Laden und speichern von Netzen ermöglicht

src/main/java/schule/ngb/zm/ml/NeuralNetwork.java

@@ -1,9 +1,110 @@
 package schule.ngb.zm.ml;
 
 import schule.ngb.zm.util.Log;
+import schule.ngb.zm.util.ResourceStreamProvider;
+
+import java.io.*;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.NoSuchElementException;
 
 public class NeuralNetwork {
 
+	public static void saveToFile( String source, NeuralNetwork network ) {
+		try(
+			Writer writer = ResourceStreamProvider.getWriter(source);
+			PrintWriter out = new PrintWriter(writer)
+		) {
+			for( NeuronLayer layer: network.layers ) {
+				out.print(layer.getNeuronCount());
+				out.print(' ');
+				out.print(layer.getInputCount());
+				out.println();
+
+				for( int i = 0; i < layer.getInputCount(); i++ ) {
+					for( int j = 0; j < layer.getNeuronCount(); j++ ) {
+						out.print(layer.weights.coefficients[i][j]);
+						out.print(' ');
+					}
+					out.println();
+				}
+				for( int j = 0; j < layer.getNeuronCount(); j++ ) {
+					out.print(layer.biases[j]);
+					out.print(' ');
+				}
+				out.println();
+			}
+			out.flush();
+		} catch( IOException ex ) {
+			LOG.warn(ex, "");
+		}
+	}
+
+	public static NeuralNetwork loadFromFile( String source ) {
+		try(
+			Reader reader = ResourceStreamProvider.getReader(source);
+			BufferedReader in = new BufferedReader(reader)
+		) {
+			List<NeuronLayer> layers = new LinkedList<>();
+			String line;
+			while( (line = in.readLine()) != null ) {
+				String[] split = line.split(" ");
+				int neurons = Integer.parseInt(split[0]);
+				int inputs = Integer.parseInt(split[1]);
+
+				NeuronLayer layer = new NeuronLayer(neurons, inputs);
+				for( int i = 0; i < inputs; i++ ) {
+					split = in.readLine().split(" ");
+					for( int j = 0; j < neurons; j++ ) {
+						layer.weights.coefficients[i][j] = Double.parseDouble(split[j]);
+					}
+				}
+				// Load Biases
+				split = in.readLine().split(" ");
+				for( int j = 0; j < neurons; j++ ) {
+					layer.biases[j] = Double.parseDouble(split[j]);
+				}
+
+				layers.add(layer);
+			}
+
+			return new NeuralNetwork(layers);
+		} catch( IOException | NoSuchElementException ex ) {
+			LOG.warn(ex, "Could not load neural network from source <%s>", source);
+		}
+		return null;
+	}
+
+	/*public static NeuralNetwork loadFromFile( String source ) {
+		try(
+			InputStream stream = ResourceStreamProvider.getInputStream(source);
+			Scanner in = new Scanner(stream)
+		) {
+			List<NeuronLayer> layers = new LinkedList<>();
+			while( in.hasNext() ) {
+				int neurons = in.nextInt();
+				int inputs = in.nextInt();
+
+				NeuronLayer layer = new NeuronLayer(neurons, inputs);
+				for( int i = 0; i < inputs; i++ ) {
+					for( int j = 0; j < neurons; j++ ) {
+						layer.weights.coefficients[i][j] = in.nextDouble();
+					}
+				}
+				for( int j = 0; j < neurons; j++ ) {
+					layer.biases[j] = in.nextDouble();
+				}
+
+				layers.add(layer);
+			}
+
+			return new NeuralNetwork(layers);
+		} catch( IOException | NoSuchElementException ex ) {
+			LOG.warn(ex, "Could not load neural network from source <%s>", source);
+		}
+		return null;
+	}*/
+
 	private NeuronLayer[] layers;
 
 	private double[][] output;
@@ -18,27 +119,36 @@ public class NeuralNetwork {
 		this(new NeuronLayer(layer1, inputs), new NeuronLayer(layer2, layer1), new NeuronLayer(outputs, layer2));
 	}
 
-	public NeuralNetwork( NeuronLayer layer1, NeuronLayer layer2 ) {
-		this.layers = new NeuronLayer[2];
-		this.layers[0] = layer1;
-		this.layers[1] = layer2;
-		layer1.connect(null, layer2);
-		layer2.connect(layer1, null);
+	public NeuralNetwork( int inputs, int layer1, int layer2, int layer3, int outputs ) {
+		this(new NeuronLayer(layer1, inputs), new NeuronLayer(layer2, layer1), new NeuronLayer(layer3, layer2), new NeuronLayer(outputs, layer3));
 	}
 
