Added CosFace Loss

[crsdvaibhav]

@monatis This is still work in progress. Just wanted to ask few questions, by sharing the code.

• Is the implementation of the Multi Objective Loss according to your demands? If it is not, can you give a few pointers in the correct direction, and also about the tests?
• CosFace Loss is correct according to me, as its only difference from Arcface Loss is the subtracting of margin from the cosines instead of angles. Could you give a pointer regarding writing the tests for the Cosface and Arcface losses?

Thankyou for the help!

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[crsdvaibhav]

@KarahanS I have made the changes. Does this need some more changes before merge?

[KarahanS]

@KarahanS I have made the changes. Does this need some more changes before merge?

Thanks for the updates! I'm not one of the official contributors of this project, so let's wait for the reviews by the maintainers for merging :)

[crsdvaibhav]

@monatis I have added the CosFace Loss and its test. Could you please review it? I have also added an implementation of Multi Objective Loss, could you please review it?

[monatis]

I needed to close this. Could you please make another PR by rebasing from master and insuring that all the tests pass --because it didn't.