Integration into main script

[ramanuzan]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

Scripts managed as single_train.py, sync_distributed_train.py, async_distributed_train.py and eval.py are being managed as one main.py script.