A method for predicting reactiveness of MMI users comprises: reacting to a message with a mobile user device which is a receiver of the message, collecting ground-truth data (11) for a machine-learning classifier, extracting from the collected ground-truth data (11) a list of features (12) which determines a current or past context of the user, and each feature having a feature's prediction strength calculated as fraction of classes misclassified when removing the feature; selecting the list of features (12) based on each feature's prediction strength; defining a plurality of reactiveness classes (101); both the extracted list of features (12) and the reactiveness classes (101) being input to the machine-learning classifier; classifying (102) the user according to the defined reactiveness classes (101); predicting the user's reactiveness for the given current or past context of the user by determining the most likely reactiveness class via the machine-learning classifier.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method for predicting reactiveness of users of mobile devices for messaging, the method comprising: reacting to a message by a user with a mobile user device which is a receiver of the message, and being characterized by further comprising: collecting ground-truth data (11) for a machine-learning classifier, extracting a list of features (12) from the collected ground-truth data (11), the list of features (12) determining a current or past context of the user, and each feature having a feature's prediction strength calculated as a fraction of classes misclassified by the machine-learning classifier when removing the feature from the list of features (12); selecting the list of features (12) based on each feature's prediction strength; defining a plurality of reactiveness classes (101); both the extracted list of features (12) and the reactiveness classes (101) being input to the machine-learning classifier; classifying (102) the user by the machine-learning classifier in accordance with the defined reactiveness classes (101); predicting the user's reactiveness for the given current or past context of the user by determining the most likely reactiveness class via the machine-learning classifier. 2. The method according to claim 1, further comprising: ranking (13) features by their prediction strength to obtain a final selection of features (14), classifying (102) the user by the machine-learning classifier in accordance with the defined reactiveness classes (101) and using the final selection of features (14). 3. The method according to claim 2, further comprising: creating a model to compute accuracy and precision in classifying the user in accordance with a specific class of the defined reactiveness classes (101), updating the final selection of features (14) by adding a selected feature from the ranking (13) to the final selection of features (14) only if the accuracy and precision computed by the model using the selected feature are higher than the accuracy and precision computed using the final selection of features (14) before adding the selected feature. 4. The method according to claim 2, further comprising: assigning a penalty cost (103) to penalize the classifying (102) of the user in accordance with a specific class of the defined reactiveness classes (101). 5. The method according to claim 2, further comprising providing a sender user which is a sender of the message from a mobile device with the classifying (102) of the user reacting to the message. 6. The method according to claim 5, wherein the machine-learning classifier is integrated in a user interface (230) of the sender user's mobile device. 7. The method according to claim 5, wherein the machine-learning classifier is in a server (220) communicated with the sender user's mobile device. 8. The method according to claim 1, wherein the machine-learning classifier is integrated in a prediction engine (210) of the mobile user device. 9. The method according to claim 1, wherein the machine-learning classifier is Random Forest. 10. The method according to claim 1, wherein the extracted initial list of features (12) comprises: type of messaging application in the mobile user device opening and closing times of the application, arrival time of the message, elapsed time between the arrival time and the time of reading the message, time at which the screen of the mobile user device is turned on or turned off, time when the screen of the mobile user device is covered or uncovered, ringing status of the mobile user device. 11. The method according to claim 1, wherein reacting to a message by the user comprises requesting from a notification center (215) a list of unread messages by the user. 12. The method according to claim 1, wherein reacting to a message by the user comprises opening a message reader application in the mobile user device. 13. The method according to claim 1, wherein the ground truth data comprises a type of messaging application selected from SMS, WhatsApp, Google Hangout, and messaging applications generating email and social network updates. 14. A computer program product comprising program code means which, when loaded into processing means of a computer, a digital signal processor, a field-programmable gate array, an application-specific integrated circuit, a micro-processor, a micro-controller, or any other form of programmable hardware, make said program code means execute the method according to claim 1.