A naive question

Hello:

In the code for 'label_largest_component()' below,
I can't make sense of the third line. What does it accomplish?

    label = g.new_vertex_property("bool")
    c, h = label_components(g, directed=directed)
    vfilt, inv = g.get_vertex_filter()
    label.fa = c.fa == h.argmax()
    return label

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