-
Notifications
You must be signed in to change notification settings - Fork 0
/
OneGramFrequencies.java
189 lines (170 loc) · 7.44 KB
/
OneGramFrequencies.java
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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
import java.io.*;
import java.util.*;
import java.util.logging.*;
public class OneGramFrequencies {
public static OneGramFrequencies Get(boolean onlyLetters) {
if(letterFrequencies == null) {
letterFrequencies = new OneGramFrequencies(onlyLetters);
letterFrequencies.getStandardFrequencies();//Pre-load
}
return letterFrequencies;
}
public static void main(String[] args) {
if(args.length > 0) {
OneGramFrequencies lf = new OneGramFrequencies(false);
Map<String,Float> props = lf.getStandardFrequencies();
for(String arg : FileUtil.GetFilename(args)) {
Map<String,Float> fileFrequencies = lf.getFileFrequencies(arg);
//print(fileFrequencies);
Map<String,Float> percentDiff = lf.getPercentDifference(fileFrequencies);
float standardDeviation = lf.getStandardDeviation(percentDiff);
float KLDivergence = lf.getKLDivergence(fileFrequencies);
System.out.println(arg + "\t Standard Deviation: " + standardDeviation
+ "\t K-L Divergence: " + KLDivergence);
}
} else {
OneGramFrequencies lf = new OneGramFrequencies(false);
Map<String,Float> props = lf.getStandardFrequencies();
Map<String,Float> percentDiff = lf.getPercentDifference(props);
float standardDeviation = lf.getStandardDeviation(percentDiff);
System.out.println("StandardDeviation:" + standardDeviation);
float KLDivergence = lf.getKLDivergence(props);
}
}
public static float GetStandardDeviation(String filename, boolean onlyLetters) {
OneGramFrequencies lf = new OneGramFrequencies(onlyLetters);
Map props = lf.getStandardFrequencies();
Map fileFrequencies = lf.getFileFrequencies(filename);
Map<String,Float> percentDiff = lf.getPercentDifference(fileFrequencies);
float standardDeviation = lf.getStandardDeviation(percentDiff);
return standardDeviation;
}
public static float GetKLDivergence(String filename, boolean onlyLetters) {
OneGramFrequencies lf = new OneGramFrequencies(onlyLetters);
Map props = lf.getStandardFrequencies();
Map fileFrequencies = lf.getFileFrequencies(filename);
float KLDivergence = lf.getKLDivergence(fileFrequencies);
return KLDivergence;
}
public OneGramFrequencies(boolean onlyLetters) {
this.onlyLetters = onlyLetters;
}
private void loadStandard() {
if(standardFrequencies != null) {
return;
}
Properties properties = FileUtil.LoadProperties("OneGramFrequencies.properties");
standardFrequencies = new TreeMap<String,Float>();
FileUtil.Copy(properties, standardFrequencies);
logger.fine("loadStandard: " + standardFrequencies);
}
/**
* @see http://en.wikipedia.org/wiki/Kullback-Leibler_divergence
*/
public float getKLDivergence(Map<String,Float> frequencies) {
double klDivergence = 0.0d;
for(Map.Entry<String,Float> standardFrequency : standardFrequencies.entrySet()) {
double p = standardFrequency.getValue();
double q = 0.0d;
if(frequencies.containsKey(standardFrequency.getKey())) {
q = frequencies.get(standardFrequency.getKey());
}
double temp = p * Math.log(p / q);
klDivergence += temp;
}
logger.fine("getKLDivergence: " + klDivergence);
return (float)klDivergence;
}
public Map<String,Float> getStandardFrequencies() {
loadStandard();
return standardFrequencies;
}
public Map<String,Float> getPercentDifference(Map<String,Float> frequencies) {
loadStandard();
Map<String,Float> percentDifference = new HashMap<String,Float>();
for(Map.Entry<String,Float> standardFrequency : standardFrequencies.entrySet()) {
Float frequency = frequencies.get(standardFrequency.getKey());
if(frequency == null) {
frequency = 0.0f;
}
float percent = frequency / standardFrequency.getValue();
percentDifference.put(standardFrequency.getKey(), Float.valueOf(percent));
}
logger.fine("getPercentDifference: " + percentDifference);
return percentDifference;
}
public float getStandardDeviation(String data) {
return getStandardDeviation(getPercentDifference(getFrequencies(data)));
}
public float getStandardDeviation(Map<String,Float> percentDifferences) {
return getStandardDeviation(percentDifferences.values());
}
/**
* Assumes average is 1.0.
*/
public float getStandardDeviation(Collection<Float> values) {
double runningTotal = 0.0;
for(Float value : values) {
float deviation = value - 1.0f;
double square = deviation * deviation;
runningTotal += square;
}
float standardDeviation = (float)Math.sqrt(runningTotal / values.size());
logger.fine("getStandardDeviation: " + standardDeviation);
return standardDeviation;
}
public Map<String,Float> getFrequencies(String data) {
Map<String,MutableInteger> counts = new HashMap<String,MutableInteger>();
MutableInteger totalLetters = new MutableInteger();
recordCounts(counts, data, totalLetters);
logger.fine("Counts: " + counts);
return getFrequencies(counts, totalLetters.getValue());
}
public void recordCounts(Map<String,MutableInteger> counts, String data, MutableInteger totalLetters) {
for(int index = 0; index < data.length(); index++) {
char chr = data.charAt(index);
if(!onlyLetters || Character.isLetter(chr)) {
String key = String.valueOf(Character.toLowerCase(chr));
MutableInteger mi = counts.get(key);
if(mi == null) {
mi = new MutableInteger();
counts.put(key, mi);
}
mi.increment();
totalLetters.increment();
}
}
}
public Map<String,Float> getFileFrequencies(String filename) {
Map<String,MutableInteger> counts = new HashMap<String,MutableInteger>();
MutableInteger totalLetters = new MutableInteger();
for(String line : FileUtil.Read(filename)) {
recordCounts(counts, line, totalLetters);
}
logger.fine("Counts: " + counts);
return getFrequencies(counts, totalLetters.getValue());
}
public static void print(Map<String,Float> frequencies) {
for(Map.Entry<String,Float> entry : frequencies.entrySet()) {
System.out.println(entry);
}
}
private Map<String,Float> getFrequencies(Map<String,MutableInteger> counts, int totalLetters) {
Map<String,Float> frequencies = new TreeMap<String,Float>();
for(Map.Entry<String,MutableInteger> entry : counts.entrySet()) {
frequencies.put(entry.getKey(), (float)((float)entry.getValue().getValue())/totalLetters);
}
if(totalLetters > 100) {//Probably a file
logger.fine("Frequencies: " + frequencies);
//print(frequencies);
} else {//Probably a word
logger.fine("Frequencies: " + frequencies);
}
return frequencies;
}
private boolean onlyLetters;//Only record letters
private Map<String,Float> standardFrequencies;
private Logger logger = Logger.getLogger(getClass().getName());
private static OneGramFrequencies letterFrequencies;
private static Logger sLogger = Logger.getLogger(OneGramFrequencies.class.getName());
}