mixture

Finite weighted mixture transformation for probability distributions.

class pysatl_core.transformations.operations.distributions.mixture.FiniteMixtureDistribution(weighted_components, *, methods=None, sampling_strategy=None, computation_strategy=None)[source]

Bases: DerivedDistribution

Distribution obtained as a finite weighted mixture of components.

Parameters:

  • weighted_components (Sequence[tuple[float, pysatl_core.distributions.distribution.Distribution]]) – Ordered pairs (weight, distribution). Weights must be finite, non-negative and sum to one.

  • methods (Mapping[str, Mapping[str, GenericAlias[Any, Any]]] | None) – Transformation methods for building derived characteristics. When None, built-in methods are used.

  • sampling_strategy (Optional[pysatl_core.distributions.strategies.SamplingStrategy]) – Sampling strategy exposed by the transformed distribution.

  • computation_strategy (Optional[pysatl_core.distributions.strategies.ComputationStrategy]) – Computation strategy exposed by the transformed distribution.

__init__(weighted_components, *, methods=None, sampling_strategy=None, computation_strategy=None)[source]
Parameters:

  • weighted_components (Sequence[tuple[float, TypeAliasForwardRef('pysatl_core.distributions.distribution.Distribution')]])

  • methods (TransformationMethodSpecsMap | None)

  • sampling_strategy (MyTypeAliasForwardRef('pysatl_core.distributions.strategies.SamplingStrategy') | None)

  • computation_strategy (MyTypeAliasForwardRef('pysatl_core.distributions.strategies.ComputationStrategy') | None)

Return type:

None

property components: tuple[LightweightDistribution, ...]

Get the lightweight component snapshots.

property parent_roles: tuple[ParentRole, ...]

Return ordered component roles used by this finite mixture.

property weights: NumericArray

Get validated component weights.

sample(n, **options)[source]

Generate mixture samples by sampling selected components.

Return type:

GenericAlias[floating[Any] | integer[Any]]

Parameters:
pysatl_core.transformations.operations.distributions.mixture.discrete_mixture(weighted_components, *, methods=None)[source]

Build a finite mixture with a discrete set of component weights.

This is an alias of finite_mixture().

Return type:

FiniteMixtureDistribution

Parameters:
pysatl_core.transformations.operations.distributions.mixture.finite_mixture(weighted_components, *, methods=None)[source]

Build a finite weighted mixture distribution.

Return type:

FiniteMixtureDistribution

Parameters: