def set_dim(self, dimension=None):
r"""
TODO: Add this.
"""
if self.dim is None:
if dimension is not None:
self.dim = int(abs(dimension))
else:
self.dim = 1 # default option is self.dim not yet set.
elif self.dim is not None:
if dimension is not None:
self.dim = int(abs(dimension))
# otherwise, if nothing specified, leave it alone.
else:
assert TypeError("Please specify an integer-valued `dimension` greater than zero.")
self.dist = distributions.parametric_dist(self.dim)
pass
def __init__(self, input_set=None, output_set=None, seed=None):
self.input = input_set
self.output = output_set
self.model = None
self.prior_dist = self.input.dist
self.pushforward_dist = self.output.dist # kde object. should have rvs functionality. TODO: double check sizing with test.
self.posterior_dist = None # this will be the dictionary object which we can use with .rvs(num_samples)
if self.output.dim is not None:
self.observed_dist = distributions.parametric_dist(self.output.dim)
else:
self.observed_dist = None
self.accept_inds = None # indices into input_sample_set object associated with accepted samples from accept/reject
self.ratio = None # the ratio is the posterior density evaluated on the `input_set.samples`
self.pf_pr_eval = None
if seed is None:
self.seed = 12112
else:
self.seed = seed
def generate_sample_set_from_dict(U, num_samples=1, seed=None):
r"""
This module takes a nested dictionary (one inside another)
which contains the description of the distribution in that parameter
and generates the samples described therein and generates a sample set.
Descriptions of each parameter name are in `sample_set.dist.names`, which
describes the keys in the outer dictionary, and `sample_set.dist.vars`,
which descirbes the inner layers (assumed to match).
:returns: samples ordered by columns, `sample_set.dist.params` contains the ordering as strings
:returns: :class:`~np.array`
"""
unit_names = list(U.keys())
try:
assert (len(np.unique([len(U[n].keys()) for n in unit_names])) == 1)
except AssertionError:
print(
'Something is amiss in your dictionary. Perhaps extra or missing variables.'
)
unit_variables = list(U[unit_names[0]].keys())
# print(unit_variables) # the order appears to be preserved.
dim = len(unit_variables) * len(unit_names)
P = distributions.parametric_dist(dim)
# both of these attributes will now belong to the sample set.
param_names = []
di = 0
for n in unit_names:
for v in unit_variables:
P.set_dist(dim=di, **U[n][v])
param_names.append(v + '-' + n) # FORMATTING FOR NAMES
di += 1
P.names = unit_names
P.vars = unit_variables
P.params = param_names
S = sample_set((num_samples, dim))
S.dist = P
S.generate_samples(seed=seed)
return S
def __init__(self, size=(None, None), seed=121):
r"""
Initialization
:param size: Dimension of the space in which these samples reside.
:type size: :class:`numpy.ndarray` of sample values of shape (num, dim)
:param int seed: random number generator seed
"""
# tuple `size` should be of format (num_samples, dim).
# Will write these attributes to class `sample_set`
# If `size` is given as an integer, it is inferred to be dimension.
if type(size) is tuple:
self.num_samples = size[0]
if len(size) == 1:
self.dim = 1
else:
self.dim = size[1] # dimension
elif type(size) is int:
self.dim = size
self.num_samples = None # used as a default.
# will infer/set `num_samples` from call to `generate_samples`
else:
logging.warning(
" Please specify a valid size parameter. Defaulting to None."
)
self.dim = None
self.num_samples = None
#: dist TODO description
if self.dim != None:
self.dist = distributions.parametric_dist(self.dim)
else:
self.dist = None
#: :class:`numpy.ndarray` of samples of shape (num, dim)
self.samples = None # this holds the actual samples we generate.
#: :param int seed: random number generator seed
self.seed = seed
