Function test_concatenate

dask/array/tests/test_array_core.py:747–789

()

def test_concatenate():
    a, b, c = (
        Array(
            graph_from_arraylike(object(), chunks=(2, 3), shape=(4, 6), name=name),
            name,
            chunks=(2, 3),
            dtype="f8",
            shape=(4, 6),
        )
        for name in "ABC"
    )

    x = concatenate([a, b, c], axis=0)

    assert x.shape == (12, 6)
    assert x.chunks == ((2, 2, 2, 2, 2, 2), (3, 3))
    assert x.dask[(x.name, 0, 1)] == ("A", 0, 1)
    assert x.dask[(x.name, 5, 0)] == ("C", 1, 0)
    assert same_keys(x, concatenate([a, b, c], axis=0))

    y = concatenate([a, b, c], axis=1)

    assert y.shape == (4, 18)
    assert y.chunks == ((2, 2), (3, 3, 3, 3, 3, 3))
    assert y.dask[(y.name, 1, 0)] == ("A", 1, 0)
    assert y.dask[(y.name, 1, 5)] == ("C", 1, 1)
    assert same_keys(y, concatenate([a, b, c], axis=1))

    assert set(b.dask.keys()).issubset(y.dask.keys())

    z = concatenate([a], axis=0)

    assert z.shape == a.shape
    assert z.chunks == a.chunks
    assert z.dask == a.dask
    assert z is a

    assert (
        concatenate([a, b, c], axis=-1).chunks == concatenate([a, b, c], axis=1).chunks
    )

    pytest.raises(ValueError, lambda: concatenate([]))
    pytest.raises(ValueError, lambda: concatenate([a, b, c], axis=2))


@pytest.mark.parametrize(