Fix eval_config field - eval_interval_secs not working

[bleqdyce]

I think eval_interval_secs is originally designed to be passed as one of EvalSpec parameter - throttle_secs, which defines the frequency of saving checkpoint and evaluation.
Because setting eval_interval_secs is not working, there is no other way to change the frequency of evaluation.
Therefore, I simply parse eval_interval_secs from eval config and pass it to EvalSpec as a parameters to complete this functionality.

[ruifm]

This is a must have imo. Please merge it!

[pkulzc]

Could you please resolve the conflicts ?

[thusinh1969]

Gents,

Have this been fixed and applied fully in latest tensorflow object detection repo so we can re-download it ? This is killing us...

Thanks,
Steve

[kkulczak]

Any progress with the issue?

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[bleqdyce]

@googlebot I consent.

[piercus]

@googlebot I consent.

[googlebot]

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[jaeyounkim]

@pkulzc Please review this pull request.

[Mathieu4141]

Hi !
Is there a reason why this is not yet merged ?