arrayfire.Array is_device option.

What does the option 'is_device' do in an arrayfire.Array? I can't find an entry in the documentation and would like to understand.

Start at the documentation or API entry for arrayfire.Array and determine what the is_device option controls. Document its purpose and expected use clearly, then verify that the explanation answers the original question and fits the existing Array documentation.

索引モデルが issue の本文から書いたものです。