Hi Ed,
The error indicates that the “tensorflow custom op” (i.e. the compiled c++ code that runs the model) is not loaded in memory.
The (Open Sourced) TFX evaluator 1 is a simple python script. Therefore, I suspect that importing tf-df in the evaluator could solve the issue.
Can you try to add the line import tensorflow_decision_forests at the top of your evaluator python script? For example, right after the import tensorflow_model_analysis as tfma.
Cheers,
M.