Add initial distribution parameter types

Author: canyon289

pymc/distributions/continuous.py

@@ -583,6 +583,9 @@ def logcdf(value, mu, sigma):
         )
 
 
+from pymc.distributions.distribution import DIST_PARAMETER_TYPES
+
+
 class TruncatedNormalRV(RandomVariable):
     name = "truncated_normal"
     ndim_supp = 0
@@ -594,7 +597,7 @@ class TruncatedNormalRV(RandomVariable):
     def rng_fn(
         cls,
         rng: np.random.RandomState,
-        mu: Union[np.ndarray, float],
+        mu: DIST_PARAMETER_TYPES,
         sigma: Union[np.ndarray, float],
         lower: Union[np.ndarray, float],
         upper: Union[np.ndarray, float],

pymc/distributions/distribution.py

@@ -19,9 +19,10 @@
 
 from abc import ABCMeta
 from functools import singledispatch
-from typing import Callable, Optional, Sequence
+from typing import Callable, Optional, Sequence, Union
 
 import aesara
+import numpy as np
 
 from aeppl.logprob import _logcdf, _logprob
 from aesara import tensor as at
@@ -56,6 +57,8 @@
     "NoDistribution",
 ]
 
+DIST_PARAMETER_TYPES = Union[np.ndarray, int, float, TensorVariable]
+
 vectorized_ppc = contextvars.ContextVar(
     "vectorized_ppc", default=None
 )  # type: contextvars.ContextVar[Optional[Callable]]