Eugene Yurtsev 2ceb807da2

Add PDF parser implementations (#4356) ...

# Add PDF parser implementations

This PR separates the data loading from the parsing for a number of
existing PDF loaders.

Parser tests have been designed to help encourage developers to create a
consistent interface for parsing PDFs.

This interface can be made more consistent in the future by adding
information into the initializer on desired behavior with respect to splitting by
page etc.

This code is expected to be backwards compatible -- with the exception
of a bug fix with pymupdf parser which was returning `bytes` in the page
content rather than strings.

Also changing the lazy parser method of document loader to return an
Iterator rather than Iterable over documents.

## Before submitting

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## Who can review?

Community members can review the PR once tests pass. Tag
maintainers/contributors who might be interested:

@

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        @hwchase17 - project lead

        Tracing / Callbacks
        - @agola11

        Async
        - @agola11

        DataLoader Abstractions
        - @eyurtsev

        LLM/Chat Wrappers
        - @hwchase17
        - @agola11

        Tools / Toolkits
        - @vowelparrot
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2023-05-09 10:24:17 -04:00

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