com.atilika.kuromoji.viterbi.ViterbiFormatter Maven / Gradle / Ivy
/**
* Copyright © 2010-2015 Atilika Inc. and contributors (see CONTRIBUTORS.md)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the
* License is distributed with this work in the LICENSE.md file. You may
* also obtain a copy of the License from
*
* 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.atilika.kuromoji.viterbi;
import com.atilika.kuromoji.dict.ConnectionCosts;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ViterbiFormatter {
private final static String BOS_LABEL = "BOS";
private final static String EOS_LABEL = "EOS";
private final static String FONT_NAME = "Helvetica";
private ConnectionCosts costs;
private Map nodeMap;
private Map bestPathMap;
private boolean foundBOS;
public ViterbiFormatter(ConnectionCosts costs) {
this.costs = costs;
this.nodeMap = new HashMap<>();
this.bestPathMap = new HashMap<>();
}
public String format(ViterbiLattice lattice) {
return format(lattice, null);
}
public String format(ViterbiLattice lattice, List bestPath) {
initBestPathMap(bestPath);
StringBuilder builder = new StringBuilder();
builder.append(formatHeader());
builder.append(formatNodes(lattice));
builder.append(formatTrailer());
return builder.toString();
}
private void initBestPathMap(List bestPath) {
this.bestPathMap.clear();
if (bestPath == null) {
return;
}
for (int i = 0; i < bestPath.size() - 1; i++) {
ViterbiNode from = bestPath.get(i);
ViterbiNode to = bestPath.get(i + 1);
String fromId = getNodeId(from);
String toId = getNodeId(to);
assert this.bestPathMap.containsKey(fromId) == false;
assert this.bestPathMap.containsValue(toId) == false;
this.bestPathMap.put(fromId, toId);
}
}
private String formatNodes(ViterbiLattice lattice) {
ViterbiNode[][] startsArray = lattice.getStartIndexArr();
ViterbiNode[][] endsArray = lattice.getEndIndexArr();
this.nodeMap.clear();
this.foundBOS = false;
StringBuilder builder = new StringBuilder();
for (int i = 1; i < endsArray.length; i++) {
if (endsArray[i] == null || startsArray[i] == null) {
continue;
}
for (int j = 0; j < endsArray[i].length; j++) {
ViterbiNode from = endsArray[i][j];
if (from == null) {
continue;
}
builder.append(formatNodeIfNew(from));
for (int k = 0; k < startsArray[i].length; k++) {
ViterbiNode to = startsArray[i][k];
if (to == null) {
break;
}
builder.append(formatNodeIfNew(to));
builder.append(formatEdge(from, to));
}
}
}
return builder.toString();
}
private String formatNodeIfNew(ViterbiNode node) {
String nodeId = getNodeId(node);
if (!this.nodeMap.containsKey(nodeId)) {
this.nodeMap.put(nodeId, node);
return formatNode(node);
} else {
return "";
}
}
private String formatHeader() {
StringBuilder builder = new StringBuilder();
builder.append("digraph viterbi {\n");
builder.append("graph [ fontsize=30 labelloc=\"t\" label=\"\" splines=true overlap=false rankdir = \"LR\" ];\n");
builder.append("# A2 paper size\n");
builder.append("size = \"34.4,16.5\";\n");
builder.append("# try to fill paper\n");
builder.append("ratio = fill;\n");
builder.append("edge [ fontname=\"" + FONT_NAME + "\" fontcolor=\"red\" color=\"#606060\" ]\n");
builder.append("node [ style=\"filled\" fillcolor=\"#e8e8f0\" shape=\"Mrecord\" fontname=\"" + FONT_NAME + "\" ]\n");
return builder.toString();
}
private String formatTrailer() {
return "}";
}
private String formatEdge(ViterbiNode from, ViterbiNode to) {
if (this.bestPathMap.containsKey(getNodeId(from)) &&
this.bestPathMap.get(getNodeId(from)).equals(getNodeId(to))) {
return formatEdge(from, to, "color=\"#40e050\" fontcolor=\"#40a050\" penwidth=3 fontsize=20 ");
} else {
return formatEdge(from, to, "");
}
}
private String formatEdge(ViterbiNode from, ViterbiNode to, String attributes) {
StringBuilder builder = new StringBuilder();
builder.append(getNodeId(from));
builder.append(" -> ");
builder.append(getNodeId(to));
builder.append(" [ ");
builder.append("label=\"");
builder.append(getCost(from, to));
builder.append("\"");
builder.append(" ");
builder.append(attributes);
builder.append(" ");
builder.append(" ]");
builder.append("\n");
return builder.toString();
}
private String formatNode(ViterbiNode node) {
StringBuilder builder = new StringBuilder();
builder.append("\"");
builder.append(getNodeId(node));
builder.append("\"");
builder.append(" [ ");
builder.append("label=");
builder.append(formatNodeLabel(node));
if (node.getType() == ViterbiNode.Type.USER) {
builder.append(" fillcolor=\"#e8f8e8\"");
} else if (node.getType() == ViterbiNode.Type.UNKNOWN) {
builder.append(" fillcolor=\"#f8e8f8\"");
} else if (node.getType() == ViterbiNode.Type.INSERTED) {
builder.append(" fillcolor=\"#ffe8e8\"");
}
builder.append(" ]");
return builder.toString();
}
private String formatNodeLabel(ViterbiNode node) {
StringBuilder builder = new StringBuilder();
builder.append("<");
builder.append("");
builder.append(getNodeLabel(node));
builder.append(" ");
builder.append("");
builder.append(node.getWordCost());
builder.append("");
builder.append("
>");
return builder.toString();
}
private String getNodeId(ViterbiNode node) {
return String.valueOf(node.hashCode());
}
private String getNodeLabel(ViterbiNode node) {
if (node.getType() == ViterbiNode.Type.KNOWN && node.getWordId() == 0) {
if (this.foundBOS) {
return EOS_LABEL;
} else {
this.foundBOS = true;
return BOS_LABEL;
}
} else {
return node.getSurface();
}
}
private int getCost(ViterbiNode from, ViterbiNode to) {
return this.costs.get(from.getLeftId(), to.getRightId());
}
}