WIP #60

[shamikbose]

Issues with download_and_extract()

NOTE: This is WIP. Folder structures are being lost when using download_and_extract()
Manual extraction:

Extraction using download_manager:

• Name: CRAFT
• Description: CRAFT corpus, a collection of 97 articles from the PubMed Central Open Access subset, each of which has been annotated along a number of different axes spanning structural, coreference, and concept annotation
• Paper: https://bmcbioinformatics.biomedcentral.com/articles/10.1186/1471-2105-13-161
• Data: https://github.com/UCDenver-ccp/CRAFT/releases

Checkbox

• Confirm that this PR is linked to the dataset issue.
• Create the dataloader script biodatasets/my_dataset/my_dataset.py (please use only lowercase and underscore for dataset naming).
• Provide values for the _CITATION, _DATASETNAME, _DESCRIPTION, _HOMEPAGE, _LICENSE, _URLs, _SUPPORTED_TASKS, _SOURCE_VERSION, and _BIGBIO_VERSION variables.
• Implement _info(), _split_generators() and _generate_examples() in dataloader script.
• Make sure that the BUILDER_CONFIGS class attribute is a list with at least one BigBioConfig for the source schema and one for a bigbio schema.
• Confirm dataloader script works with datasets.load_dataset function.
• Confirm that your dataloader script passes the test suite run with python -m tests.test_bigbio biodatasets/my_dataset/my_dataset.py.
• If my dataset is local, I have provided an output of the unit-tests in the PR (please copy paste). This is OPTIONAL for public datasets, as we can test these without access to the data files.

[shamikbose]

UPDATE: This passes all tests as a local dataset. However, I have a few more follow-up questions:

1. Some annotations (~2k of 97k) are multiple, non-conitnuous annotations. The spanned text is also partial. How should this be handled? At the moment, I'm logging a warning with the entity_id and the filename. Example annotation below

<annotation>
    <mention id="GO_BP_2016_02_16_Instance_19281" />
    <annotator id="GO_BP_2016_02_16_Instance_10000">Mike Bada, University of Colorado Anschutz Medical Campus</annotator>
    <span start="1351" end="1362" />
    <span start="1376" end="1378" />
    <span start="1383" end="1386" />
    <spannedText>development ... of ... PPs</spannedText>
</annotation>

2. MONDO is a completely different file structure (naming conventions), annotation structure and duplicate ids. Should this be handled? Example annotation below

        <annotation annotator="Default" id="11532192-123" motivation="" type="identity">
            <class id="http://purl.obolibrary.org/obo/MONDO_0005041" label="'glaucoma (disease)'"/>
            <span end="1761" id="11532192-124" start="1753">Glaucoma</span>
        </annotation>
        <annotation annotator="Default" id="11532192-129" motivation="" type="identity">
            <class id="http://purl.obolibrary.org/obo/MONDO_0005041" label="'glaucoma (disease)'"/>
            <span end="2047" id="11532192-130" start="2039">glaucoma</span>
        </annotation>

@jason-fries @ruisi-su @galtay

[mariosaenger]

@phlobo I adjusted the implementation. Please have a look at it.

[mariosaenger]

Resolves #938