X.sort(0)
Kf = GPy.kern.RBF(1) + GPy.kern.White(1, 1e-6)
S = Kf.K(X)
means = np.vstack([
np.tile(np.random.multivariate_normal(np.zeros(Nx), S, 1), (N, 1))
for N in Nobs
]) # GP draws for mean of each cluster
#add GP draw for noise
Ky = GPy.kern.RBF(1, 0.3, 1) + GPy.kern.White(1, 0.001)
Y = means + np.random.multivariate_normal(np.zeros(Nx), Ky.K(X),
means.shape[0])
#construct model
m = MOHGP(X, Kf.copy(), Ky.copy(), Y, K=Nclust)
m.constrain_positive('')
m.optimize()
m.preferred_optimizer = 'bfgs'
m.systematic_splits()
m.remove_empty_clusters(1e-3)
m.plot(1, 1, 1, 0, 0, 1)
raw_input('press enter to continue ...')
#and again without structure
Y -= Y.mean(1)[:, None]
Y /= Y.std(1)[:, None]
m2 = MOHGP(X, Kf, GPy.kern.White(1), Y, K=Nclust)
m2.constrain_positive('')
m2.preferred_optimizer = 'bfgs'
X.sort(0)
Kf = kern.rbf(1) + kern.white(1, 1e-6)
S = Kf.K(X)
means = np.vstack([
np.tile(np.random.multivariate_normal(np.zeros(Nx), S, 1), (N, 1))
for N in Nobs
]) # GP draws for mean of each cluster
#add GP draw for noise
Ky = kern.rbf(1, 0.3, 1) + kern.white(1, 0.001)
Y = means + np.random.multivariate_normal(np.zeros(Nx), Ky.K(X),
means.shape[0])
#construct model
m = MOHGP(X, Kf.copy(), Ky.copy(), Y, K=Nclust)
m.constrain_positive('')
m.optimize()
m.preferred_optimizer = 'bfgs'
m.systematic_splits()
m.remove_empty_clusters(1e-3)
m.plot(1, 1, 1, 0, 0, 1)
raw_input('press enter to continue ...')
#and again without structure
Y -= Y.mean(1)[:, None]
Y /= Y.std(1)[:, None]
m2 = MOHGP(X, Kf, kern.white(1), Y, K=Nclust)
m2.constrain_positive('')
m2.preferred_optimizer = 'bfgs'
np.tile(np.sin(f * X + p).T, (Ni, 1))
for f, p, Ni in zip(freqs, phases, Nobs)
])
#add a lower freq sin for the noise
freqs = .4 * np.pi + 0.01 * (np.random.rand(means.shape[0]) - .5)
phases = 2 * np.pi * np.random.rand(means.shape[0])
offsets = 0.3 * np.vstack([np.sin(f * X + p).T for f, p in zip(freqs, phases)])
Y = means + offsets + np.random.randn(*means.shape) * 0.05
#construct full model
Kf = kern.rbf(1, 0.01, 0.001)
Ky1 = kern.rbf(1, 0.1, 0.001)
Ky2 = kern.white(1, 0.01)
Ky = Ky1 + Ky2
m = MOHGP(X, Kf, Ky, Y, K=Nclust, prior_Z='DP', alpha=alpha)
m.ensure_default_constraints()
m.checkgrad(verbose=1)
m.randomize()
m.optimize()
m.systematic_splits()
m.systematic_splits()
m.plot(1, 1, 1, 0, 0, 1)
#construct model without structure
#give it a fighting chance by normalising signals first
Y = Y.copy()
Y -= Y.mean(1)[:, None]
Y /= Y.std(1)[:, None]
Kf = kern.rbf(1, 0.01, 0.001)
