When preparing data for the model, make sure to use the token vocabulary that corresponds to the RoBERTa checkpoint you combined with the Layout Transformer.
As lilt-roberta-en-base uses the same vocabulary as LayoutLMv3, one can use [LayoutLMv3TokenizerFast] to prepare data for the model.
The same is true for lilt-roberta-en-base: one can use [LayoutXLMTokenizerFast] for that model.

Resources
A list of official Hugging Face and community (indicated by 🌎) resources to help you get started with LiLT.