BLIP2 generate short repeat caption

[Daisy-Zhang]

Hello, nice work.

When I use BLIP2 to generate some captions of input image, it will sometime give the repeated short sentences, such as:

a man with a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on top of a hat on.

How does that happen and how to avoid that? Thanks :)