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accessibility of the gmt in the tutorial #15

Description

@AndGob

Tutorial works knowing the presence of the example PBMC gmt in the docs/tutorial/folder and works when using the tutorial notebook present in that destination. However, in the documentation it is indicated:

gmt=investigate.load_signatures('data/atlas.gmt')

But following the tutorial in a "blind" mode rise an error like this:

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[436], line 1
----> 1 gmt=investigate.load_signatures('data/atlas.gmt')

File ~/miniconda3/envs/TCellsProj/lib/python3.9/site-packages/cia/investigate.py:42, in load_signatures(signatures_input, description_field_available)
      8 """
      9 Load gene signatures from a given source.
     10 
   (...)
     39 ['gene1', 'gene2']
     40 """
     41 if isinstance(signatures_input, str):
---> 42     with open(signatures_input, 'r') as f:
     43         lines = f.readlines()
     45     signatures = {}

FileNotFoundError: [Errno 2] No such file or directory: 'data/atlas.gmt'

Can we make the life easier directly importing the data with a function as for scanpy datasets or simply putting a download link (from github) in the tutorial documentation?

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