Implementation details get exposed to user

[zhanyuanucb]

In the example, some implementation details (e.g. operator/task instance vs definition) are exposed to users. This is partly because the current implementation uses component names as their unique identifier. And so users need to manually manage the component name to make sure they are unique.

pirlib/example/example.py

Line 75 in b2d8cc9

translate_1 = translate.instance("translate_1")