Which service can be utilized with ModelArts to efficiently deploy models on devices?

ModelArts is a comprehensive AI development platform that enables users to quickly and effectively create, train, and deploy models. When it comes to deploying models specifically on devices, HiLens is the optimal service to use. HiLens is designed for edge computing and AI applications, providing a capability for efficient deployment of AI models on devices such as cameras and gateways.

Using HiLens allows developers to take advantage of optimized performance, lower latency, and increased efficiency when running models in environments closer to the data source, which is essential for real-time applications. This suits scenarios where processing needs to occur on-site rather than being sent back to a centralized cloud service.

In contrast, other services mentioned, like ECS (Elastic Cloud Server), OBS (Object Storage Service), and OCR (Optical Character Recognition), serve different functions. ECS is more focused on providing scalable cloud compute resources, OBS is focused on data storage, and OCR is a specific function for understanding and processing textual data from images. None of these services are specifically tailored for deploying AI models directly on devices in the same way HiLens is, making it the ideal choice for this question.