-	public NeuralNetwork( NeuronLayer layer1, NeuronLayer layer2, NeuronLayer layer3 ) {
-		this.layers = new NeuronLayer[3];
-		this.layers[0] = layer1;
-		this.layers[1] = layer2;
-		this.layers[2] = layer3;
-		layer1.connect(null, layer2);
-		layer2.connect(layer1, layer3);
-		layer3.connect(layer2, null);
+	public NeuralNetwork( List<NeuronLayer> layers ) {
+		this.layers = new NeuronLayer[layers.size()];
+		for( int i = 0; i < layers.size(); i++ ) {
+			this.layers[i] = layers.get(i);
+			if( i > 0 ) {
+				this.layers[i-1].setNextLayer(this.layers[i]);
+			}
+		}
+	}
+
+	public NeuralNetwork( NeuronLayer... layers ) {
+		this.layers = new NeuronLayer[layers.length];
+		for( int i = 0; i < layers.length; i++ ) {
+			this.layers[i] = layers[i];
+			if( i > 0 ) {
+				this.layers[i-1].setNextLayer(this.layers[i]);
+			}
+		}
 	}
 
 	public int getLayerCount() {
 		return layers.length;
 	}
+	public NeuronLayer[] getLayers() {
+		return layers;
+	}
 
 	public NeuronLayer getLayer( int i ) {
 		return layers[i - 1];
@@ -63,7 +173,7 @@ public class NeuralNetwork {
 	}
 
 	public void learn( double[][] expected ) {
-		layers[layers.length-1].backprop(expected, learningRate);
+		layers[layers.length - 1].backprop(expected, learningRate);
 	}
 
 	public void train( double[][] inputs, double[][] expected, int iterations/*, double minChange, int timeout */ ) {

src/main/java/schule/ngb/zm/util/FileLoader.java

@@ -1,6 +1,6 @@
 package schule.ngb.zm.util;
 
-import java.io.*;
+import java.io.IOException;
 import java.net.URISyntaxException;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
@@ -8,7 +8,6 @@ import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.LinkedList;
 import java.util.List;
 
 public final class FileLoader {
@@ -61,10 +60,10 @@ public final class FileLoader {
 				.lines(Paths.get(ResourceStreamProvider.getResourceURL(source).toURI()), charset)
 				.skip(n)
 				.map(
-					(line) -> Arrays
+					( line ) -> Arrays
 						.stream(line.split(Character.toString(separator)))
 						.mapToDouble(
-							(value) -> {
+							( value ) -> {
 								try {
 									return Double.parseDouble(value);
 								} catch( NumberFormatException nfe ) {

src/main/java/schule/ngb/zm/util/FontLoader.java

@@ -34,7 +34,7 @@ public class FontLoader {
 		}
 
 		// Load userfonts
-		try( InputStream in = ResourceStreamProvider.getResourceStream(source) ) {
+		try( InputStream in = ResourceStreamProvider.getInputStream(source) ) {
 			font = Font.createFont(Font.TRUETYPE_FONT, in).deriveFont(Font.PLAIN);
 
 			if( font != null ) {

src/main/java/schule/ngb/zm/util/ImageLoader.java

@@ -13,9 +13,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.lang.ref.SoftReference;
 import java.util.Map;
-import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.logging.Logger;
 
 public final class ImageLoader {
 
@@ -29,7 +27,7 @@ public final class ImageLoader {
 	 * Lädt ein Bild von der angegebenen Quelle {@code source}.
 	 * <p>
 	 * Die Bilddatei wird nach den Regeln von
-	 * {@link ResourceStreamProvider#getResourceStream(String)} gesucht und
+	 * {@link ResourceStreamProvider#getInputStream(String)} gesucht und
 	 * geöffnet. Tritt dabei ein Fehler auf oder konnte keine passende Datei
 	 * gefunden werden, wird {@code null} zurückgegeben.
 	 * <p>
@@ -70,7 +68,7 @@ public final class ImageLoader {
 		}
 
