I reshaped my data to 4D (9x2000x10x20000) i.e height x width x channel x instances. and label 20000x1. As my matlab is not able to processed these 20000 at a time so i took first 1000 instances and evaluated my CNN model with 70:30 holdout. but i am only getting 20% caccuracy. and model is overfitting. Model is predicting on one class for all available classes. Data is unbalenced also.