Patch for case when Y is a TensorVariable (#206)

* add case tensor var for Y

* Improve `isinstance` statement

Co-authored-by: Osvaldo A Martin <aloctavodia@gmail.com>

---------

Co-authored-by: Osvaldo A Martin <aloctavodia@gmail.com>

pymc_bart/bart.py

@@ -26,6 +26,7 @@
 from pymc.logprob.abstract import _logprob
 from pytensor.tensor.random.op import RandomVariable
 from pytensor.tensor.sharedvar import TensorSharedVariable
+from pytensor.tensor.variable import TensorVariable
 
 from .split_rules import SplitRule
 from .tree import Tree
@@ -54,7 +55,7 @@ def rng_fn(  # pylint: disable=W0237
         if not size:
             size = None
 
-        if isinstance(cls.Y, TensorSharedVariable):
+        if isinstance(cls.Y, (TensorSharedVariable, TensorVariable)):
             Y = cls.Y.eval()
         else:
             Y = cls.Y