Custom Loss Functions for RL

[Sharad24]

We should think about common loss functions that are used a lot in RL that can be packaged. As of now, we're constructing everything from scratch so we're going towards implementations.

Check this: https://github.com/tensorforce/tensorforce/tree/master/tensorforce/core/objectives

This does not have a lot of them though

[Het-Shah]

Yea I agree we should have loss functions of our own. Maybe make a checklist for the same here :P

[Sharad24]

I'm out of ideas here. If anyone has any idea to add something useful here, go ahead

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