Relocate priors (#238)

This PR moves our priors from `baybe.kernels.priors` to `baybe.priors`
since they can be used in general non-kernel contexts, for instance, as
in #231.

baybe/kernels/base.py

@@ -7,7 +7,7 @@
 
 from attrs import define
 
-from baybe.kernels.priors.base import Prior
+from baybe.priors.base import Prior
 from baybe.serialization.core import (
     converter,
     get_base_structure_hook,

baybe/kernels/basic.py

@@ -8,7 +8,7 @@
 from attrs.validators import optional as optional_v
 
 from baybe.kernels.base import Kernel
-from baybe.kernels.priors.base import Prior
+from baybe.priors.base import Prior
 from baybe.utils.conversion import fraction_to_float
 from baybe.utils.validation import finite_float
 

baybe/kernels/priors/__init__.py → baybe/priors/__init__.py

@@ -1,6 +1,6 @@
-"""Available priors."""
+"""Prior distributions."""
 
-from baybe.kernels.priors.basic import (
+from baybe.priors.basic import (
     GammaPrior,
     HalfCauchyPrior,
     HalfNormalPrior,

baybe/kernels/priors/basic.py → baybe/priors/basic.py

@@ -1,10 +1,11 @@
-"""Priors that can be used for kernels."""
+"""A collection of common prior distributions."""
+
 from typing import Any
 
 from attrs import define, field
 from attrs.validators import gt
 
-from baybe.kernels.priors.base import Prior
+from baybe.priors.base import Prior
 from baybe.utils.validation import finite_float
 
 

baybe/surrogates/gaussian_process.py

@@ -8,7 +8,7 @@
 
 from baybe.kernels import MaternKernel, ScaleKernel
 from baybe.kernels.base import Kernel
-from baybe.kernels.priors import GammaPrior
+from baybe.priors import GammaPrior
 from baybe.searchspace import SearchSpace
 from baybe.surrogates.base import Surrogate
 

tests/conftest.py

@@ -28,7 +28,6 @@
 )
 from baybe.exceptions import OptionalImportError
 from baybe.kernels import MaternKernel
-from baybe.kernels.priors import GammaPrior
 from baybe.objectives.desirability import DesirabilityObjective
 from baybe.objectives.single import SingleTargetObjective
 from baybe.parameters import (
@@ -39,6 +38,7 @@
     SubstanceEncoding,
     TaskParameter,
 )
+from baybe.priors import GammaPrior
 from baybe.recommenders.meta.base import MetaRecommender
 from baybe.recommenders.meta.sequential import (
     SequentialMetaRecommender,

tests/hypothesis_strategies/priors.py

@@ -2,7 +2,7 @@
 
 import hypothesis.strategies as st
 
-from baybe.kernels.priors import (
+from baybe.priors import (
     GammaPrior,
     HalfCauchyPrior,
     HalfNormalPrior,

tests/serialization/test_prior_serialization.py

@@ -2,7 +2,7 @@
 
 from hypothesis import given
 
-from baybe.kernels.priors.base import Prior
+from baybe.priors.base import Prior
 from tests.hypothesis_strategies.priors import priors
 
 

tests/test_iterations.py

@@ -6,7 +6,7 @@
 
 from baybe.acquisition.base import AcquisitionFunction
 from baybe.kernels import MaternKernel, ScaleKernel
-from baybe.kernels.priors import (
+from baybe.priors import (
     GammaPrior,
     HalfCauchyPrior,
     HalfNormalPrior,