Fix errors due to the major update of NumPy#28

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KeishiS:modify_pkg_ver

Commits on Aug 28, 2024

pinned numpy version to avoid breaking changes before major update
KeishiS
committed

Commits on Aug 29, 2024

updated load function to explicitly specify default values due to changes in numpy version update 1.15 -> 1.16
KeishiS
committed