Hexagon Backend usage/Init

[TRM-coding]

In classic backed e.g. cpu,opencl , we can use ggml_backend_<backend_name>_init to create a backend .
Like :ggml_backend_cpu_init, ggml_backend_opencl_init
which can support simply run some experience code.
But for Hexagon NPU , ggml_backend_hexagon_init haven't be implemented.
Does this API be Deprecated in Hexagon backend or just work in progress ?

And what's standard way to init a backend and call function "ggml_backend_graph_compute()" to finish a compute task?