-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
279 lines (263 loc) · 9.04 KB
/
index.js
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
/**
* Matrix and tensor operations.
* @author Jack Peterson (jack@tinybike.net)
*/
"use strict";
var n = require("norm.js");
module.exports = {
multiply: function (a, b) {
var i, j, k;
var arows = a.length;
if (arows) {
var acols = a[0].length;
if (acols) {
var brows = b.length;
if (brows) {
var bcols = b[0].length;
if (bcols) {
var c = new Array(arows);
if (bcols > 1) {
for (i = 0; i < arows; ++i) {
c[i] = new Array(bcols);
for (j = 0; j < bcols; ++j) {
c[i][j] = 0;
}
}
} else {
for (i = 0; i < arows; ++i) {
c[i] = 0;
}
}
for (i = 0; i < arows; ++i) {
for (j = 0; j < bcols; ++j) {
for (k = 0; k < acols; ++k) {
if (bcols === 1) {
c[i] += a[i][k] * b[k];
} else {
c[i][j] += a[i][k] * b[k][j];
}
}
}
}
return c;
}
}
}
}
},
outer: function (u, v) {
var i, j;
var usz = u.length;
var p = new Array(usz);
for (i = 0; i < usz; ++i) {
p[i] = new Array(usz);
for (j = 0; j < usz; ++j) {
p[i][j] = 0;
}
}
for (i = 0; i < usz; ++i) {
for (j = 0; j < usz; ++j) {
p[i][j] += u[i] * v[j];
}
}
return p;
},
transpose: function (a) {
var i, j;
var arows = a.length;
var acols = a[0].length;
var at = new Array(acols);
for (i = 0; i < arows; ++i) {
at[i] = new Array(arows);
}
for (i = 0; i < acols; ++i) {
for (j = 0; j < arows; ++j) {
at[i][j] = a[j][i];
}
}
return at;
},
// Dot (inner) product of vectors.
dot: function (u, v) {
var prod = 0;
for (var i = 0, usz = u.length; i < usz; ++i) {
prod += u[i] * v[i];
}
return prod;
},
any: function (a) { return !!n.sum(a); },
mask: function (a, target) {
var asz = a.length;
var amask = new Array(asz);
for (var i = 0; i < asz; ++i) {
if (a[i] === target) {
amask[i] = 1;
} else {
amask[i] = 0;
}
}
return amask;
},
diag: function (a) {
var asz = a.length;
var d = new Array(asz);
for (var i = 0; i < asz; ++i) {
d[i] = new Array(asz);
for (var j = 0; j < asz; ++j) {
if (i === j) {
d[i][j] = a[i];
} else {
d[i][j] = 0;
}
}
}
return d;
},
kron: function (a, b) {
var asz = a.length;
var bsz = b.length;
var prod = new Array(asz * bsz);
for (var i = 0; i < asz; ++i) {
for (var j = 0; j < bsz; ++j) {
prod[j + bsz*i] = a[i] * b[j];
}
}
return prod;
},
hadamard: function (a, arows, acols, b, brows, bcols) {
var i, j;
var c = new Array(arows);
if (bcols > 1) {
for (i = 0; i < bcols; ++i) {
c[i] = new Array(bcols);
}
}
for (i = 0; i < arows; ++i) {
if (bcols === 1 && acols === 1) {
c[i] = a[i] * b[i];
} else {
for (j = 0; j < bcols; ++j) {
c[i][j] += a[i][j] * b[i][j];
}
}
}
return c;
},
cov: function (data, rows, cols, unbias) {
// Covariance matrix.
//
// Args:
// data: two-dimensional data matrix (signals = columns, samples = rows)
// rows: number of rows (samples per signal) in the data matrix
// cols: number of columns (signals) in the data matrix
//
var tensor = new Array(cols);
for (var i = 0; i < cols; ++i) {
tensor[i] = new Array(cols);
for (var j = 0; j < cols; ++j) {
var u = 0;
for (var row = 0; row < rows; ++row) {
var i_mean = 0;
var j_mean = 0;
for (var r = 0; r < rows; ++r) {
i_mean += data[r][i];
j_mean += data[r][j];
}
i_mean /= rows;
j_mean /= rows;
var i_center = data[row][i] - i_mean;
var j_center = data[row][j] - j_mean;
u += i_center * j_center;
}
tensor[i][j] = u / parseFloat(rows - unbias);
}
}
return tensor;
},
coskew: function (data, rows, cols, unbias) {
// Block-unfolded third joint central moment tensor.
//
// Args:
// data: two-dimensional data matrix (signals = columns, samples = rows)
// rows: number of rows (samples per signal) in the data matrix
// cols: number of columns (signals) in the data matrix
//
var tensor = new Array(cols);
for (var k = 0; k < cols; ++k) {
var face = new Array(cols);
for (var i = 0; i < cols; ++i) {
face[i] = new Array(cols);
for (var j = 0; j < cols; ++j) {
var u = 0;
for (var row = 0; row < rows; ++row) {
var i_mean = 0;
var j_mean = 0;
var k_mean = 0;
for (var r = 0; r < rows; ++r) {
i_mean += data[r][i];
j_mean += data[r][j];
k_mean += data[r][k];
}
i_mean /= rows;
j_mean /= rows;
k_mean /= rows;
var i_center = data[row][i] - i_mean;
var j_center = data[row][j] - j_mean;
var k_center = data[row][k] - k_mean;
u += i_center * j_center * k_center;
}
face[i][j] = u / parseFloat(rows - unbias);
}
tensor[k] = face;
}
}
return tensor;
},
cokurt: function (data, rows, cols, unbias) {
// Block-unfolded fourth joint central moment tensor.
//
// Args:
// data: two-dimensional data matrix (signals = columns, samples = rows)
// rows: number of rows (samples per signal) in the data matrix
// cols: number of columns (signals) in the data matrix
//
var tensor = new Array(cols);
for (var l = 0; l < cols; ++l) {
var block = new Array(cols);
for (var k = 0; k < cols; ++k) {
var face = new Array(cols);
for (var i = 0; i < cols; ++i) {
face[i] = new Array(cols);
for (var j = 0; j < cols; ++j) {
var u = 0;
for (var row = 0; row < rows; ++row) {
var i_mean = 0;
var j_mean = 0;
var k_mean = 0;
var l_mean = 0;
for (var r = 0; r < rows; ++r) {
i_mean += data[r][i];
j_mean += data[r][j];
k_mean += data[r][k];
l_mean += data[r][l];
}
i_mean /= rows;
j_mean /= rows;
k_mean /= rows;
l_mean /= rows;
var i_center = data[row][i] - i_mean;
var j_center = data[row][j] - j_mean;
var k_center = data[row][k] - k_mean;
var l_center = data[row][l] - l_mean;
u += i_center * j_center * k_center * l_center;
}
face[i][j] = u / parseFloat(rows - unbias);
}
block[k] = face;
}
tensor[l] = block;
}
}
return tensor;
}
};