You can now more easily set up or select your Identity and Access Management (IAM) role when connecting to an Amazon Redshift cluster from the Amazon Machine Learning (Amazon ML) console. To streamline the process of setting up your connection to Amazon Redshift,Amazon ML now pre-populates an interactive drop-down menu of existing IAM roles that contain an Amazon ML managed policy for Amazon Redshift, and other IAM roles that you might prefer. From the Amazon ML console, and you contain the option of dynamically creating a new IAM role that uses the Amazon ML managed policy,enabling you to quickly connect to your Amazon Redshift cluster.
Source: amazon.com