size mismatch

[Bingtai1015]

在使用biaobei.py里的get_char_embedding_from_bert生成expanded_embeds.pkl时显示如下，该怎么解决呀？
size mismatch for bert.embeddings.position_embeddings.weight: copying a param with shape torch.Size([512, 1024]) from checkpoint, the shape in current model is torch.Size([512, 768]).