Product	Supported (√/x)
Ascend 950PR/Ascend 950DT	√
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas training products	√
Atlas inference products	x
Atlas 200I/500 A2 inference products	x

Unregisters the host memory. This API is used in pair with acl.rt.host_register.

C Prototype

aclError aclrtHostUnregister(void *ptr)

Parameter	Description
ptr	Int, host memory address.

Return Value	Description
ret	Int, 0 on success; else failure.

Function: host_unregister