The logprob of image captioning result of mplug is very small

[Wykay]

Hello, I am using mplug to do image captioning task.

At inference, I use beam search to generate results, and I find that the topk_probs from beam_generator.translate_batch_scst() is very small(like 0.0014 after exp()), indicating that the confidence score of caption is very small, could you tell me if I am using the wrong output as confidence score of the caption, or why this confidence number is such small? Thx a lot!

I follow this to write the code of inference.