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in android 10, an app can ask for the execution time if the app has specified a single device to use during the compilation process. for details, see measuretiming and device discovery and assignment. in this case, an nn hal 1.2 driver must measure execution duration or report uint64_max (to indicate that duration is unavailable) when executing a request. the driver should minimize any performance penalty resulting from measuring execution duration.in addition to testing, we run daily builds on a subset of devices to ensure that we have the latest and most stable build of the zte mf190 driver. we collect metrics from these builds and compare the driver to the reference implementation in cts to track progress. additionally, we run these builds on tablets and monitor stability so that we know a fixed driver version works well on these devices. also, we load several different tools with the zte mf190 driver to test correctness in the hardware.its important to note that some devices that we have developed hardware implementations for for the zte mf190 will work in non-direct mode and lose some of the hardware acceleration. that is good because it means these devices are generally well supported. however, theres certain drivers such as androidopenaccess that actually require a direct path for audio to properly do its job. so, if your device is listed below as having a nnapi hal greater than 1.0, we actually test the drivers directness to make sure that the drivers are realpath friendly. the driver is written to support other hals but that support is not documented and we have not taken the time to thoroughly test it.
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