def draw_lambdat(alpha0, beta0, Fs, K):
''' Draw new values for lambda (ARD) parameters. '''
new_lambdas = numpy.empty(K)
for k in range(0, K):
alpha, beta = updates.alpha_beta_lambdat(alpha0=alpha0,
beta0=beta0,
Fs=Fs,
k=k)
new_lambdas[k] = gamma_draw(alpha, beta)
return new_lambdas
def draw_lambdaS(alphaS, betaS, S, nonnegative):
''' Draw new values for lambda (ARD) parameters. '''
(K, L) = S.shape
new_lambdaS = numpy.empty((K, L))
alpha, beta = updates.alpha_beta_lambdaS(alphaS=alphaS,
betaS=betaS,
S=S,
nonnegative=nonnegative)
for k, l in itertools.product(range(0, K), range(0, L)):
new_lambdaS[k, l] = gamma_draw(alpha[k, l], beta[k, l])
return new_lambdaS
def init_lambdaS(init, K, L, alphaS, betaS):
''' Initialise the lambda^n_kl or lambda^m_kl parameters using the model definition. Init in ['random','exp']. '''
options = ['random', 'exp']
assert init in options, "Unknown initialisation option for element-wise sparsity lambda^S: %s. Options are %s." % (
init, options)
lambdaS = numpy.zeros((K, L))
for k, l in itertools.product(range(0, K), range(0, L)):
lambdaS[k, l] = gamma_draw(
alphaS, betaS) if init == 'random' else alphaS / float(betaS)
return lambdaS
def init_lambdak(init, K, alpha0, beta0):
''' Initialise the lambdak parameters using the model definition. Init in ['random','exp']. '''
options = ['random', 'exp']
assert init in options, "Unknown initialisation option for lambdak: %s. Options are %s." % (
init, options)
lambdak = numpy.zeros(K)
for k in range(0, K):
lambdak[k] = gamma_draw(
alpha0, beta0) if init == 'random' else alpha0 / float(beta0)
return lambdak
def draw_importance(alphaA, betaA, tau, dataset, mask, F, G, S=None):
''' Draw new values for alpha (dataset importance) parameter. '''
alpha, beta = updates.alpha_beta_importance(alphaA=alphaA,
betaA=betaA,
tau=tau,
dataset=dataset,
mask=mask,
F=F,
G=G,
S=S)
importance = gamma_draw(alpha, beta)
return importance
def draw_tau(alphatau, betatau, importance, dataset, mask, F, G, S=None):
''' Draw new values for tau (noise) parameter. '''
alpha, beta = updates.alpha_beta_tau(alphatau=alphatau,
betatau=betatau,
importance=importance,
dataset=dataset,
mask=mask,
F=F,
G=G,
S=S)
tau = gamma_draw(alpha, beta)
return tau
def init_tau(init, alphatau, betatau, importance, R, M, F, G, S=None):
''' Initialise the tau parameter using the model definition. Init in ['random','exp']. '''
options = ['random', 'exp']
assert init in options, "Unknown initialisation option for tau: %s. Options are %s." % (
init, options)
alpha, beta = updates_Gibbs.alpha_beta_tau(alphatau=alphatau,
betatau=betatau,
importance=importance,
dataset=R,
mask=M,
F=F,
G=G,
S=S)
return gamma_draw(alpha, beta) if init == 'random' else alpha / float(beta)
def run(self, iterations):
self.all_F = numpy.zeros((iterations, self.I, self.K))
self.all_S = numpy.zeros((iterations, self.K, self.L))
self.all_G = numpy.zeros((iterations, self.J, self.L))
self.all_tau = numpy.zeros(iterations)
self.all_times = [] # to plot performance against time
metrics = ['MSE', 'R^2', 'Rp']
self.all_performances = {} # for plotting convergence of metrics
for metric in metrics:
self.all_performances[metric] = []
time_start = time.time()
for it in range(0, iterations):
for k in range(0, self.K):
tauFk = self.tauF(k)
muFk = self.muF(tauFk, k)
self.F[:, k] = TN_vector_draw(muFk, tauFk)
for k, l in itertools.product(xrange(0, self.K), xrange(0,
self.L)):
tauSkl = self.tauS(k, l)
muSkl = self.muS(tauSkl, k, l)
self.S[k, l] = TN_draw(muSkl, tauSkl)
for l in range(0, self.L):
tauGl = self.tauG(l)
muGl = self.muG(tauGl, l)
self.G[:, l] = TN_vector_draw(muGl, tauGl)
self.tau = gamma_draw(self.alpha_s(), self.beta_s())
self.all_F[it], self.all_S[it], self.all_G[it], self.all_tau[
it] = numpy.copy(self.F), numpy.copy(self.S), numpy.copy(
self.G), self.tau
perf = self.predict_while_running()
for metric in metrics:
self.all_performances[metric].append(perf[metric])
print "Iteration %s. MSE: %s. R^2: %s. Rp: %s." % (
it + 1, perf['MSE'], perf['R^2'], perf['Rp'])
time_iteration = time.time()
self.all_times.append(time_iteration - time_start)
return (self.all_F, self.all_S, self.all_G, self.all_tau)
def run(self, iterations):
self.all_U = numpy.zeros((iterations, self.I, self.K))
self.all_V = numpy.zeros((iterations, self.J, self.K))
self.all_tau = numpy.zeros(iterations)
self.all_times = [] # to plot performance against time
metrics = ['MSE', 'R^2', 'Rp']
self.all_performances = {} # for plotting convergence of metrics
for metric in metrics:
self.all_performances[metric] = []
time_start = time.time()
for it in range(0, iterations):
for k in range(0, self.K):
tauUk = self.tauU(k)
muUk = self.muU(tauUk, k)
self.U[:, k] = TN_vector_draw(muUk, tauUk)
for k in range(0, self.K):
tauVk = self.tauV(k)
muVk = self.muV(tauVk, k)
self.V[:, k] = TN_vector_draw(muVk, tauVk)
self.tau = gamma_draw(self.alpha_s(), self.beta_s())
self.all_U[it], self.all_V[it], self.all_tau[it] = numpy.copy(
self.U), numpy.copy(self.V), self.tau
perf = self.predict_while_running()
for metric in metrics:
self.all_performances[metric].append(perf[metric])
print "Iteration %s. MSE: %s. R^2: %s. Rp: %s." % (
it + 1, perf['MSE'], perf['R^2'], perf['Rp'])
time_iteration = time.time()
self.all_times.append(time_iteration - time_start)
return (self.all_U, self.all_V, self.all_tau)
