A convolutional deep belief network is a kind of computer program that can look at pictures and try to understand what is in them. It does this by looking at small parts of the picture at a time and figuring out what kind of shapes and patterns are in those squares. Then it takes all of these smaller pieces and puts them together to get a complete picture.
To help you understand better, imagine that you have a big puzzle to solve. The puzzle is a picture of a dog. You could start by looking at one small piece of the puzzle at a time and trying to figure out what part of the dog it belongs to. Once you have figured out all of the smaller pieces, you can put them all together to get a complete picture of the dog.
The convolutional deep belief network works in a similar way. Instead of pieces of a puzzle, it looks at small parts of a picture called "features." These features can be things like straight lines, curves, and corners. The network tries to figure out which features are present in the picture and how they are connected to create the larger picture.
Once the convolutional deep belief network has figured out the features in the picture, it can use that information to recognize objects. For example, if it sees a picture of a dog, it will identify the features of the dog, such as the shape of its ears, nose, and tail. Then it can compare these features to those of other pictures it has seen in the past to identify the dog.
Overall, a convolutional deep belief network is a very advanced computer program that can learn to understand pictures by breaking them down into smaller parts and then putting those parts back together again.