...
The legacy Recommender is supported in Totara 15 and will continue to be fully functional when Totara 13 or 14 is upgraded to Totara 15. Totara recommends upgrading to the new Machine Learning Service as the legacy Recommender has been deprecated in Totara 17, and will be removed in Totara 1819.
This step is required only if you are using the legacy Recommender on Totara 13 or 14 and want to use the Recommender with the new ML Service.
...
The Machine Learning Service can be installed and run in a Docker container, Linux (with supervisor or without), or Windows. The installation and configuration instructions on different platforms are included in integration/extensions/ml_service/README.md
.
...
The ML Service will fetch the data cached by this task on regular intervals. The default frequency with which the ML Service fetches the data and upgrades the recommendation model is once every 24 hours. This can be modified by following the instructions in the file: integration/extensions/ml_service/README.md
...