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import numpy as N
from scipy.sandbox.pyem import GM, GMM
import copy
def bench1(mode = 'diag'):
#===========================================
# GMM of 20 comp, 20 dimension, 1e4 frames
#===========================================
d = 15
k = 30
nframes = 1e5
niter = 10
mode = 'diag'
print "============================================================="
print "(%d dim, %d components) GMM with %d iterations, for %d frames" \
% (d, k, niter, nframes)
#+++++++++++++++++++++++++++++++++++++++++++
# Create an artificial GMM model, samples it
#+++++++++++++++++++++++++++++++++++++++++++
print "Generating the mixture"
# Generate a model with k components, d dimensions
w, mu, va = GM.gen_param(d, k, mode, spread = 3)
# gm = GM(d, k, mode)
# gm.set_param(w, mu, va)
gm = GM.fromvalues(w, mu, va)
# Sample nframes frames from the model
data = gm.sample(nframes)
#++++++++++++++++++++++++
# Learn the model with EM
#++++++++++++++++++++++++
# Init the model
print "Init a model for learning, with kmean for initialization"
lgm = GM(d, k, mode)
gmm = GMM(lgm, 'kmean')
gmm.init(data)
# Keep the initialized model for drawing
gm0 = copy.copy(lgm)
# The actual EM, with likelihood computation
like = N.zeros(niter)
print "computing..."
for i in range(niter):
print "iteration %d" % i
g, tgd = gmm.sufficient_statistics(data)
like[i] = N.sum(N.log(N.sum(tgd, 1)))
gmm.update_em(data, g)
if __name__ == "__main__":
import hotshot, hotshot.stats
profile_file = 'gmm.prof'
prof = hotshot.Profile(profile_file, lineevents=1)
prof.runcall(bench1)
p = hotshot.stats.load(profile_file)
print p.sort_stats('cumulative').print_stats(20)
prof.close()
# import profile
# profile.run('bench1()', 'gmmprof')
# import pstats
# p = pstats.Stats('gmmprof')
# print p.sort_stats('cumulative').print_stats(20)
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