Fix Verifai Sampler with more than 10 objects

[tcdanielh]

Description

Fixes problem with VerifaiSampler where there may be strange behavior when there are more than 10 samples in the scene. The problem is similar to the problem that was fixed recently in the VerifAI repo. The enumeration of objects goes as follows if there are more than 10 objects: 0, 1, 10, 2, 3, …, 9 when it expects 0, 1, 2, 3, …, 10 which causes a mismatch. This PR should fix this issue by checking that the parameter names match.

This issue might pop up for other external samplers as well, but VerifaiSampler is fixed at least.

Issue Link

#276

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

N/A

[dfremont]

Thanks for fixing this, Daniel! I'll add a test for this in a new PR (I can't easily add it to this one).