Scripts for producing the figures that explain the bucketing strategy

[sxjscience]

Here's the script I used to plot the figures that explain different bucketing strategies (The figures in http://gluon-nlp.mxnet.io/api/notes/data_api.html). I choose to upload it here in case the others would like to use it in the future.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request head (plot_bucket@f7d0285). Click here to learn what that means.
The diff coverage is n/a.

[codecov]

Codecov Report

Merging #908 into master will not change coverage.
The diff coverage is n/a.

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[sxjscience]

For the color combinations, I manually selected from https://coolors.co/ .

[mli]

Job PR-908/1 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-908/1/index.html

[leezu]

Great! There's a typo in the filename though. Can you rename it?

[mli]

Job PR-908/4 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-908/4/index.html

[eric-haibin-lin]

Nice. If we can take a BucketSampler as the input and output the visualization, it will be even easier for other to use.