Replaced part 2 with latest from dmatrix

[dmatrix]

Replaced with improvements from the latest at dmatrix

• [x] improvements to the existing notebook
• [x] notebook is without outputs
• [x] empty cells are removed

[dmatrix]

@kamil-kaczmarek this is a bit strange. GitHub action Runner is failing to access scikit-learn's California housing file. Have you seen this?

[kamil-kaczmarek]

@kamil-kaczmarek this is a bit strange. GitHub action Runner is failing to access scikit-learn's California housing file. Have you seen this?

Error is fixed now.

It was because you read/write dataset from many actors. To fix it, I moved dataset ops to globals.