physbo.blm.core.model module

class physbo.blm.core.model.model(lik, prior, options={})[source]

Bases: object

Baysean Linear Model

prior

prior distribution of weights

Type: physbo.blm.prior.gauss

lik

kernel

Type: physbo.blm.lik.gauss

nbasis

number of features in random feature map

Type: int

stats

auxially parameters for sampling

Type: Tuple

method

sampling method

Type: str

get_post_fcov(X, Psi=None, diag=True)[source]

calculates posterior covariance of model

Parameters

X (numpy.ndarray) – inputs
Psi (numpy.ndarray) – feature maps (default: blm.lik.linear.basis.get_basis(X))
diag (bool) – if True, returns only variances as a diagonal matrix (default: True)

Return type

numpy.ndarray

See also

physbo.blm.inf.exact.get_post_fcov

get_post_fmean(X, Psi=None, w=None)[source]

calculates posterior mean of model (function)

Parameters

X (numpy.ndarray) – inputs
Psi (numpy.ndarray) – feature maps
w (numpy.ndarray) – weight

See also

physbo.blm.inf.exact.get_post_fmean

get_post_params_mean()[source]

calculates posterior mean of weights

Return type: numpy.ndarray

post_sampling(Xtest, Psi=None, N=1, alpha=1.0)[source]

draws samples of mean value of model

Parameters

Xtest (numpy.ndarray) – inputs
Psi (numpy.ndarray) – feature maps (default: blm.lik.get_basis(Xtest))
N (int) – number of samples (default: 1)
alpha (float) – noise for sampling source

Return type

numpy.ndarray

predict_sampling(Xtest, Psi=None, N=1)[source]

draws samples from model

Parameters

Xtest (numpy.ndarray) – inputs
Psi (numpy.ndarray) – feature map (default: blm.lik.get_basis(Xtest))
N (int) – number of samples (default: 1)

Return type

numpy.ndarray

prepare(X, t, Psi=None)[source]

initializes model by using the first training dataset

Parameters

X (numpy.ndarray) – inputs
t (numpy.ndarray) – target (label)
Psi (numpy.ndarray) – feature maps

See also

physbo.blm.inf.exact.prepare

sampling(w_mu=None, N=1, alpha=1.0)[source]

draws samples of weights

Parameters

blm (physbo.blm.core.model) – model
w_mu (numpy.ndarray) – mean of weight
N (int) – the number of samples (default: 1)
alpha (float) – noise for sampling source (default: 1.0)

Returns

samples of weights

Return type

numpy.ndarray

See also

physbo.blm.inf.exact.sampling

update_stats(x, t, psi=None)[source]

updates model by using another training data

Parameters

x (numpy.ndarray) – input
t (float) – target (label)
psi (numpy.ndarray) – feature map

See also

physbo.blm.inf.exact.update_stats