test_hierarchical.py 文件源码

def test_structured_linkage_tree():
    # Check that we obtain the correct solution for structured linkage trees.
    rng = np.random.RandomState(0)
    mask = np.ones([10, 10], dtype=np.bool)
    # Avoiding a mask with only 'True' entries
    mask[4:7, 4:7] = 0
    X = rng.randn(50, 100)
    connectivity = grid_to_graph(*mask.shape)
    for tree_builder in _TREE_BUILDERS.values():
        children, n_components, n_leaves, parent = \
            tree_builder(X.T, connectivity)
        n_nodes = 2 * X.shape[1] - 1
        assert_true(len(children) + n_leaves == n_nodes)
        # Check that ward_tree raises a ValueError with a connectivity matrix
        # of the wrong shape
        assert_raises(ValueError,
                      tree_builder, X.T, np.ones((4, 4)))
        # Check that fitting with no samples raises an error
        assert_raises(ValueError,
                      tree_builder, X.T[:0], connectivity)