91 lines
2.8 KiB
Python
91 lines
2.8 KiB
Python
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"""
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================================
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Datasets (:mod:`scipy.datasets`)
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================================
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.. currentmodule:: scipy.datasets
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Dataset Methods
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===============
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.. autosummary::
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:toctree: generated/
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ascent
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face
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electrocardiogram
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Utility Methods
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===============
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.. autosummary::
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:toctree: generated/
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download_all -- Download all the dataset files to specified path.
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clear_cache -- Clear cached dataset directory.
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Usage of Datasets
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=================
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SciPy dataset methods can be simply called as follows: ``'<dataset-name>()'``
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This downloads the dataset files over the network once, and saves the cache,
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before returning a `numpy.ndarray` object representing the dataset.
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Note that the return data structure and data type might be different for
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different dataset methods. For a more detailed example on usage, please look
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into the particular dataset method documentation above.
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How dataset retrieval and storage works
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=======================================
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SciPy dataset files are stored within individual github repositories under the
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SciPy GitHub organization, following a naming convention as
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``'dataset-<name>'``, for example `scipy.datasets.face` files live at
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https://github.com/scipy/dataset-face. The `scipy.datasets` submodule utilizes
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and depends on `Pooch <https://www.fatiando.org/pooch/latest/>`_, a Python
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package built to simplify fetching data files. Pooch uses these repos to
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retrieve the respective dataset files when calling the dataset function.
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A registry of all the datasets, essentially a mapping of filenames with their
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SHA256 hash and repo urls are maintained, which Pooch uses to handle and verify
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the downloads on function call. After downloading the dataset once, the files
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are saved in the system cache directory under ``'scipy-data'``.
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Dataset cache locations may vary on different platforms.
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For macOS::
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'~/Library/Caches/scipy-data'
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For Linux and other Unix-like platforms::
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'~/.cache/scipy-data' # or the value of the XDG_CACHE_HOME env var, if defined
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For Windows::
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'C:\\Users\\<user>\\AppData\\Local\\<AppAuthor>\\scipy-data\\Cache'
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In environments with constrained network connectivity for various security
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reasons or on systems without continuous internet connections, one may manually
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load the cache of the datasets by placing the contents of the dataset repo in
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the above mentioned cache directory to avoid fetching dataset errors without
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the internet connectivity.
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"""
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from ._fetchers import face, ascent, electrocardiogram # noqa: E402
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from ._download_all import download_all
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from ._utils import clear_cache
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__all__ = ['ascent', 'electrocardiogram', 'face',
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'download_all', 'clear_cache']
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from scipy._lib._testutils import PytestTester
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test = PytestTester(__name__)
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del PytestTester
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