Three Challenges in ReRAM-Based Process-In-Memory for Neural Network

Artificial intelligence (AI) has been successfully applied to various fields of natural science. One of the biggest challenges in AI acceleration is the performance and energy bottleneck caused by the limited capacity and bandwidth of massive data movement between memory and processing units. In the past decade, much AI accelerator work based on process-in-memory (PIM) has been studied, especially on emerging non-volatile resistive random access memory (ReRAM). In this paper, we provide a comprehensive perspective on ReRAM-based AI accelerators, including software-hardware co-design, the status of chip fabrications, researches on ReRAM non-idealities, and support for the EDA tool chain. Finally, we summarize and provide three directions for future trends: support for complex patterns of models, addressing the impact of non-idealities such as improving endurance, process perturbations, and leakage current, and addressing the lack of EDA tools.