Benchmark test for expt_is_metal

[jae3goals]

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[ardunn]

Hi @jae3goals !

Thanks for the contribution, but it looks like something is going on with the keys in some of the data?

[sgbaird]

Logs expired. Can someone trigger the tests again?

[sgbaird]

@jae3goals taking a look at the notebook, I'm guessing the issue is with the Magpie featurization csv files that you included. Do you have the code for how those csv files were produced?