raise NotImplementedError('Particle type {} not yet supported'.format(
track.type))
# get all daughters of track
daughters = mc_tree.get_daughters(track)
# gather all track updates
# (these define rest track energy at a certain point)
update_distances = []
update_times = []
update_energies = []
update_ids = []
track_updates = []
stoch_daughters = []
stoch_energies = []
last_update_outside = None
track_entered_volume = False
for index, daughter in enumerate(daughters):
# check if these points are inside defined volume
if extend_boundary is not None:
# due to slight deviations in particle positions of the
# corresponding track updates for each stochastic loss it
# can happen that the track update is just outside the
# defined volume while the stochastic loss is just inside.
# We want to avoid this and make sure that the track update
# is always inside (it does not hurt much if only the
# stochastic loss falls outside)
if daughter.type == track.type:
eps_boundary = 0.1
else:
eps_boundary = 0.
# use IceCube boundary + extent_boundary [meters] to check
if not geometry.is_in_detector_bounds(
daughter.pos,
extend_boundary=extend_boundary + eps_boundary):
if daughter.type == track.type:
if not track_entered_volume:
last_update_outside = daughter
continue
track_entered_volume = True
if daughter.type == track.type:
# this is probably a track segment updated
update_distances.append((daughter.pos - track.pos).magnitude)
update_energies.append(daughter.energy)
update_times.append(daughter.time)
update_ids.append(daughter.id.minorID)
track_updates.append(daughter)
else:
stoch_daughters.append(daughter)
stoch_energies.append(daughter.energy)
update_distances = np.array(update_distances)
update_energies = np.array(update_energies)
update_times = np.array(update_times)
update_ids = np.array(update_ids)
# check that everything is sorted
assert (np.diff(update_distances) >= 0).all()
assert (np.diff(update_times) >= 0).all()
assert (np.diff(update_ids) > 0).all()
# find the n highest energy depositions and remove these
indices = np.argsort(stoch_energies)
sorted_stoch_daughters = [stoch_daughters[i] for i in indices]
num_removed = min(
num_to_remove,
len([d for d in stoch_daughters if d.energy > energy_threshold]))
if num_removed == 0:
cascades = []
cascades_left = sorted_stoch_daughters
elif num_removed == len(sorted_stoch_daughters):
cascades = sorted_stoch_daughters[::-1]
cascades_left = []
else:
cascades_left = sorted_stoch_daughters[:-num_removed]
cascades = sorted_stoch_daughters[-num_removed:][::-1]
assert len(cascades) == num_removed
# keep track of returned energy
returned_energy = 0
# keep track of unaccounted daughters, e.g. energy losses that do not have
# a matching track update. This should only happen for the decay point
unaccounted_daughters = []
# compute relative energy loss (momentum transfer q) of each cascade
relative_energy_losses = []
if len(update_distances) > 0:
# values for sanity check
previous_energy = float(update_energies[-1])
# fix the track updates by adding back the energy from the
# removed cascades
for cascade in cascades:
# find the track update at the point of the stochastic loss
index = get_update_index(update_times, update_energies, update_ids,
cascade)
# the index should only be None if this cascade is part of the
# decay products, e.g. at the end of the track
if index is None and np.allclose(
cascade.time, daughters[-1].time, atol=1e-2):
unaccounted_daughters.append((cascade, True))
# we would need to consider the continous losses to estimate
# the relative energy loss. Instead of doing this, we'll just
# add a NaN for now.
relative_energy_losses.append(float('nan'))
else:
assert index is not None
assert np.allclose(update_times[index],
cascade.time,
atol=1e-2)
assert np.allclose(update_distances[index],
(cascade.pos - track.pos).magnitude,
atol=1e-1)