 		BufferedImage img = null;
-		try( InputStream in = ResourceStreamProvider.getResourceStream(source) ) {
+		try( InputStream in = ResourceStreamProvider.getInputStream(source) ) {
 			//URL url = ResourceStreamProvider.getResourceURL(source);
 			//BufferedImage img = ImageIO.read(url);
 

src/main/java/schule/ngb/zm/util/ResourceStreamProvider.java

@@ -3,10 +3,9 @@ package schule.ngb.zm.util;
 import schule.ngb.zm.Zeichenmaschine;
 
 import java.io.*;
+import java.net.URISyntaxException;
 import java.net.URL;
-import java.util.logging.Level;
-import java.util.logging.LogManager;
-import java.util.logging.Logger;
+import java.util.stream.StreamSupport;
 
 /**
  * Helferklasse, um {@link InputStream}s für Resourcen zu erhalten.
@@ -50,15 +49,11 @@ public class ResourceStreamProvider {
 	 *                                  einer bestehenden Resource oder falls
 	 *                                  keine passende Resource gefunden wurde.
 	 */
-	public static InputStream getResourceStream( String source ) throws NullPointerException, IllegalArgumentException, IOException {
-		if( source == null ) {
-			throw new NullPointerException("Resource source may not be null");
-		}
-		if( source.length() == 0 ) {
-			throw new IllegalArgumentException("Resource source may not be empty.");
-		}
+	public static InputStream getInputStream( String source ) throws NullPointerException, IllegalArgumentException, IOException {
+		Validator.requireNotNull(source, "Resource source may not be null");
+		Validator.requireNotEmpty(source, "Resource source may not be empty.");
 
-		InputStream in;
+		InputStream in = null;
 
 		// See if source is a readable file
 		File file = new File(source);
@@ -72,7 +67,9 @@ public class ResourceStreamProvider {
 		}
 		// File does not exist, try other means
 		// load ressource relative to .class-file
-		in = Zeichenmaschine.class.getResourceAsStream(source);
+		if( in == null ) {
+			in = Zeichenmaschine.class.getResourceAsStream(source);
+		}
 
 		// relative to ClassLoader
 		if( in == null ) {
@@ -89,6 +86,16 @@ public class ResourceStreamProvider {
 		return in;
 	}
 
+	public static InputStream getInputStream( File file ) throws IOException {
+		Validator.requireNotNull(file, "Provided file can't be null.");
+		return new FileInputStream(file);
+	}
+
+	public static InputStream getInputStream( URL url ) throws IOException {
+		Validator.requireNotNull(url, "Provided URL can't be null.");
+		return url.openStream();
+	}
+
 	/**
 	 * Ermittelt zur angegebenen Quelle einen passenden {@link URL} (<em>Unified
 	 * Resource Locator</em>). Eine passende Datei-Resource wird wie folgt
@@ -119,12 +126,8 @@ public class ResourceStreamProvider {
 	 *                                  einer bestehenden Resource.
 	 */
 	public static URL getResourceURL( String source ) throws NullPointerException, IllegalArgumentException, IOException {
-		if( source == null ) {
-			throw new NullPointerException("Resource source may not be null");
-		}
-		if( source.length() == 0 ) {
-			throw new IllegalArgumentException("Resource source may not be empty.");
-		}
+		Validator.requireNotNull(source, "Resource source may not be null");
+		Validator.requireNotEmpty(source, "Resource source may not be empty.");
 
 		File file = new File(source);
 		if( file.isFile() ) {
@@ -146,20 +149,24 @@ public class ResourceStreamProvider {
 		return new URL(source);
 	}
 
-	public static InputStream getResourceStream( File file ) throws FileNotFoundException, SecurityException {
-		if( file == null ) {
-			throw new NullPointerException("Provided file can't be null.");
-		}
+	public static OutputStream getOutputStream( String source ) throws IOException {
+		Validator.requireNotNull(source, "Resource source may not be null");
+		Validator.requireNotEmpty(source, "Resource source may not be empty.");
 
-		return new FileInputStream(file);
+		return getOutputStream(new File(source));
 	}
 
-	public static InputStream getResourceStream( URL url ) throws IOException {
-		if( url == null ) {
-			throw new NullPointerException("Provided URL can't be null.");
-		}
+	public static OutputStream getOutputStream( File file ) throws IOException {
+		Validator.requireNotNull(file, "Provided file can't be null.");
+		return new FileOutputStream(file);
+	}
 
-		return url.openStream();
+	public static Reader getReader( String source ) throws IOException {
+		return new InputStreamReader(getInputStream(source));
+	}
+
+	public static Writer getWriter( String source ) throws IOException {
+		return new OutputStreamWriter(getOutputStream(source));
 	}
 
 	private ResourceStreamProvider() {