Due to recent updates, all users are required to create an Altair One account to login to the RapidMiner community. Click the Register button to create your account using the same email that you have previously used to login to the RapidMiner community. This will ensure that any previously created content will be synced to your Altair One account. Once you login, you will be asked to provide a username that identifies you to other Community users. Email us at Community with questions.
Answers
RapidMiner Studio uses an abstraction layer to represent data from any source and thus create a common ground on which operators can work on. Model training usually expects a "com.rapidminer.example.ExampleSet" which is the most commonly used data format. Essentially it represents a table of data. So if you want to train most models, you probably want to create an ExampleSet and pass it to the process (containing the classifier in your case). See the FAQ for how to do this: http://rapid-i.com/rapidforum/index.php/topic,5807.msg20492.html
Regards,
Marco