cavis/libnd4j/include/ops/declarable/PlatformHelper.h

/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

//
// @author raver119@gmail.com
//

#ifndef SD_PLATFORMHELPER_H
#define SD_PLATFORMHELPER_H

#include <helpers/ShapeUtils.h>
#include <execution/Engine.h>
#include <graph/Context.h>
#include <string>
#include <system/pointercast.h>
#include <system/dll.h>

namespace sd {
    namespace ops {
        namespace platforms {
            /**
             * This abstract class defines methods used by platform-specific helpers implementations
             */
            class ND4J_EXPORT PlatformHelper {
            protected:
                // target engine for this impl
                samediff::Engine _engine;

                // name of the operation this helper is built for
                std::string _name;

                // hash of the operation this helper is built for
                Nd4jLong _hash;
            public:
                PlatformHelper(const char *name, samediff::Engine engine);

                ~PlatformHelper() = default;

                std::string name();

                samediff::Engine engine();

                Nd4jLong hash();

                /**
                 * This method checks, if given helper can be used with given input/output/configuration options
                 *
                 * @param context
                 * @return
                 */
                virtual bool isUsable(graph::Context &context) = 0;

                /**
                 * This method invokes helper. Typically this method replaces actual op execution
                 *
                 * @param context
                 * @return
                 */
                virtual Nd4jStatus invokeHelper(graph::Context &context) = 0;

                /**
                 * Helper method, needed for compatibility with DeclarableOp macros
                 * @param ctx
                 * @param inputId
                 * @return
                 */
                sd::NDArray* getZ(graph::Context &ctx, int inputId);

                /**
                 * Helper method, needed for compatibility with DeclarableOp macros
                 * @param ctx
                 * @param inputId
                 * @return
                 */
                sd::NDArray* getNullifiedZ(graph::Context &ctx, int inputId);
            };
        }
    }
}


#endif //SD_PLATFORMHELPER_H