Use separate argument in CustomDist
for functions that return symbolic representations
#6462
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The initial API introduced in #6361 of overloading the
random
kwarg and branching depending on whether the function returned PyTensor variables or failed whatsoever was pretty bad. For instance it would mask obvious errors like callingpm.Normal.dist(banana=...)
.Such errors won't be masked anymore, and the user must instead pass such functions to the
dist
kwarg. I added a temporary check to help users navigate the API change.It also cleans some stale references to Aesara