This document discusses Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and DevOps for data science. It provides an overview of Azure services for IaaS including virtual machines and GPU instances. It also discusses PaaS options like Azure Machine Learning for deploying models as web services. The document advocates for using Azure services like HDInsight, Data Factory and Machine Learning to build distributed and scalable data science systems following architectures like lambda architecture. It highlights pros and cons of different approaches for flexibility, scalability and using open source tools for data science workloads on Azure.