Boomtrain *boomtrain = [Boomtrain sharedInstance];
boomtrain.delegate = self;
[boomtrain getRecommendations:@[@"model1", @"model2"] count:5];
- (void) getRecommendationsCompleted:(RecommendationResult *)result {
}
- (void) getRecommendationsFailed:(NSError *)error {
}