New notebook for Hmix multi-temp data

Merged Choi, Jong Youl requested to merge jong_hmix_1200C into master

This is to include notebooks to process multi-temp Hmix data: Compositions+effective_elemental_properties_Hmix_800C+1100C+1200C.xlsx

Compared with the notebooks in Hmix_800C, this version contains the following:

  • Training set selection based on non-linear and linear unary /binary (check-elemental.ipynb)
  • Fix on train/validation error calculation (train.ipynb)

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