com.simiacryptus.mindseye.layers.java.ImgBandSelectLayer.java Source code

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Here is the source code for com.simiacryptus.mindseye.layers.java.ImgBandSelectLayer.java

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/*
 * Copyright (c) 2018 by Andrew Charneski.
 *
 * The author licenses this file to you under the
 * Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance
 * with the License.  You may obtain a copy
 * of the License at
 *
 *   http://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.
 */

package com.simiacryptus.mindseye.layers.java;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.simiacryptus.mindseye.lang.*;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.*;
import java.util.stream.IntStream;

/**
 * Selects specific color bands from the input, producing an png apply the same resolution but fewer bands.
 */
@SuppressWarnings("serial")
public class ImgBandSelectLayer extends LayerBase {

    private final int[] bands;

    /**
     * Instantiates a new Img band select key.
     *
     * @param bands the bands
     */
    public ImgBandSelectLayer(final int... bands) {
        super();
        this.bands = bands;
    }

    /**
     * Instantiates a new Img band select key.
     *
     * @param json the json
     */
    protected ImgBandSelectLayer(@Nonnull final JsonObject json) {
        super(json);
        final JsonArray jsonArray = json.getAsJsonArray("bands");
        bands = new int[jsonArray.size()];
        for (int i = 0; i < bands.length; i++) {
            bands[i] = jsonArray.get(i).getAsInt();
        }
    }

    /**
     * From json img band select key.
     *
     * @param json the json
     * @param rs   the rs
     * @return the img band select key
     */
    public static ImgBandSelectLayer fromJson(@Nonnull final JsonObject json, Map<CharSequence, byte[]> rs) {
        return new ImgBandSelectLayer(json);
    }

    @Nonnull
    @Override
    public Result eval(@Nonnull final Result... inObj) {
        final Result input = inObj[0];
        final TensorList batch = input.getData();
        @Nonnull
        final int[] inputDims = batch.getDimensions();
        assert 3 == inputDims.length;
        @Nonnull
        final Tensor outputDims = new Tensor(inputDims[0], inputDims[1], bands.length);
        Arrays.stream(inObj).forEach(nnResult -> nnResult.addRef());
        @Nonnull
        TensorArray wrap = TensorArray.wrap(
                IntStream.range(0, batch.length()).parallel().mapToObj(dataIndex -> outputDims.mapCoords((c) -> {
                    int[] coords = c.getCoords();
                    @Nullable
                    Tensor tensor = batch.get(dataIndex);
                    double v = tensor.get(coords[0], coords[1], bands[coords[2]]);
                    tensor.freeRef();
                    return v;
                })).toArray(i -> new Tensor[i]));
        outputDims.freeRef();
        return new Result(wrap, (@Nonnull final DeltaSet<UUID> buffer, @Nonnull final TensorList error) -> {
            if (input.isAlive()) {
                @Nonnull
                TensorArray tensorArray = TensorArray
                        .wrap(IntStream.range(0, error.length()).parallel().mapToObj(dataIndex -> {
                            @Nonnull
                            final Tensor passback = new Tensor(inputDims);
                            @Nullable
                            final Tensor err = error.get(dataIndex);
                            err.coordStream(false).forEach(c -> {
                                int[] coords = c.getCoords();
                                passback.set(coords[0], coords[1], bands[coords[2]], err.get(c));
                            });
                            err.freeRef();
                            return passback;
                        }).toArray(i -> new Tensor[i]));
                input.accumulate(buffer, tensorArray);
            }
        }) {

            @Override
            protected void _free() {
                Arrays.stream(inObj).forEach(nnResult -> nnResult.freeRef());
            }

            @Override
            public boolean isAlive() {
                return input.isAlive() || !isFrozen();
            }
        };
    }

    @Nonnull
    @Override
    public JsonObject getJson(Map<CharSequence, byte[]> resources, DataSerializer dataSerializer) {
        @Nonnull
        final JsonObject json = super.getJsonStub();
        @Nonnull
        final JsonArray array = new JsonArray();
        for (final int b : bands) {
            array.add(new JsonPrimitive(b));
        }
        json.add("bands", array);
        return json;
    }

    @Nonnull
    @Override
    public List<double[]> state() {
        return new ArrayList<>();
    }

}