Can't stick strings into a `pm.Data` container

[michaelosthege]

Description of your problem

with pm.Model():
    pm.ConstantData("dnames", ["A", "B"])

gives

TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

This is related to the automatic masking/imputation that we tried to remove in #6189.

Versions and main components

• PyMC/PyMC3 Version: 4.2.2

[ricardoV94]

Aesara does not currently support string arrays, so it would fail even without the check for nan.

import aesara.tensor as at
at.as_tensor_variable(["A", "B"])   # Or `aesara.as_symbolic(...)`
# TypeError: Unsupported dtype for TensorType: str32