I am using Action Center in unattended mode
After validation of the extraction we are passing it to Train Extractors
How the ML Skill gets trained ?
We are also selecting Project Name and Dataset !!
In the backend it automatically send the validated data for retraining if you have selected the option for Retraining
You are using Machine learning extractor trainer activity right, after mapping the data in the action center the data will be store in the output of Wait for document validation action and resume activity that data will pass to the machine learning trainer.
You gives the ML Skill and end point to the Machine learning extractor by using those api it trains the ML Model in the background.
Hope it helps!!