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Updated the example code in readme for Indexing PDF / Docx files (#502)

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* Updated the example code to Indexing PDF / Docx files

The example code was referencing a structure haystack.indexing which does not exist anymore. Modified this and the function "extract_pages" with "convert"

* Update converter example in readme

Co-authored-by: Malte Pietsch <malte.pietsch@deepset.ai>
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Sanjay Kamath 2020-10-19 15:04:33 +02:00 committed by GitHub
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README.rst
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@ -284,15 +284,15 @@ Example:
.. code-block:: python
#PDF
from haystack.indexing.file_converters.pdf import PDFToTextConverter
converter = PDFToTextConverter(remove_header_footer=True, remove_numeric_tables=True, valid_languages=["de","en"])
pages = converter.extract_pages(file_path=file)
# => list of str, one per page
from haystack.file_converter.pdf import PDFToTextConverter
converter = PDFToTextConverter(remove_numeric_tables=True, valid_languages=["de","en"])
doc = converter.convert(file_path=file, meta=None)
# => {"text": "text first page \f text second page ...", "meta": None}
#DOCX
from haystack.indexing.file_converters.docx import DocxToTextConverter
converter = DocxToTextConverter()
paragraphs = converter.extract_pages(file_path=file)
# => list of str, one per paragraph (as docx has no direct notion of pages)
from haystack.file_converter.docx import DocxToTextConverter
converter = DocxToTextConverter(remove_numeric_tables=True, valid_languages=["de","en"])
doc = converter.convert(file_path=file, meta=None)
# => {"text": "some text", "meta": None}
Advanced document convertion is enabled by leveraging mature text extraction library `Apache Tika <https://tika.apache.org/>`_, which is mostly written in Java. Although it's possible to call Tika API from Python, the current :code:`TikaConverter` only supports RESTful call to a Tika server running at localhost. One may either run Tika as a REST service at port 9998 (default), or to start a `docker container for Tika <https://hub.docker.com/r/apache/tika/tags>`_. The latter is recommended, as it's easily scalable, and does not require setting up any Java runtime environment. What's more, future update is also taken care of by docker.
Either way, TikaConverter makes RESTful calls to convert any document format supported by Tika. Example code can be found at :code:`indexing/file_converters/utils.py`'s :code:`tika_convert)_files_to_dicts` function:
@ -312,9 +312,9 @@ If you feel adventurous, Tika even supports some image OCR with Tesseract, or ob
.. code-block:: python
converter = TikaConverter(remove_header_footer=True)
pages = converter.extract_pages(file_path=path)
pages, meta = converter.extract_pages(file_path=path, return_meta=True)
converter = TikaConverter(tika_url: str = "http://localhost:9998/tika")
doc = converter.convert(file_path=path)
# => {"text": "text first page \f text second page ...", "meta": {"Content-Type": 'application/pdf', "Last-Modified":...}}
Contributing
=============