Update cupy/util.pyx
@@ -208,4 +208,4 @@ def check_array(obj, *, arg_name):
"""
if not isinstance(obj, cupy.ndarray):
raise TypeError(
- '\'{}\' must be an array, not {}.'.format(arg_name, type(obj)))
+ '\'{}\' must be a cupy.ndarray object, not {}.'.format(arg_name, type(obj)))
