Reshape.cpp

/********************************************************************************
 * Copyright (c) 2023 CEA-List
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 ********************************************************************************/

#include <cstddef>    // std::size_t
#include <cstdint>    // std::int64_t
#include <stdexcept>  // std::runtime_error
#include <string>
#include <vector>

#include "aidge/operator/Reshape.hpp"
#include "aidge/utils/ErrorHandling.hpp"
#include "aidge/utils/Types.h"

const std::string Aidge::Reshape_Op::Type = "Reshape";

void Aidge::Reshape_Op::computeOutputDims() {
    // check input has been associated
    if (!getInput(0)) {
        AIDGE_THROW_OR_ABORT(std::runtime_error, "Input was not connected");
    }

    std::vector<DimSize_t> outDims;
    // variables to handle a negative dimension
    bool foundNegativeDimension = false;
    std::size_t outSize = 1;
    DimIdx_t negativeIndex = 0;

    for(std::size_t i = 0; i < this->template getAttr<ReshapeAttr::Shape>().size(); ++i)
    {
        std::int64_t dimSize = this->template getAttr<ReshapeAttr::Shape>()[i];
        if (dimSize < 0) {
            if (foundNegativeDimension) {
                AIDGE_THROW_OR_ABORT(std::runtime_error, "Found more than one negative dimension in Reshape Operator.");
            }
            foundNegativeDimension = true;
            dimSize = 1;
            negativeIndex = static_cast<DimIdx_t>(i);
        }
        outDims.push_back(static_cast<DimSize_t>(dimSize));
        outSize *= static_cast<DimSize_t>(dimSize);
    }

    if (foundNegativeDimension) {
        outDims[negativeIndex] = (getInput(0) -> size()) / outSize;
    }

    mOutputs[0]->resize(outDims);
}