Heterogeneous Acceleration Pipeline for Recommendation System Training

Recommendation models rely on deep learning networks and large embedding tables, resulting in computationally and memory-intensive processes. These models are typically trained using hybrid CPU-GPU or GPU-only configurations. The hybrid mode combines the GPU’s neural network acceleration with the CPUs’ memory storage and supply for embedding tables but may incur significant CPU-to-GPU transfer time. In contrast, the GPU-only mode utilizes High Bandwidth Memory (HBM) across multiple GPUs for storing embedding tables. However, this approach is expensive and presents scaling concerns. This paper introduces Hotline, a heterogeneous acceleration pipeline that addresses these concerns. Hotline develops a dataaware and model-aware scheduling pipeline by leveraging the insight that only a few embedding entries are frequently accessed (popular). This approach utilizes CPU main memory for nonpopular embeddings and GPUs’ HBM for popular embeddings. To achieve this, Hotline accelerator fragments a mini-batch into popular and non-popular micro-batches ($\mu$-batches). It gathers the necessary working parameters for non-popular $\mu$-batches from the CPU, while GPUs execute popular $\mu$-batches. The hardware accelerator dynamically coordinates the execution of popular embeddings on GPUs and non-popular embeddings from the CPU’s main memory. Real-world datasets and models confirm Hotline’s effectiveness, reducing average end-to-end training time by $2.2 \times$ compared to Intel-optimized CPU-GPU DLRM baseline.