Do I need to follow any particular format if I want to use a different corpus?

[nghiahhnguyen]

From what I've seen in the sample corpus, the corpus should follow the following format:
# <doc_id>
<doc_content>
# <doc_id>
<doc_content>
# <doc_id>
<doc_content>

However, at the end of <doc_content>, I see a lot of numbers and I am not entirely sure what their meaning is.