Improvements for inelasticity reconstructions and other utilities

src/graphnet/data/constants.py

@@ -50,6 +50,8 @@ class TRUTH:
         "interaction_type",
         "interaction_time",  # Added for vertex reconstruction
         "inelasticity",
+        "visible_inelasticity",
+        "visible_energy",
         "stopped_muon",
     ]
     DEEPCORE = ICECUBE86

src/graphnet/data/extractors/icecube/i3truthextractor.py

@@ -2,6 +2,7 @@
 
 import numpy as np
 import matplotlib.path as mpath
+from scipy.spatial import ConvexHull, Delaunay
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
 
 from .i3extractor import I3Extractor
@@ -12,10 +13,12 @@
 from graphnet.utilities.imports import has_icecube_package
 
 if has_icecube_package() or TYPE_CHECKING:
-    from icecube import (
+    from icecube import (  # noqa: F401
         dataclasses,
         icetray,
         phys_services,
+        dataio,
+        LeptonInjector,
     )  # pyright: reportMissingImports=false
 
 
@@ -27,6 +30,7 @@ def __init__(
         name: str = "truth",
         borders: Optional[List[np.ndarray]] = None,
         mctree: Optional[str] = "I3MCTree",
+        extend_boundary: Optional[float] = 0.0,
     ):
         """Construct I3TruthExtractor.
 
@@ -37,6 +41,8 @@ def __init__(
                 stopping within the detector. Defaults to hard-coded boundary
                 coordinates.
             mctree: Str of which MCTree to use for truth values.
+            extend_boundary: Distance to extend the convex hull of the detector
+                for defining starting events.
         """
         # Base class constructor
         super().__init__(name)
@@ -78,15 +84,53 @@ def __init__(
             self._borders = [border_xy, border_z]
         else:
             self._borders = borders
+
+        self._extend_boundary = extend_boundary
         self._mctree = mctree
 
+    def set_gcd(self, i3_file: str, gcd_file: Optional[str] = None) -> None:
+        """Extract GFrame and CFrame from i3/gcd-file pair.
+
+           Information from these frames will be set as member variables of
+           `I3Extractor.`
+
+        Args:
+            i3_file: Path to i3 file that is being converted.
+            gcd_file: Path to GCD file. Defaults to None. If no GCD file is
+                      given, the method will attempt to find C and G frames in
+                      the i3 file instead. If either one of those are not
+                      present, `RuntimeErrors` will be raised.
+        """
+        super().set_gcd(i3_file=i3_file, gcd_file=gcd_file)
+
+        # Modifications specific to I3TruthExtractor
+        # These modifications are needed to identify starting events
+        coordinates = []
+        for _, g in self._gcd_dict.items():
+            if g.position.z > 1200:
+                continue  # We want to exclude icetop
+            coordinates.append([g.position.x, g.position.y, g.position.z])
+        coordinates = np.array(coordinates)
+
+        if self._extend_boundary != 0.0:
+            center = np.mean(coordinates, axis=0)
+            d = coordinates - center
+            norms = np.linalg.norm(d, axis=1, keepdims=True)
+            dn = d / norms
+            coordinates = coordinates + dn * self._extend_boundary
+
+        hull = ConvexHull(coordinates)
+
+        self.hull = hull
+        self.delaunay = Delaunay(coordinates[self.hull.vertices])
+
     def __call__(
         self, frame: "icetray.I3Frame", padding_value: Any = -1
     ) -> Dict[str, Any]:
         """Extract truth-level information."""
         is_mc = frame_is_montecarlo(frame, self._mctree)
         is_noise = frame_is_noise(frame, self._mctree)
-        sim_type = self._find_data_type(is_mc, self._i3_file)
+        sim_type = self._find_data_type(is_mc, self._i3_file, frame)
 
         output = {
             "energy": padding_value,
@@ -119,6 +163,7 @@ def __call__(
             "L5_oscNext_bool": padding_value,
             "L6_oscNext_bool": padding_value,
             "L7_oscNext_bool": padding_value,
+            "is_starting": padding_value,
         }
 
