Function isnonzero

dask/array/routines.py:2129–2138

Handle special cases where conversion to bool does not work correctly. xref: https://github.com/numpy/numpy/issues/9479

(a)

def isnonzero(a):
    """Handle special cases where conversion to bool does not work correctly.
    xref: https://github.com/numpy/numpy/issues/9479
    """
    try:
        np.zeros([], dtype=a.dtype).astype(bool)
    except ValueError:
        return a.map_blocks(_isnonzero, dtype=bool)
    else:
        return a.astype(bool)


@derived_from(np)