Amazon SageMaker now supports ml.p3dn.24xlarge, the most powerful P3 instance optimized for machine learning applications. This instance provides faster networking, which helps remove data transfer bottlenecks and optimizes the utilization of GPUs to deliver maximum performance for training deep learning models.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/introducing-amazon-sagemaker-mlp3dn24xlarge-instances/