In Bart for the summarization task, the input length is 1024 (1024 token), what does this input represents: (for example i have a document with s1, s2, s500) does this mean that we feed a sequence as sentence per sentence or the whole document must be as input as 1024 token ( all sentences must fit with truncation ) if this true doesn’t  it cause information loss ?
And if it’s sequence per sequence, let’s say 20 sentences at a time of 500, will the output at the top encoder change each time?
To be honest I’m having a difficult time imagining how the encoder is processing the document.