# the energy of the muon update is already reduced by the loss.
# To obtain the muon energy prior to the loss, we need to add
# it back
relative_energy_losses.append(
cascade.energy /
(cascade.energy + track_updates[index].energy))
# update all of the remaining track updates
# (add energy back since we assume this did not get depsosited)
update_energies[index:] += cascade.energy
# keep track of returned energy
returned_energy += cascade.energy
# sanity checks
assert np.allclose(update_energies[-1] - returned_energy,
previous_energy)
assert (np.diff(update_energies) <= 1e-4).all()
else:
# No track updates exist. We would need to consider the continous
# losses to estimate the relative energy loss. Instead of doing this,
# we'll just add NaNs for now.
for cascade in cascades:
relative_energy_losses.append(float('nan'))
relative_energy_losses = np.array(relative_energy_losses)
assert len(relative_energy_losses) == len(cascades)
# Now walk through the leftover stochastic energy losses and make sure
# that they are all covered by the track updates, possibly correct
# for EM equivalent light yield if `correct_for_em_loss` is set to True.
for daughter in cascades_left:
# distance to stochastic energy loss
distance = (daughter.pos - track.pos).magnitude
# find the track update at the point of the stochastic loss
index = get_update_index(update_times, update_energies, update_ids,
daughter)
if index is not None:
# perform some sanity checks
assert np.allclose(update_times[index], daughter.time, atol=1e-2)
assert np.allclose(
update_distances[index],
(daughter.pos - track.pos).magnitude,
atol=0.1,
)
# sanity check to see if energy loss is included
if index == 0:
if last_update_outside is None:
# Sometimes there are no muons inserted previous to
# the first stochastic energy loss.
# use the track energy in this case
previous_energy = track.energy
else:
previous_energy = last_update_outside.energy
else:
previous_energy = update_energies[index - 1]
delta_energy = previous_energy - update_energies[index]
assert delta_energy >= daughter.energy - 1e-3
if correct_for_em_loss:
em_energy = convert_to_em_equivalent(daughter)
delta_energy = daughter.energy - em_energy
assert delta_energy > -1e-7
delta_energy = np.clip(delta_energy, 0., np.inf)
# need to update additional delta_energy form
# update all of the remaining track updates
# (add energy back since we assume this did not get depsosited)
update_energies[index:] += delta_energy
# keep track of returned energy
returned_energy += delta_energy
else:
# This seems to be an unaccounted stochastic energy loss
# These should only be at end of track when muon decays
# or in some unlucky cases in which the track update happens
# to get cut away, while the stochastic energy is still inside.
# However, we account for the latter case by increasing the
# convex hull when checking for contained track updates.
assert np.allclose(daughter.time, daughters[-1].time, atol=1e-2)
unaccounted_daughters.append((daughter, False))
# If there are unnaccounted stochastic energy losses, make sure these
# are the particle decay
if len(unaccounted_daughters) > 0:
assert len(unaccounted_daughters) == 3
assert unaccounted_daughters[0][0].pos == \
unaccounted_daughters[1][0].pos
assert unaccounted_daughters[0][0].pos == \
unaccounted_daughters[2][0].pos
# add an update distance with the rest of the deposited energy
if len(update_energies) == 0:
# this should only be the case if the only energy losses in the
# I3MCTree are the ones from the decay
assert len(stoch_daughters) == 3
previous_energy = track.energy
else:
previous_energy = update_energies[-1]
energy_dep = previous_energy - returned_energy
# subtract off energy carried away by neutrinos or not visible
for daughter, is_accounted_for in unaccounted_daughters:
if daughter.type in [
dataclasses.I3Particle.NuE,
dataclasses.I3Particle.NuMu,
dataclasses.I3Particle.NuTau,
dataclasses.I3Particle.NuEBar,
dataclasses.I3Particle.NuMuBar,
dataclasses.I3Particle.NuTauBar,
] or is_accounted_for:
energy_dep -= daughter.energy
elif correct_for_em_loss:
em_energy = convert_to_em_equivalent(daughter)
delta_energy = daughter.energy - em_energy
energy_dep -= delta_energy
assert energy_dep <= previous_energy
update_distances = np.append(
update_distances,
(track.pos - unaccounted_daughters[0][0].pos).magnitude)
update_energies = np.append(update_energies,
previous_energy - energy_dep)
# If there is only one track update in the detector, prepend the last one
# before the detector
if len(update_distances) == 1:
# add last existing track update if it exists
if last_update_outside is not None:
distance = (track.pos - last_update_outside.pos).magnitude
energy = last_update_outside.energy
update_distances = np.insert(update_distances, 0, distance)
update_energies = np.insert(update_energies, 0, energy)
track_updates = [last_update_outside] + track_updates
# otherwise add the starting track position and energy
else:
update_distances = np.insert(update_distances, 0, 0.)
