Reorg modules and change voting ensemble calibration

[Adeemy]

The changes include the following:

• Reorgnized modules and revised paths.
• Renamed model loader class.
• Added predict.py to inference.
• Changed voting ensemble calibration.
• Updated documentation.

Checklist

[x] Review code and fix any errors or typos
[x] Build and test your code locally
[x] Update the documentation