         # Only InIceSplit P frames contain ML appropriate
@@ -230,6 +275,13 @@ def __call__(
                     }
                 )
 
+            is_starting = self._contained_vertex(output)
+            output.update(
+                {
+                    "is_starting": is_starting,
+                }
+            )
+
         return output
 
     def _extract_dbang_decay_length(
@@ -374,15 +426,34 @@ def _get_primary_particle_interaction_type_and_elasticity(
                 # all variables and has no nans (always muon)
         else:
             MCInIcePrimary = None
-        try:
-            interaction_type = frame["I3MCWeightDict"]["InteractionType"]
-        except KeyError:
-            interaction_type = padding_value
 
-        try:
-            elasticity = frame["I3GENIEResultDict"]["y"]
-        except KeyError:
-            elasticity = padding_value
+        if sim_type == "LeptonInjector":
+            event_properties = frame["EventProperties"]
+            final_state_1 = event_properties.finalType1
+            if final_state_1 in [
+                dataclasses.I3Particle.NuE,
+                dataclasses.I3Particle.NuMu,
+                dataclasses.I3Particle.NuTau,
+                dataclasses.I3Particle.NuEBar,
+                dataclasses.I3Particle.NuMuBar,
+                dataclasses.I3Particle.NuTauBar,
+            ]:
+                interaction_type = 2  # NC
+            else:
+                interaction_type = 1  # CC
+
+            elasticity = 1 - event_properties.finalStateY
+
+        else:
+            try:
+                interaction_type = frame["I3MCWeightDict"]["InteractionType"]
+            except KeyError:
+                interaction_type = int(padding_value)
+
+            try:
+                elasticity = 1 - frame["I3MCWeightDict"]["BjorkenY"]
+            except KeyError:
+                elasticity = padding_value
 
         return MCInIcePrimary, interaction_type, elasticity
 
@@ -418,12 +489,15 @@ def _get_primary_track_energy_and_inelasticity(
         return energy_track, energy_cascade, inelasticity
 
     # Utility methods
-    def _find_data_type(self, mc: bool, input_file: str) -> str:
+    def _find_data_type(
+        self, mc: bool, input_file: str, frame: "icetray.I3Frame"
+    ) -> str:
         """Determine the data type.
 
         Args:
             mc: Whether `input_file` is Monte Carlo simulation.
             input_file: Path to I3-file.
+            frame: Physics frame containing MC record
 
         Returns:
             The simulation/data type.
@@ -439,8 +513,26 @@ def _find_data_type(self, mc: bool, input_file: str) -> str:
             sim_type = "genie"
         elif "noise" in input_file:
             sim_type = "noise"
-        elif "L2" in input_file:  # not robust
-            sim_type = "dbang"
-        else:
+        elif frame.Has("EventProprties") or frame.Has(
+            "LeptonInjectorProperties"
+        ):
+            sim_type = "LeptonInjector"
+        elif frame.Has("I3MCWeightDict"):
             sim_type = "NuGen"
+        else:
+            raise NotImplementedError("Could not determine data type.")
         return sim_type
+
+    def _contained_vertex(self, truth: Dict[str, Any]) -> bool:
+        """Determine if an event is starting based on vertex position.
+
+        Args:
+            truth: Dictionary of already extracted truth-level information.
+
+        Returns:
+            True/False if vertex is inside detector.
+        """
+        vertex = np.array(
+            [truth["position_x"], truth["position_y"], truth["position_z"]]
+        )
+        return self.delaunay.find_simplex(vertex) >= 0

src/graphnet/data/extractors/icecube/utilities/i3_filters.py

@@ -64,6 +64,30 @@ def _keep_frame(self, frame: "icetray.I3Frame") -> bool:
         return True
 