update_energies = np.insert(update_energies, 0, track.energy)
track_updates = [track] + track_updates
# energies should be monotonously decreasing except if updates are
# extremely close to each other
assert (np.diff(update_distances)[np.diff(update_energies) >= 0] <
1e-1).all()
# Fix monoticity of energy updates that might have gotten broken due
# to numerical issues
energy_corrections = np.diff(update_energies)
mask = energy_corrections <= 0.
energy_corrections[mask] = 0.
assert (np.abs(energy_corrections) <= 1e-2).all()
update_energies[1:] -= energy_corrections
assert (np.diff(update_energies) <= 0).all()
assert (np.all(update_energies) >= 0)
assert (np.diff([c.energy for c in cascades]) < 0).all()
return {
'update_distances': update_distances,
'update_energies': update_energies,
'cascades': cascades,
'track_updates': track_updates,
'relative_energy_losses': relative_energy_losses,
}
def __call__(self, bias_data):
"""Apply Bias Function
Parameters
----------
bias_data : dict
Dictionary of bias input data.
Contents may include:
{
'frame': the current I3Frame,
}
Returns
-------
float
Keep probability: probability with which this event should be kept.
"""
frame = bias_data['frame']
# get primary
mc_tree = frame[self.mctree_name]
primaries = mc_tree.get_primaries()
assert len(primaries) == 1, 'Expected only 1 Primary!'
# get muon
muon = mu_utils.get_muon(
frame,
primaries[0],
detector.icecube_hull,
mctree_name=self.mctree_name,
)
if muon is None:
# if muon did not hit the convex hull, or if no muon exists,
# it will be None. In this case we set default values
found_muon = False
cos_zen = np.cos(primaries[0].dir.zenith)
track_length = 0.
max_rel_loss = 0.
else:
found_muon = True
cos_zen = np.cos(muon.dir.zenith)
track_length = mu_utils.get_muon_track_length_inside(
muon, detector.icecube_hull)
# get muon energy losses
losses = [
loss for loss in mc_tree.get_daughters(muon)
if not mu_utils.is_muon(loss) and
geometry.is_in_detector_bounds(loss.pos, extend_boundary=60)
]
# compute relative energy losses
rel_losses = []
loss_energies = []
for loss in losses:
# get energy of muon prior to energy loss
distance = (muon.pos - loss.pos).magnitude
energy = mu_utils.get_muon_energy_at_distance(
frame, muon, np.clip(distance - 1, 0., float('inf')))
# If the loss is at the muon decay point, the returned energy
# might be NaN, assert this and set default value of 1 GeV
if not np.isfinite(energy):
assert np.abs(distance - muon.length) < 1, (energy, muon)
energy = 1
rel_loss = loss.energy / energy
if rel_loss > 1. or rel_loss < 0.:
msg = 'Found out of bounds rel_loss: {:3.3f}. '.format(
rel_loss)
msg += 'Clipping value to [0, 1]'
log_warn(msg)
rel_loss = np.clip(rel_loss, 0., 1.)
loss_energies.append(loss.energy)
rel_losses.append(rel_loss)
if rel_losses:
max_rel_loss = rel_losses[np.argmax(loss_energies)]
else:
max_rel_loss = 0.
# bias based on zenith
if self.cos_zenith_sigmoid_scale is None:
zenith_keep_prob = 1.0
else:
zenith_keep_prob = self.sigmoid(
-cos_zen,
s=self.cos_zenith_sigmoid_scale,
b=self.cos_zenith_sigmoid_bias,
)
# bias based on in detector track length
if self.track_length_sigmoid_scale is None:
track_length_prob = 1.0
else:
track_length_prob = self.sigmoid(
track_length,
s=self.track_length_sigmoid_scale,
b=self.track_length_sigmoid_bias,
)
# bias based on maximum relative energy loss
if self.muon_loss_sigmoid_scale is None:
max_rel_loss_prob = 1.
else:
max_rel_loss_prob = self.sigmoid(
max_rel_loss,
s=self.muon_loss_sigmoid_scale,
b=self.muon_loss_sigmoid_bias,
)
bias_info = {
'found_muon': found_muon,
'cos_zenith': cos_zen,
'track_length_in_detector': track_length,
'max_relative_energy_loss': max_rel_loss,
}
keep_prob = zenith_keep_prob * track_length_prob * max_rel_loss_prob
return keep_prob, bias_info