Refine API

[YujiOshima]

Related #72 #66 #68

• Add low-level API and refine APIs
• Split Trial to Worker(an instance of evaluating processes) and Trial (a parameter set).
• Migrate dkl worker to kubernetes worker.
• Save suggestion and Early stopping configs to DB
• Add MinikubeDemo

HyperBand and Bayes optimization suggestion are not supported in this PR.
Random and Grid Support for now.

@gaocegege
@ddysher

Signed-off-by: YujiOshima yuji.oshima0x3fd@gmail.com

[gaocegege]

🎉 Thanks for your contribution

It is a little monolithic, I will reivew it ASAP

[gaocegege]

/assign @gaocegege @ddysher

[gaocegege]

Generally LGTM, I will have a try on it.

BTW, @ddysher had a talk on KubeCon and I think he may have no time these days.

[YujiOshima]

@gaocegege Thank you!
OK, we can wait for his review,
And I'm going to address @libbyandhelen 's comments.

[gaocegege]

Hi @YujiOshima

ddysher may be busy, I think. And we could merge it and go ahead if you think it blocks your work.

[YujiOshima]

@gaocegege Thanks. Yes, This block some work.
I will push a new commit applied @libbyandhelen 's comments soon.
Then please review.

[gaocegege]

👌

[YujiOshima]

I update

• You can get worker_ids from study ID, trial ID or worker ID.
• You can get suggestion/earlystopping parameter list from study ID.
• Trials are created in suggestion service.

@gaocegege PTAL

[gaocegege]

Cool I will take a look.

[YujiOshima]

/retest

[gaocegege]

/retest

[YujiOshima]

Is the test working? 🤔

[YujiOshima]

@gaocegege @jlewi I'm not sure why the test goes time-out. Do you have any ideas?

[ddysher]

Thanks! Generally LGTM 👍

[gaocegege]

/retest

[gaocegege]

/retest

[gaocegege]

/lgtm

[gaocegege]

Is it ready to merge?

[YujiOshima]

Yes, we can merge this!

[gaocegege]

/approve

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