[ENH] update Johnson QPDistributions with bugfixes and vectorization (cyclic-boosting ver.1.4.0)

docs/source/api_reference/distributions.rst

@@ -46,7 +46,6 @@ Non-parametric and empirical distributions
     :template: class.rst
 
     Empirical
-    QPD_U
     QPD_S
     QPD_B
 

pyproject.toml

@@ -61,7 +61,8 @@ all_extras = [
     "statsmodels>=0.12.1",
     "tabulate",
     "uncertainties",
-    "cyclic-boosting>=1.2.5; python_version < '3.12'"
+    "cyclic-boosting>=1.4.0; python_version < '3.12'",
+    "findiff"
 ]
 
 dev = [

skpro/distributions/__init__.py

@@ -1,4 +1,5 @@
 """Probability distribution objects."""
+
 # copyright: skpro developers, BSD-3-Clause License (see LICENSE file)
 # adapted from sktime
 
@@ -10,12 +11,11 @@
     "TDistribution",
     "QPD_S",
     "QPD_B",
-    "QPD_U",
 ]
 
 from skpro.distributions.empirical import Empirical
 from skpro.distributions.laplace import Laplace
 from skpro.distributions.mixture import Mixture
 from skpro.distributions.normal import Normal
-from skpro.distributions.qpd import QPD_B, QPD_S, QPD_U
+from skpro.distributions.qpd import QPD_B, QPD_S
 from skpro.distributions.t import TDistribution