 
+class SubEventStreamI3Filter(I3Filter):
+    """A filter that only keeps frames from select splits."""
+
+    def __init__(self, selection: List[str]):
+        """Initialize SubEventStreamI3Filter.
+
+        Args:
+            selection: List of subevent streams to keep.
+        """
+        self._selection = selection
+
+    def _keep_frame(self, frame: "icetray.I3Frame") -> bool:
+        """Check if current frame should be kept.
+
+        Args:
+            frame: I3-frame
+                The I3-frame to check.
+        """
+        if frame.Has("I3EventHeader"):
+            if frame["I3EventHeader"].sub_event_stream not in self._selection:
+                return False
+        return True
+
+
 class I3FilterMask(I3Filter):
     """Checks list of filters from the FilterMask in I3 frames."""
 

src/graphnet/models/graphs/nodes/nodes.py

@@ -326,6 +326,7 @@ def __init__(
             "z_offset": None,
             "z_scaling": None,
         },
+        sample_pulses: bool = True,
     ) -> None:
         """Construct `IceMixNodes`.
 
@@ -339,6 +340,9 @@ def __init__(
             ice in IceCube are added to the feature set based on z coordinate.
             ice_args: Offset and scaling of the z coordinate in the Detector,
             to be able to make similar conversion in the ice data.
+            sample_pulses: Enable sampling random pulses. If True and the
+            event is longer than the max_length, they will be sampled. If
+            False, then only the first max_length pulses will be selected.
         """
         if input_feature_names is None:
             input_feature_names = [
@@ -384,6 +388,7 @@ def __init__(
         self.z_name = z_name
         self.hlc_name = hlc_name
         self.add_ice_properties = add_ice_properties
+        self.sampling_enabled = sample_pulses
 
     def _define_output_feature_names(
         self, input_feature_names: List[str]
@@ -437,7 +442,14 @@ def _construct_nodes(self, x: torch.Tensor) -> Tuple[Data, List[str]]:
             x[:, self.feature_indexes[self.hlc_name]] = torch.logical_not(
                 x[:, self.feature_indexes[self.hlc_name]]
             )  # hlc in kaggle was flipped
-        ids = self._pulse_sampler(x, event_length)
+        if self.sampling_enabled:
+            ids = self._pulse_sampler(x, event_length)
+        else:
+            if event_length < self.max_length:
+                ids = torch.arange(event_length)
+            else:
+                ids = torch.arange(self.max_length)
+
         event_length = min(self.max_length, event_length)
 
         graph = torch.zeros([event_length, self.n_features])

src/graphnet/models/task/reconstruction.py

@@ -232,3 +232,19 @@ class InelasticityReconstruction(StandardLearnedTask):
     def _forward(self, x: Tensor) -> Tensor:
         # Transform output to unit range
         return torch.sigmoid(x)
+
+
+class VisibleInelasticityReconstruction(StandardLearnedTask):
+    """Reconstructs interaction visible inelasticity.
+
+    That is, 1-(visible track energy / visible hadronic energy).
+    """
+
+    # Requires one features: inelasticity itself
+    default_target_labels = ["visible_inelasticity"]
+    default_prediction_labels = ["visible_inelasticity_pred"]
+    nb_inputs = 1
+
+    def _forward(self, x: Tensor) -> Tensor:
+        # Transform output to unit range
+        return 0.5 * (torch.tanh(2.0 * x) + 1.0)

src/graphnet/training/loss_functions.py

@@ -63,6 +63,14 @@ def _forward(self, prediction: Tensor, target: Tensor) -> Tensor:
         """Syntax like `.forward`, for implentation in inheriting classes."""
 
 
+class MAELoss(LossFunction):
+    """Mean absolute error loss."""
+
+    def _forward(self, prediction: Tensor, target: Tensor) -> Tensor:
+        """Implement loss calculation."""
+        return torch.mean(torch.abs(prediction - target), dim=-1)
+
+
 class MSELoss(LossFunction):
     """Mean squared error loss."""