pass in anything except for
    the default value, as this argument is not used.

explicit : {False, True} optional (default: False)
    When set to True, only the stored elements will be considered.
    If a row/column is empty, the sparse.coo_array returned
    has no stored element (i.e. an implicit zero) for that row/column.

    .. versionadded:: 1.15.0

Returns
-------
amin : coo_matrix or scalar
    Minimum of `a`. If `axis` is None, the result is a scalar value.
    If `axis` is given, the result is a sparse.coo_array of dimension
    ``a.ndim - 1``.

See Also
--------
max : The maximum value of a sparse array/matrix along a given axis.
numpy.min : NumPy's implementation of 'min'

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