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説明
Daru::Vector.new([1,2,3], index: [1,1,1])
=> IndexError: Expected index size >= vector size. Index size : 1, vector size : 3
Daru::Index.new([1,1,1])
=> #<Daru::Index(1): {1}>
Index#initialize uses @relation_hash = index.each_with_index.to_h.freeze,
this causes
[1,2,1].each_with_index.to_h
=> {1=>2, 2=>1}