Question about unsupported operation by Backend

[akapoor3518]

We are building new backend over ggml, we dont have all option supported by custom accelerator, can we offload those operation to CPU using ggml_compute_forward(params, node);.
i see that struct ggml_compute_params is locally defined under ggml.c and no backend is doing instead of failing if operation not supported by that particular backend. Can you please suggest here.

[slaren]

The way this is intended to be handled is by reporting the list of supported operations in the supports_op function. The scheduler (ggml_backend_sched) uses this function to determine which operations need to be delegated to the CPU backend. It is not possible to call the CPU backend directly from another backend.