1 INTRODUCTION  
1.1 RESEARCH GAP AND OBJECTIVE  
1.2 RESEARCH METHODOLOGY  
1.3 ORGANIZATION OF THE PAPER  
2 BACKGROUND  
2.1 RECOMMENDER SYSTEM CHALLENGES  
2.2 TAXONOMY OF DEEP LEARNING METHODS  
3 PROPOSED TAXONOMY OF DEEP LEARNING TECHNIQUES TO ADDRESS COLD START AND IMBALANCE  
4 OPPORTUNITIES  
4.1 RESEARCH OPPORTUNITIES  
5 CONCLUSION