gen_empty_region — 创建一个空区域。
gen_empty_region( : EmptyRegion : : )
算子 gen_empty_region creates an empty region.
This means that the output parameter contains an object.
Thus, count_obj returns 1.
The area of the region is 0. Most of the
shape features are undefined (0).
It should be noted that an empty region must not
be confused with the empty tuple.
EmptyRegion (输出对象) region → object
Empty region (no pixels).
基础