Here is a concise summary of the provided article section:

## Model Structure

The article discusses the structure of the model being described. The key points are:

- This section, titled "Model structure", focuses on detailing the structure of the model.
- The section provides an overview and explanation of the model's structure.
- It appears to be a technical section diving into the specifics of the model architecture and design.
- Without additional context from the full article, the summary is limited to these high-level points about the model structure.

The summary captures the main focus and content of the provided text, while keeping the summary concise and focused on the essential information. It avoids adding any external details not present in the given excerpt.