ParallelRearrangeNBest2.java
3.17 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
package decoder;
import is2.data.DataF;
import is2.data.Edges;
import is2.data.Parse;
import is2.data.ParseNBest;
import java.util.ArrayList;
import java.util.concurrent.Callable;
import decoder.ParallelRearrangeNBest.PA;
import extractors.Extractor;
/**
* @author Dr. Bernd Bohnet, 30.08.2009
*
* This class implements a parallel edge rearrangement for non-projective parsing;
* The linear method was first suggest by Rayn McDonald et. al. 2005.
*/
final public class ParallelRearrangeNBest2 implements Callable<Object> {
// new parent child combination to explore
final static class PA {
final float p;
final short ch, pa;
public short[] heads,types;
public PA(Parse p, short ch2, short pa2) {
this.p =(float)p.f1;
heads =p.heads;
types=p.labels;
ch=ch2;pa=pa2;
}
}
// list of parent child combinations
private static ArrayList<PA> parents = new ArrayList<PA>();
// some data from the dependency tree
private short[] pos;
private DataF x;
private float lastNBest;
private float threshold;
private Extractor extractor;
/**
* Initialize the parallel rearrange thread
* @param pos the part-of-speech
* @param x the data
* @param lastNBest
* @param isChild2 is a child
* @param edgesC the part-of-speech edge mapping
* @param s the heads
* @param ts the types
*/
public ParallelRearrangeNBest2(short[] pos , DataF x, float lastNBest, Extractor extractor, float threshold) {
this.lastNBest =lastNBest;
this.pos =pos;
this.x=x;
this.extractor = extractor;
this.threshold = threshold;
}
public ArrayList<ParseNBest> parses = new ArrayList<ParseNBest>();
@Override
public Object call() {
try {
while(true) {
PA p = getPA();
if (p==null) return parses;
short oldP = p.heads[p.ch], oldT = p.types[p.ch];
p.heads[p.ch]=p.pa;
short[] labels = Edges.get(pos[p.pa], pos[p.ch],p.ch<p.pa);
for(int l=0;l<labels.length;l++) {
p.types[p.ch]=labels[l];
float p_new = extractor.encode3(pos, p.heads, p.types, x);
if (p_new<lastNBest || ((p.p+this.threshold)>p_new)) continue;
ParseNBest x = new ParseNBest();
x.signature(p.heads, p.types);
x.f1=p_new;
parses.add(x);
}
// change back
p.heads[p.ch]= oldP; p.types[p.ch]=oldT;
// consider changes to labels only
labels = Edges.get(pos[oldP], pos[p.ch],p.ch<oldP);
for(int l=0;l<labels.length;l++) {
p.types[p.ch]=labels[l];
float p_new = (float) extractor.encode3(pos, p.heads, p.types, x);
// optimization: add only if larger than smallest of n-best
if (p_new<lastNBest || ((p.p+this.threshold)>p_new)) continue;
ParseNBest x = new ParseNBest();
x.signature(p.heads, p.types);
x.f1=p_new;
parses.add(x);
}
p.heads[p.ch]= oldP; p.types[p.ch]=oldT;
}
} catch(Exception e) {
e.printStackTrace();
}
return parses;
}
/**
* Add a child-parent combination which are latter explored for rearrangement
*
* @param p2
* @param ch2
* @param pa
*/
public static void add(Parse p, short ch2, short pa) {
parents.add(new PA(p,ch2,pa));
}
public static PA getPA() {
synchronized(parents) {
if (parents.size()==0) return null;
return parents.remove(parents.size()-1);
}
}
}