One-hot encoding as a new alteration

[Seddryck]

This alteration is taking the values from a column and is creating a new column for each distinct value found in this column. The value of the newly created columns are set to 0 except for the column matching with the initial column (which is removed). The name of the newly created column is based on the initial name of the column followed by an underscore and the name of the value.

Name	Country
John Doe	US
Jean Dupont	France
Jacques Martin	France
Bill Smith	US
Mario Rossi	Italy
Ashok Kumar	India

is transfromed into

Name	Country_US	Country_France	Country_Italy	Country_India
John Doe	1	0	0	0
Jean Dupont	0	1	0	0
Jacques Martin	0	1	0	0
Bill Smith	1	0	0	0
Mario Rossi	0	0	1	0
Ashok Kumar	0	0	0	1