// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#pragma once

#include <vector>

#include "ErrorModel.h"

// FitErrorModel (ErrorModel.h) on the GPU. The bins hold the same samples, every normalised deviation
// and so every bin median is the host's to the bit, and the update step is the host's own
// (ErrorModelUpdate). What differs is the order each bin's two sums are added in - a fixed tree here,
// the order nth_element left the bin in on the host - so a and b^2 can differ from the host fit in
// their last bits. Deterministic: the same pool gives the same fit on every run. Only built with CUDA;
// a device without room for about 72 bytes a sample throws (run on the CPU build then).
ErrorModelFit FitErrorModelGPU(const std::vector<ErrorModelSample> &pool);