Need advise for domain specific QA system.

I am trying to build a question answering system on instruction manuals (kind of one that comes with electrical appliances) . I am still at a very initial phase and I have some doubts.

1. The manuals are in PDF format. They are highly unstructured with tables, images and text in no specific format (different appliance manufacturers have different formats). I have tried various techniques and ways to extract text and split the pdf into smaller sub-documents (like page-wise split, paragraph-wise …

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