1 files changed, 207 insertions, 0 deletions
diff --git a/llama.cpp/examples/simple-chat/simple-chat.cpp b/llama.cpp/examples/simple-chat/simple-chat.cpp
new file mode 100644
index 0000000..57195df
--- /dev/null
+++ b/llama.cpp/examples/simple-chat/simple-chat.cpp
@@ -0,0 +1,207 @@
+#include "llama.h"
+#include <cstdio>
+#include <cstring>
+#include <iostream>
+#include <string>
+#include <vector>
+
+static void print_usage(int, char ** argv) {
+    printf("\nexample usage:\n");
+    printf("\n    %s -m model.gguf [-c context_size] [-ngl n_gpu_layers]\n", argv[0]);
+    printf("\n");
+}
+
+int main(int argc, char ** argv) {
+    std::string model_path;
+    int ngl = 99;
+    int n_ctx = 2048;
+
+    // parse command line arguments
+    for (int i = 1; i < argc; i++) {
+        try {
+            if (strcmp(argv[i], "-m") == 0) {
+                if (i + 1 < argc) {
+                    model_path = argv[++i];
+                } else {
+                    print_usage(argc, argv);
+                    return 1;
+                }
+            } else if (strcmp(argv[i], "-c") == 0) {
+                if (i + 1 < argc) {
+                    n_ctx = std::stoi(argv[++i]);
+                } else {
+                    print_usage(argc, argv);
+                    return 1;
+                }
+            } else if (strcmp(argv[i], "-ngl") == 0) {
+                if (i + 1 < argc) {
+                    ngl = std::stoi(argv[++i]);
+                } else {
+                    print_usage(argc, argv);
+                    return 1;
+                }
+            } else {
+                print_usage(argc, argv);
+                return 1;
+            }
+        } catch (std::exception & e) {
+            fprintf(stderr, "error: %s\n", e.what());
+            print_usage(argc, argv);
+            return 1;
+        }
+    }
+    if (model_path.empty()) {
+        print_usage(argc, argv);
+        return 1;
+    }
+
+    // only print errors
+    llama_log_set([](enum ggml_log_level level, const char * text, void * /* user_data */) {
+        if (level >= GGML_LOG_LEVEL_ERROR) {
+            fprintf(stderr, "%s", text);
+        }
+    }, nullptr);
+
+    // load dynamic backends
+    ggml_backend_load_all();
+
+    // initialize the model
+    llama_model_params model_params = llama_model_default_params();
+    model_params.n_gpu_layers = ngl;
+
+    llama_model * model = llama_model_load_from_file(model_path.c_str(), model_params);
+    if (!model) {
+        fprintf(stderr , "%s: error: unable to load model\n" , __func__);
+        return 1;
+    }
+
+    const llama_vocab * vocab = llama_model_get_vocab(model);
+
+    // initialize the context
+    llama_context_params ctx_params = llama_context_default_params();
+    ctx_params.n_ctx = n_ctx;
+    ctx_params.n_batch = n_ctx;
+
+    llama_context * ctx = llama_init_from_model(model, ctx_params);
+    if (!ctx) {
+        fprintf(stderr , "%s: error: failed to create the llama_context\n" , __func__);
+        return 1;
+    }
+
+    // initialize the sampler
+    llama_sampler * smpl = llama_sampler_chain_init(llama_sampler_chain_default_params());
+    llama_sampler_chain_add(smpl, llama_sampler_init_min_p(0.05f, 1));
+    llama_sampler_chain_add(smpl, llama_sampler_init_temp(0.8f));
+    llama_sampler_chain_add(smpl, llama_sampler_init_dist(LLAMA_DEFAULT_SEED));
+
+    // helper function to evaluate a prompt and generate a response
+    auto generate = [&](const std::string & prompt) {
+        std::string response;
+
+        const bool is_first = llama_memory_seq_pos_max(llama_get_memory(ctx), 0) == -1;
+
+        // tokenize the prompt
+        const int n_prompt_tokens = -llama_tokenize(vocab, prompt.c_str(), prompt.size(), NULL, 0, is_first, true);
+        std::vector<llama_token> prompt_tokens(n_prompt_tokens);
