Today, AWS announces the general availability of Amazon Elastic Compute Cloud (Amazon EC2) Capacity Blocks for ML. You can use EC2 Capacity Blocks to reserve GPU instances in an Amazon EC2 UltraCluster for a future date for the amount of time that you require to run your machine learning (ML) workloads. This is an innovative way to reserve capacity where you can schedule GPU instances to be available on a future date for just the amount of time that you require those instances.
Source:: Amazon AWS