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
|
# -*- coding: utf-8 -*-
"""
demo of Optimal transport for domain adaptation
"""
import numpy as np
import matplotlib.pylab as pl
import ot
#%% parameters
n=150 # nb samples in source and target datasets
xs,ys=ot.datasets.get_data_classif('3gauss',n)
xt,yt=ot.datasets.get_data_classif('3gauss2',n)
#%% plot samples
pl.figure(1)
pl.subplot(2,2,1)
pl.scatter(xs[:,0],xs[:,1],c=ys,marker='+',label='Source samples')
pl.legend(loc=0)
pl.title('Source distributions')
pl.subplot(2,2,2)
pl.scatter(xt[:,0],xt[:,1],c=yt,marker='o',label='Target samples')
pl.legend(loc=0)
pl.title('target distributions')
#%% OT estimation
# LP problem
da_emd=ot.da.OTDA() # init class
da_emd.fit(xs,xt) # fit distributions
xst0=da_emd.interp() # interpolation of source samples
# sinkhorn regularization
lambd=1e-1
da_entrop=ot.da.OTDA_sinkhorn()
da_entrop.fit(xs,xt,reg=lambd)
xsts=da_entrop.interp()
# Group lasso regularization
reg=1e-1
eta=1e0
da_lpl1=ot.da.OTDA_lpl1()
da_lpl1.fit(xs,ys,xt,reg=lambd,eta=eta)
xstg=da_lpl1.interp()
#%% plot interpolated source samples
pl.figure(4)
param_img={'interpolation':'nearest','cmap':'jet'}
pl.subplot(2,3,1)
pl.imshow(da_emd.G,**param_img)
pl.title('OT matrix')
pl.subplot(2,3,2)
pl.imshow(da_entrop.G,**param_img)
pl.title('OT matrix sinkhorn')
pl.subplot(2,3,3)
pl.imshow(da_lpl1.G,**param_img)
pl.title('OT matrix Group Lasso')
pl.subplot(2,3,4)
pl.scatter(xt[:,0],xt[:,1],c=yt,marker='o',label='Target samples',alpha=0.3)
pl.scatter(xst0[:,0],xst0[:,1],c=ys,marker='+',label='Transp samples',s=30)
pl.title('Interp samples')
pl.legend(loc=0)
pl.subplot(2,3,5)
pl.scatter(xt[:,0],xt[:,1],c=yt,marker='o',label='Target samples',alpha=0.3)
pl.scatter(xsts[:,0],xsts[:,1],c=ys,marker='+',label='Transp samples',s=30)
pl.title('Interp samples Sinkhorn')
pl.subplot(2,3,6)
pl.scatter(xt[:,0],xt[:,1],c=yt,marker='o',label='Target samples',alpha=0.3)
pl.scatter(xstg[:,0],xstg[:,1],c=ys,marker='+',label='Transp samples',s=30)
pl.title('Interp samples Group Lasso')
|
