Timeline for What is dimensionality reduction? What is the difference between feature selection and extraction?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 15, 2019 at 13:03 | comment | added | Bob | The way I found it, for some feature extractions you can still reconstruct the original dimensions approximately. But for feature selection, there is no reconstruction, as you have removed the useless dimensions. | |
| Oct 2, 2015 at 7:26 | comment | added | Alexey Grigorev | @ragingSloth, I think the first one is definitely feature selection - and not feature engineering. While image and text processing examples indeed seem to be feature engineering | |
| Jul 4, 2014 at 4:16 | vote | accept | alvas | ||
| Jun 16, 2014 at 21:05 | comment | added | ragingSloth | Both of these fall into the category of feature engineering as they involve manually creating or selecting features. Dimensionality reduction typically involves a change of basis or some other mathematical re-representation of the data | |
| May 31, 2014 at 8:37 | vote | accept | alvas | ||
| May 31, 2014 at 8:37 | |||||
| May 18, 2014 at 7:53 | history | answered | damienfrancois | CC BY-SA 3.0 |