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spec: single device drafter should create meta backend wrapper (#28390)

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This commit is contained in:
Aman Gupta
2026-09-08 20:44:33 +08:00
committed by GitHub
parent 03fa73cb27
commit 415e909d84
5 changed files with 27 additions and 7 deletions
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common/speculative.cpp
+12 -1
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@@ -2467,11 +2467,22 @@ common_params common_base_params_to_speculative(const common_params & params) {
result.pooling_type = LLAMA_POOLING_TYPE_UNSPECIFIED;
if (has_draft) {
result.devices = params_spec.devices;
// default to global devices value
if (!params_spec.devices.empty()) {
result.devices = params_spec.devices;
}
result.model = params_spec.mparams;
result.n_gpu_layers = params_spec.n_gpu_layers;
result.tensor_buft_overrides = params_spec.tensor_buft_overrides;
// a draft pinned to a single device doesn't need the meta wrapper an inherited -sm tensor would give it
// (the device list is null-terminated, so a single device means size 2)
const size_t n_devs = std::count_if(params_spec.devices.begin(), params_spec.devices.end(),
[](ggml_backend_dev_t d) { return d != nullptr; });
if (n_devs == 1) {
result.split_mode = LLAMA_SPLIT_MODE_LAYER;
}
if (params_spec.cpuparams.n_threads > 0) {
result.cpuparams.n_threads = params_spec.cpuparams.n_threads;
result.cpuparams_batch.n_threads = params_spec.cpuparams_batch.n_threads;