### What problem does this PR solve?
when use slim image, remove ```torch``` denpendency.
### Type of change
- [✓] Bug Fix (non-breaking change which fixes an issue)
---------
Co-authored-by: chongchuanbing <chongchuanbing@gmail.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
Fix: renrank_model and pdf_parser bugs | Update: session API
#2575#2559
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Refactoring
---------
Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>
### What problem does this PR solve?
#2295
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
### What problem does this PR solve?
#1704
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
---------
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
_fix: When parsing the bold content in PDF, the result is duplicated._
the detail: [When using OCR to recognize Chinese titles, the structure
appears to be
duplicated](https://github.com/infiniflow/ragflow/issues/1718)
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
pypdf and PyPDF2 possible Infinite Loop when a comment isn't followed by
a character #59
### Type of change
- [x] Refactoring
### What problem does this PR solve?
After checking the language of the pdf, the line will hardcode the
language into Chinese
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Fix occasional errors in pdf table recognition
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
- Update readme
- Add license
### Type of change
- [x] Documentation Update
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
When pdfparser call `_naive_vertical_merge` method，there is a "not
concating feature " value by computing difference between `b` and `b_`'s
layoutno ,but actually is `b` and `b`. I think it's a bug, so fix it.
Please check again.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
fix a bug comes when parse some pdf file #436
### Type of change
- [☑️ ] Bug Fix (non-breaking change which fixes an issue)
