You can now run your training jobs with the built-in Amazon SageMaker algorithms up to 35% faster with Pipe input mode. Using Pipe input mode, your training job streams data directly from Amazon Simple Storage Service (Amazon S3) to the algorithm container on the training instances, to provide faster start times for training jobs and better throughput. For example, benchmarks indicated start times improved by up to 10 minutes on an 78GB file, with throughput twice as fast in some benchmarks. 

Source: Amazon Web Services News Pipe Input Mode is now Supported in Amazon SageMaker Algorithms