Fix code for Cookbook 11.3

[matthewedwarddavidson]

The example in part 11.3 did not work for me, it was zipmapping column headers to :size, :indices, :values of feature-importances. There was also an extra closing bracket on the end, maybe for a missing bit of code? The suggested change does what, I think, the example was meant to show.

[skylee03]

Thanks for pointing this out!

Indeed, our desired result is:

{"housing-median-age" 0.060262475752573055,
 "median-income" 0.7847621702619059,
 "bedrooms-per-house" 0.010547166447551434,
 "population-per-house" 0.14442818753796965}

But the actual result is:

{"housing-median-age" [:size 4],
 "median-income" [:indices (0 1 2 3)],
 "bedrooms-per-house" [:values (0.060262475752573055 0.7847621702619059 0.010547166447551434 0.14442818753796965)]}

Your patch solves this problem.

---

As for the extra right bracket, I think it was caused by copying the code directly from cookbook-11.clj when writing the docs.

[codecov-commenter]

Codecov Report

Merging #343 (62ea3ad) into develop (b0a8b6b) will not change coverage. The diff coverage is n/a.

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Additional details and impacted files

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