Method init

subprojects/llama.cpp/src/llama-adapter.cpp:31–92

}

bool llama_adapter_cvec::init(const llama_model & model) {
    const auto & hparams = model.hparams;

    GGML_ASSERT(tensors.empty());
    GGML_ASSERT(ctxs.empty());
    GGML_ASSERT(bufs.empty());

    // create a context for each buffer type
    std::map<ggml_backend_buffer_type_t, ggml_context *> ctx_map;
    auto ctx_for_buft = [&](ggml_backend_buffer_type_t buft) -> ggml_context * {
        auto it = ctx_map.find(buft);
        if (it == ctx_map.end()) {
            ggml_init_params params = {
                /*.mem_size   =*/ hparams.n_layer*ggml_tensor_overhead(),
                /*.mem_buffer =*/ NULL,
                /*.no_alloc   =*/ true,
            };

            ggml_context * ctx = ggml_init(params);
            if (!ctx) {
                return nullptr;
            }

            ctx_map[buft] = ctx;
            ctxs.emplace_back(ctx);

            return ctx;
        }

        return it->second;
    };

    // make tensors
    tensors.reserve(hparams.n_layer);
    tensors.push_back(nullptr); // there's never a tensor for layer 0
    for (size_t il = 1; il < hparams.n_layer; il++) {
        ggml_backend_buffer_type_t buft = model.select_buft(il);
        ggml_context * ctx = ctx_for_buft(buft);
        if (!ctx) {
            LLAMA_LOG_ERROR("%s: failed to allocate context for control vector\n", __func__);
            return false;
        }
        ggml_tensor * tensor = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, hparams.n_embd);
        tensors.push_back(tensor);
    }

    // allocate tensors / buffers and zero
    bufs.reserve(ctx_map.size());
    for (auto it : ctx_map) {
        ggml_backend_buffer_type_t buft = it.first;
        ggml_context * ctx = it.second;
        ggml_backend_buffer_t buf = ggml_backend_alloc_ctx_tensors_from_buft(ctx, buft);
        if (!buf) {
            LLAMA_LOG_ERROR("%s: failed to allocate buffer for control vector\n", __func__);
            return false;
        }
        ggml_backend_buffer_clear(buf, 0);
        bufs.emplace_back(buf);