fix bug global MIN_TRAIN_CLASS_COUNT not updated
fix bug global MIN_TRAIN_CLASS_COUNT not updated

Variable MIN_TRAIN_CLASS_COUNT was missing 'global' keyword, hence it was always being taken as =100 (default) in the training.
aidendoherty/biobankAccelerometerAnalysis,aidendoherty/biobankAccelerometerAnalysis,computationalEpidemiology/biobankAccelerometerAnalysis,computationalEpidemiology/biobankAccelerometerAnalysis