This is the demo page for Jetpack’s Tiled Gallery. Jetpack adds powerful features previously only available to WordPress.com users including customization, traffic, mobile, content, and performance tools. We highly recommend it for TA Portfolio and our other themes. You can download it from WordPress plugin repository.
These are all default settings when Jetpack Tiled galleries are enabled. You just need to select « Tiled Mosaic » options when creating galleries via WordPress Media Manager.