Refactor Training Loop into a Class

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Description

This pull request refactors the training loop in the main.py file into a class called Trainer. It also updates the api.py file to use the Trainer class for loading and training the model. Additionally, it reorganizes the imports in both files for better readability.

Summary

• Refactored the training loop in main.py into a Trainer class
• Updated api.py to use the Trainer class for loading and training the model
• Reorganized imports in both files for better readability

Fixes #6.

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