Move the llmodel C API to new top-level directory and version it.

gpt4all-backend/llmodel_c.cpp

@@ -0,0 +1,161 @@
+#include "llmodel_c.h"
+
+#include "gptj.h"
+#include "llamamodel.h"
+#include "mpt.h"
+
+struct LLModelWrapper {
+    LLModel *llModel = nullptr;
+    LLModel::PromptContext promptContext;
+};
+
+llmodel_model llmodel_gptj_create()
+{
+    LLModelWrapper *wrapper = new LLModelWrapper;
+    wrapper->llModel = new GPTJ;
+    return reinterpret_cast<void*>(wrapper);
+}
+
+void llmodel_gptj_destroy(llmodel_model gptj)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(gptj);
+    delete wrapper->llModel;
+    delete wrapper;
+}
+
+llmodel_model llmodel_mpt_create()
+{
+    LLModelWrapper *wrapper = new LLModelWrapper;
+    wrapper->llModel = new MPT;
+    return reinterpret_cast<void*>(wrapper);
+}
+
+void llmodel_mpt_destroy(llmodel_model mpt)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(mpt);
+    delete wrapper->llModel;
+    delete wrapper;
+}
+
+llmodel_model llmodel_llama_create()
+{
+    LLModelWrapper *wrapper = new LLModelWrapper;
+    wrapper->llModel = new LLamaModel;
+    return reinterpret_cast<void*>(wrapper);
+}
+
+void llmodel_llama_destroy(llmodel_model llama)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(llama);
+    delete wrapper->llModel;
+    delete wrapper;
+}
+
+bool llmodel_loadModel(llmodel_model model, const char *model_path)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->loadModel(model_path);
+}
+
+bool llmodel_isModelLoaded(llmodel_model model)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->isModelLoaded();
+}
+
+uint64_t llmodel_get_state_size(llmodel_model model)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->stateSize();
+}
+
+uint64_t llmodel_save_state_data(llmodel_model model, uint8_t *dest)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->saveState(dest);
+}
+
+uint64_t llmodel_restore_state_data(llmodel_model model, const uint8_t *src)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->restoreState(src);
+}
+
+// Wrapper functions for the C callbacks
+bool prompt_wrapper(int32_t token_id, void *user_data) {
+    llmodel_prompt_callback callback = reinterpret_cast<llmodel_prompt_callback>(user_data);
+    return callback(token_id);
+}
+
+bool response_wrapper(int32_t token_id, const std::string &response, void *user_data) {
+    llmodel_response_callback callback = reinterpret_cast<llmodel_response_callback>(user_data);
+    return callback(token_id, response.c_str());
+}
+
+bool recalculate_wrapper(bool is_recalculating, void *user_data) {
+    llmodel_recalculate_callback callback = reinterpret_cast<llmodel_recalculate_callback>(user_data);
+    return callback(is_recalculating);
+}
+
+void llmodel_prompt(llmodel_model model, const char *prompt,
+                    llmodel_response_callback prompt_callback,
+                    llmodel_response_callback response_callback,
+                    llmodel_recalculate_callback recalculate_callback,
+                    llmodel_prompt_context *ctx)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+
+    // Create std::function wrappers that call the C function pointers
+    std::function<bool(int32_t)> prompt_func =
+        std::bind(&prompt_wrapper, std::placeholders::_1, reinterpret_cast<void*>(prompt_callback));
+    std::function<bool(int32_t, const std::string&)> response_func =
+        std::bind(&response_wrapper, std::placeholders::_1, std::placeholders::_2, reinterpret_cast<void*>(response_callback));
+    std::function<bool(bool)> recalc_func =
+        std::bind(&recalculate_wrapper, std::placeholders::_1, reinterpret_cast<void*>(recalculate_callback));
+
+    // Copy the C prompt context
+    wrapper->promptContext.n_past = ctx->n_past;
+    wrapper->promptContext.n_ctx = ctx->n_ctx;
+    wrapper->promptContext.n_predict = ctx->n_predict;
+    wrapper->promptContext.top_k = ctx->top_k;
+    wrapper->promptContext.top_p = ctx->top_p;
+    wrapper->promptContext.temp = ctx->temp;
+    wrapper->promptContext.n_batch = ctx->n_batch;
+    wrapper->promptContext.repeat_penalty = ctx->repeat_penalty;
+    wrapper->promptContext.repeat_last_n = ctx->repeat_last_n;
+    wrapper->promptContext.contextErase = ctx->context_erase;
+
+    // Call the C++ prompt method
+    wrapper->llModel->prompt(prompt, prompt_func, response_func, recalc_func, wrapper->promptContext);
+
+    // Update the C context by giving access to the wrappers raw pointers to std::vector data
+    // which involves no copies
+    ctx->logits = wrapper->promptContext.logits.data();
+    ctx->logits_size = wrapper->promptContext.logits.size();
+    ctx->tokens = wrapper->promptContext.tokens.data();
+    ctx->tokens_size = wrapper->promptContext.tokens.size();
+
+    // Update the rest of the C prompt context
+    ctx->n_past = wrapper->promptContext.n_past;
+    ctx->n_ctx = wrapper->promptContext.n_ctx;
+    ctx->n_predict = wrapper->promptContext.n_predict;
+    ctx->top_k = wrapper->promptContext.top_k;
+    ctx->top_p = wrapper->promptContext.top_p;
+    ctx->temp = wrapper->promptContext.temp;
+    ctx->n_batch = wrapper->promptContext.n_batch;
+    ctx->repeat_penalty = wrapper->promptContext.repeat_penalty;
+    ctx->repeat_last_n = wrapper->promptContext.repeat_last_n;
+    ctx->context_erase = wrapper->promptContext.contextErase;
+}
+
+void llmodel_setThreadCount(llmodel_model model, int32_t n_threads)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    wrapper->llModel->setThreadCount(n_threads);
+}
+
+int32_t llmodel_threadCount(llmodel_model model)
+{
+    LLModelWrapper *wrapper = reinterpret_cast<LLModelWrapper*>(model);
+    return wrapper->llModel->threadCount();
+}