be.iminds.iot.dianne.builder.DianneData.java Source code

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Here is the source code for be.iminds.iot.dianne.builder.DianneData.java

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/*******************************************************************************
 * DIANNE  - Framework for distributed artificial neural networks
 * Copyright (C) 2015  iMinds - IBCN - UGent
 *
 * This file is part of DIANNE.
 *
 * DIANNE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contributors:
 *     Tim Verbelen, Steven Bohez
 *******************************************************************************/
package be.iminds.iot.dianne.builder;

import java.io.IOException;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;

import be.iminds.iot.dianne.api.dataset.Dataset;
import be.iminds.iot.dianne.api.dataset.DatasetDTO;
import be.iminds.iot.dianne.api.dataset.DianneDatasets;
import be.iminds.iot.dianne.api.dataset.Sample;
import be.iminds.iot.dianne.tensor.TensorOps;
import be.iminds.iot.dianne.tensor.util.JsonConverter;

@Component(service = { javax.servlet.Servlet.class }, property = { "alias:String=/dianne/datasets",
        "osgi.http.whiteboard.servlet.pattern=/dianne/datasets", "aiolos.proxy=false" }, immediate = true)
public class DianneData extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private Random rand = new Random(System.currentTimeMillis());
    private JsonConverter converter = new JsonConverter();

    private DianneDatasets datasets;

    @Reference
    void setDianneDatasets(DianneDatasets d) {
        this.datasets = d;
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("application/json");
        String action = request.getParameter("action");

        if (action.equals("available-datasets")) {
            JsonArray result = new JsonArray();
            synchronized (datasets) {
                for (DatasetDTO d : datasets.getDatasets()) {
                    JsonObject r = new JsonObject();
                    r.add("dataset", new JsonPrimitive(d.name));
                    r.add("size", new JsonPrimitive(d.size));
                    if (d.inputType != null)
                        r.add("inputType", new JsonPrimitive(d.inputType));
                    if (d.targetType != null)
                        r.add("targetType", new JsonPrimitive(d.targetType));
                    String[] ll = d.labels;
                    if (ll != null) {
                        JsonArray labels = new JsonArray();
                        for (String l : ll) {
                            labels.add(new JsonPrimitive(l));
                        }
                        r.add("labels", labels);
                    }
                    result.add(r);
                }
            }
            response.getWriter().println(result.toString());
            response.getWriter().flush();
        } else if (action.equals("sample")) {
            String dataset = request.getParameter("dataset");
            Dataset d = datasets.getDataset(dataset);
            if (d != null && d.size() > 0) {
                int index = rand.nextInt(d.size());
                Sample s = d.getSample(index);
                JsonObject sample = converter.toJson(s.input);
                sample.add("index", new JsonPrimitive(index));
                String[] labels = d.getLabels();
                if (labels != null) {
                    sample.add("target", new JsonPrimitive(labels[TensorOps.argmax(s.target)]));
                } else {
                    if (s.target.size() < 10) {
                        JsonObject target = converter.toJson(s.target);
                        sample.add("target", target.get("data").getAsJsonArray());
                    }
                }

                response.getWriter().println(sample.toString());
                response.getWriter().flush();
            }
        }
    }
}