Loss Operations: Adds hinge loss

[manrajgrover]

This PR adds hinge loss to core api.

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This change is 

[dsmilkov]

Nice! One comment and we are good to go

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Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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src/ops/loss_ops.ts, line 130 at r1 (raw file):

        labels.shape, predictions.shape, 'Error in hingeLoss: ');

    const ones = ops.onesLike(labels);

to save memory and take advantage of broadcasting, make ones be a single scalar const ones = ops.scalar(1);

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Comments from Reviewable

[manrajgrover]

@dsmilkov The build failed because of some issue. Could you please restart the build?

[tafsiri]

@manrajgrover I just restarted the integration build

[dsmilkov]

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Reviewed 3 of 3 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable