Import `using_allocator` in `cupy.cuda`
@@ -87,6 +87,7 @@ from cupy.cuda.memory import MemoryPointer # NOQA
from cupy.cuda.memory import MemoryPool # NOQA
from cupy.cuda.memory import set_allocator # NOQA
from cupy.cuda.memory import get_allocator # NOQA
+from cupy.cuda.memory import using_allocator # NOQA
from cupy.cuda.memory import UnownedMemory # NOQA
from cupy.cuda.memory_hook import MemoryHook # NOQA
from cupy.cuda.pinned_memory import alloc_pinned_memory # NOQA
