Use list comprehensions to create tuple instead of generator
Use list comprehensions to create tuple instead of generator

Reference

- https://github.com/cupy/cupy/pull/1040#discussion_r175372051
- https://stackoverflow.com/questions/15410119/use-list-comprehension-to-build-a-tuple

cupy/cupy,cupy/cupy,cupy/cupy,cupy/cupy