def get_OracleKernelAdaptiveLangevin_instance(D, target_log_pdf):
step_size = 1.
m = 500
N = 5000
Z = sample_banana(N, D, bananicity, V)
surrogate = KernelExpFiniteGaussian(sigma=10, lmbda=.001, m=m, D=D)
surrogate.fit(Z)
if False:
param_bounds = {'sigma': [-2, 3]}
bo = BayesOptSearch(surrogate, Z, param_bounds)
best_params = bo.optimize()
surrogate.set_parameters_from_dict(best_params)
if False:
sigma = 1. / gamma_median_heuristic(Z)
surrogate.set_parameters_from_dict({'sigma': sigma})
logger.info("kernel exp family uses %s" % surrogate.get_parameters())
if False:
import matplotlib.pyplot as plt
Xs = np.linspace(-30, 30, 50)
Ys = np.linspace(-20, 40, 50)
visualise_fit_2d(surrogate, Z, Xs, Ys)
plt.show()
instance = OracleKernelAdaptiveLangevin(D, target_log_pdf, surrogate,
step_size)
return instance
def get_OracleKernelAdaptiveLangevin_instance(D, target_log_pdf):
step_size = 1.
m = 500
N = 5000
Z = sample_banana(N, D, bananicity, V)
surrogate = KernelExpFiniteGaussian(sigma=10, lmbda=.001, m=m, D=D)
surrogate.fit(Z)
if False:
param_bounds = {'sigma': [-2, 3]}
bo = BayesOptSearch(surrogate, Z, param_bounds)
best_params = bo.optimize()
surrogate.set_parameters_from_dict(best_params)
if False:
sigma = 1. / gamma_median_heuristic(Z)
surrogate.set_parameters_from_dict({'sigma': sigma})
logger.info("kernel exp family uses %s" % surrogate.get_parameters())
if False:
import matplotlib.pyplot as plt
Xs = np.linspace(-30, 30, 50)
Ys = np.linspace(-20, 40, 50)
visualise_fit_2d(surrogate, Z, Xs, Ys)
plt.show()
instance = OracleKernelAdaptiveLangevin(D, target_log_pdf, surrogate, step_size)
return instance
def get_OracleKameleon_instance(D, target_log_pdf):
step_size = 30.
schedule = one_over_sqrt_t_schedule
acc_star = 0.234
gamma2 = 0.1
n = 500
Z = sample_banana(N=n, D=D, bananicity=0.03, V=100)
kernel_sigma = 1. / gamma_median_heuristic(Z)
instance = OracleKameleon(D, target_log_pdf, n, kernel_sigma, step_size, gamma2, schedule, acc_star)
instance.set_batch(Z)
return instance
def get_OracleKernelAdaptiveLangevin_instance(D, target_log_pdf, grad):
step_size = 1.
schedule = one_over_sqrt_t_schedule
acc_star = 0.574
N = 500
m = 500
Z = sample_banana(N=N, D=D, bananicity=0.03, V=100)
surrogate = KernelExpFiniteGaussian(sigma=10, lmbda=1., m=m, D=D)
surrogate.fit(Z)
instance = OracleKernelAdaptiveLangevin(D, target_log_pdf, surrogate, step_size, schedule, acc_star)
return instance
V = 100
true_mean = np.zeros(D)
true_var = np.ones(D)
true_var[0] = 100
true_var[1] = 20
true_cov = np.diag(true_var)
num_iter_per_particle = 200
population_sizes = [5, 10, 25, 50, 100]
num_repetitions = 30
num_benchmark_samples = 1000
rng_state = np.random.get_state()
np.random.seed(0)
benchmark_sample = sample_banana(num_benchmark_samples, D, bananicity, V)
np.random.set_state(rng_state)
for _ in range(num_repetitions):
for population_size in population_sizes:
num_iter = population_size * num_iter_per_particle
start = np.zeros(D)
target_log_pdf = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=False)
target_grad = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=True)
samplers = [
get_StaticMetropolis_instance(D, target_log_pdf),
get_AdaptiveMetropolis_instance(D, target_log_pdf),
get_AdaptiveIndependentMetropolis_instance(D, target_log_pdf),
get_StaticLangevin_instance(D, target_log_pdf, target_grad),
gamma2 = 0.1
instance = AdaptiveLangevin(D, target_log_pdf, grad, step_size,
one_over_4th_root_t_schedule, acc_star)
instance.do_preconditioning = prec
instance.manual_gradient_step_size = 1
return instance
if __name__ == '__main__':
Log.set_loglevel(20)
max_moment = 8
D = 10
pop_size = 10
bananicity = 0.03
V = 100
Z = sample_banana(3000, D, bananicity, V)
moments = np.array([(Z**i).mean(0) for i in range(1, max_moment)])
pk = PolynomialKernel(3)
print(moments)
true_correct = np.linalg.inv(np.cov(Z.T))
target_log_pdf = lambda x: log_banana_pdf(
x, bananicity, V, compute_grad=False)
target_grad = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=True)
samplers = [
#
]
sampler_is = get_StaticLangevin(
D, target_log_pdf,
target_grad) #get_AdaptiveLangevin(D, target_log_pdf, target_grad)
V = 100
true_mean = np.zeros(D)
true_var = np.ones(D)
true_var[0] = 100
true_var[1] = 20
true_cov = np.diag(true_var)
num_iter_per_particle = 200
population_sizes = [5, 10, 25, 50, 100]
num_repetitions = 30
num_benchmark_samples = 1000
rng_state = np.random.get_state()
np.random.seed(0)
benchmark_sample = sample_banana(num_benchmark_samples, D, bananicity, V)
np.random.set_state(rng_state)
for _ in range(num_repetitions):
for population_size in population_sizes:
num_iter = population_size * num_iter_per_particle
start = np.zeros(D)
target_log_pdf = lambda x: log_banana_pdf(
x, bananicity, V, compute_grad=False)
target_grad = lambda x: log_banana_pdf(
x, bananicity, V, compute_grad=True)
samplers = [
get_StaticMetropolis_instance(D, target_log_pdf),
get_AdaptiveMetropolis_instance(D, target_log_pdf),
step_size = 5.
