This data set is an output of a simulation of electrons and pions shot at a chunk of an imaging calorimeter. It is used in the case study for GarNet-on-FPGA, documented in arXiv:2008.03601. Each HDF5 file contains the following arrays: Name | Shape | Description cluster | (10000, 128, 4) | Samples for training and inference. Outermost dimension is the event (cluster). Each cluster has maximum 128 hits, each of which has four features: x, y, z, and energy. The coordinates of the hits are in cm. The energy is in GeV. The x and y coordinates are relative to the seed hit, while the z coordinate is with respect to the calorimeter front face. size | (10000) | Number of hits in each cluster. The cluster array is zero-padded when the cluster size is below 128. truth_pid | (10000) | Identity of the primary particle (0: electron, 1: pion). truth_energy | (10000) | True energy of the primary particle. raw | (10000, 4375, 2) | Raw data (actual output of the simulation). For each event (outermost dimension), hit energy and primary fraction (innermost dimension indices 0 and 1) are given for each of the 4375 sensors. Energy is in MeV. coordinates | (4375, 3) | The x, y, and z coordinates of the 4375 sensors, to be used to interpret the raw data. See the paper for the details of the simulation.