I want to finetune a large language model with my own collections of pdf files. so first I need to convert the pdf files into text files. my pdf files are not image so I dont need to use OCR tools. can you introduce a good method to do it? I am using python. the pdf file often contain header/footer note and line number which I want to remove. Provide your response in exactly 3 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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