acc_star = 0.234
gamma2 = 0.1
instance = AdaptiveMetropolis(D, target_log_pdf, step_size, gamma2, one_over_4th_root_t_schedule, acc_star)
return instance
if __name__ == '__main__':
Log.set_loglevel(20)
D = 2
pop_size=10
bananicity = 0.03
V = 100
Z = sample_banana(700, D, bananicity, V)
moments = np.array([(Z**i).mean(0) for i in range(1,4)])
target_log_pdf = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=False)
target_grad = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=True)
samplers = [
# get_StaticMetropolis_instance(D, target_log_pdf),
# get_AdaptiveMetropolis_instance(D, target_log_pdf),
# get_OracleKameleon_instance(D, target_log_pdf),
# get_Kameleon_instance(D, target_log_pdf),
# get_StaticLangevin_instance(D, target_log_pdf, target_grad),
get_AM_5(D, target_log_pdf),
get_AM_1(D, target_log_pdf),
get_AM_2(D, target_log_pdf),
get_AM_05(D, target_log_pdf),
]
from old import KameleonRKSGaussian.KameleonRKSGaussian from kameleon_rks.densities.banana import sample_banana from kameleon_rks.gaussian_rks import sample_basis, gamma_median_heuristic import matplotlib.pyplot as plt import numpy as np np.random.seed(0) # fix RKS basis D = 2 m = 500 kernel_gamma = gamma_median_heuristic(sample_banana(N=1000, D=D)) kernel_gamma = 0.5 print "Using kernel_gamma=%.2f" % kernel_gamma omega, u = sample_basis(D, m, kernel_gamma) # storing all oracle samples fed to Kameleon Z_all = [] # Kameleon parameters eta2 = 300 gamma2 = 0.1 # Schudule for adaptation, toy problem: always update schedule = lambda t: 1. # sampler instance kameleon_rks = KameleonRKSGaussian(D, kernel_gamma, m, gamma2, eta2, schedule) kameleon_rks._initialise()
feature_map_single, feature_map_grad_single import matplotlib.pyplot as plt import numpy as np np.random.seed(0) # fix basis for now D = 2 m = 1000 gamma = .3 omega, u = sample_basis(D, m, gamma) # sample points in input space N = 2000 Z = sample_banana(N, D) # fit Gaussian in feature space Phi = feature_map(Z, omega, u) # mean and covariance, batch version mu = np.mean(Phi, 0) eta = 0.01 C = np.cov(Phi.T) + eta ** 2 * np.eye(m) L = np.linalg.cholesky(C) # step size eta = 50. plt.plot(Z[:, 0], Z[:, 1], 'bx')
acc_star = 0.574
gamma2 = 0.1
instance = AdaptiveLangevin(D, target_log_pdf, grad, step_size, one_over_4th_root_t_schedule, acc_star)
instance.do_preconditioning = prec
instance.manual_gradient_step_size = 1
return instance
if __name__ == '__main__':
Log.set_loglevel(20)
max_moment = 8
D = 10
pop_size=10
bananicity = 0.03
V = 100
Z = sample_banana(3000, D, bananicity, V)
moments = np.array([(Z**i).mean(0) for i in range(1, max_moment)])
pk = PolynomialKernel(3)
print(moments)
true_correct = np.linalg.inv(np.cov(Z.T))
target_log_pdf = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=False)
target_grad = lambda x: log_banana_pdf(x, bananicity, V, compute_grad=True)
samplers = [
#
]
sampler_is = get_StaticLangevin(D, target_log_pdf, target_grad)#get_AdaptiveLangevin(D, target_log_pdf, target_grad)
sampler_mh = get_StaticLangevin(D, target_log_pdf, target_grad)#get_AdaptiveLangevin(D, target_log_pdf, target_grad, prec=True, step_size=1.)
start = np.zeros(D)
