ModuleNotFoundError: No module named 'haystack.nodes'

I am following the tutorial from haystacks website for Extractive QA system. I am trying to convert PDF to Text.
Link to the blog is here : (https://www.deepset.ai/blog/automating-information-extraction-with-question-answering)

I pip installed haystack but I get this error. I even tried !pip install haystack.nodes but that doesn't work.

Note: I am using Google Colab for this.

Here is my detailed code and error:

!pip -q install haystack haystack.nodes
path = '/content/drive/MyDrive/Colab Notebooks/NLP/Information Extraction QA with Haystack (Adidas Financial corpus)'
from haystack.nodes import PDFToTextConverter

pdf_converter = PDFToTextConverter(remove_numeric_tables=True, valid_languages=['en'])

converted = pdf_converter.convert(file_path = path, meta = { 'company': 'Company_1', 'processed': False })

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-7-61021fb3b7b8> in <cell line: 1>()
----> 1 from haystack.nodes import PDFToTextConverter
      2 
      3 pdf_converter = PDFToTextConverter(remove_numeric_tables=True, valid_languages=['en'])
      4 
      5 converted = pdf_converter.convert(file_path = path, meta = { 'company': 'Company_1', 'processed': False })

To install Haystack, you need to run pip install farm-haystack. The pypi package is called farm-haystack and not just haystack as Stefano mentioned.

A good starting point are the Haystack tutorials, which you can run as python notebooks on Google Colab, for example this tutorial using the PDFToTextConverter.

Do not name any of your files haystack.py otherwise you will get import fails. This goes for all projects, never name any file like the library itself.