+        if (llama_tokenize(vocab, prompt.c_str(), prompt.size(), prompt_tokens.data(), prompt_tokens.size(), is_first, true) < 0) {
+            GGML_ABORT("failed to tokenize the prompt\n");
+        }
+
+        // prepare a batch for the prompt
+        llama_batch batch = llama_batch_get_one(prompt_tokens.data(), prompt_tokens.size());
+        llama_token new_token_id;
+        while (true) {
+            // check if we have enough space in the context to evaluate this batch
+            int n_ctx = llama_n_ctx(ctx);
+            int n_ctx_used = llama_memory_seq_pos_max(llama_get_memory(ctx), 0) + 1;
+            if (n_ctx_used + batch.n_tokens > n_ctx) {
+                printf("\033[0m\n");
+                fprintf(stderr, "context size exceeded\n");
+                exit(0);
+            }
+
+            int ret = llama_decode(ctx, batch);
+            if (ret != 0) {
+                GGML_ABORT("failed to decode, ret = %d\n", ret);
+            }
+
+            // sample the next token
+            new_token_id = llama_sampler_sample(smpl, ctx, -1);
+
+            // is it an end of generation?
+            if (llama_vocab_is_eog(vocab, new_token_id)) {
+                break;
+            }
+
+            // convert the token to a string, print it and add it to the response
+            char buf[256];
+            int n = llama_token_to_piece(vocab, new_token_id, buf, sizeof(buf), 0, true);
+            if (n < 0) {
+                GGML_ABORT("failed to convert token to piece\n");
+            }
+            std::string piece(buf, n);
+            printf("%s", piece.c_str());
+            fflush(stdout);
+            response += piece;
+
+            // prepare the next batch with the sampled token
+            batch = llama_batch_get_one(&new_token_id, 1);
+        }
+
+        return response;
+    };
+
+    std::vector<llama_chat_message> messages;
+    std::vector<char> formatted(llama_n_ctx(ctx));
+    int prev_len = 0;
+    while (true) {
+        // get user input
+        printf("\033[32m> \033[0m");
+        std::string user;
+        std::getline(std::cin, user);
+
+        if (user.empty()) {
+            break;
+        }
+
+        const char * tmpl = llama_model_chat_template(model, /* name */ nullptr);
+
+        // add the user input to the message list and format it
+        messages.push_back({"user", strdup(user.c_str())});
+        int new_len = llama_chat_apply_template(tmpl, messages.data(), messages.size(), true, formatted.data(), formatted.size());
+        if (new_len > (int)formatted.size()) {
+            formatted.resize(new_len);
+            new_len = llama_chat_apply_template(tmpl, messages.data(), messages.size(), true, formatted.data(), formatted.size());
+        }
+        if (new_len < 0) {
+            fprintf(stderr, "failed to apply the chat template\n");
+            return 1;
+        }
+
+        // remove previous messages to obtain the prompt to generate the response
+        std::string prompt(formatted.begin() + prev_len, formatted.begin() + new_len);
+
+        // generate a response
+        printf("\033[33m");
+        std::string response = generate(prompt);
+        printf("\n\033[0m");
+
+        // add the response to the messages
+        messages.push_back({"assistant", strdup(response.c_str())});
+        prev_len = llama_chat_apply_template(tmpl, messages.data(), messages.size(), false, nullptr, 0);
+        if (prev_len < 0) {
+            fprintf(stderr, "failed to apply the chat template\n");
+            return 1;
+        }
+    }
+
+    // free resources
+    for (auto & msg : messages) {
+        free(const_cast<char *>(msg.content));
+    }
+    llama_sampler_free(smpl);
+    llama_free(ctx);
+    llama_model_free(model);
+
+    return 0;
+}