Add interactive mode (#61)

* Initial work on interactive mode.

* Improve interactive mode. Make rev. prompt optional.

* Update README to explain interactive mode.

* Fix OS X build

README.md

@@ -183,6 +183,29 @@ The number of files generated for each model is as follows:
 
 When running the larger models, make sure you have enough disk space to store all the intermediate files.
 
+### Interactive mode
+
+If you want a more ChatGPT-like experience, you can run in interactive mode by passing `-i` as a parameter.
+In this mode, you can always interrupt generation by pressing Ctrl+C and enter one or more lines of text which will be converted into tokens and appended to the current context. You can also specify a *reverse prompt* with the parameter `-r "reverse prompt string"`. This will result in user input being prompted whenever the exact tokens of the reverse prompt string are encountered in the generation. A typical use is to use a prompt which makes LLaMa emulate a chat between multiple users, say Alice and Bob, and pass `-r "Alice:"`.
+
+Here is an example few-shot interaction, invoked with the command
+```
+./main -m ./models/13B/ggml-model-q4_0.bin -t 8 --repeat_penalty 1.2 --temp 0.9 --top_p 0.9 -n 256 \
+                                           --color -i -r "User:" \
+                                           -p \
+"Transcript of a dialog, where the User interacts with an Assistant named Bob. Bob is helpful, kind, honest, good at writing, and never fails to answer the User's requests immediately and with precision.
+
+User: Hello, Bob.
+Bob: Hello. How may I help you today?
+User: Please tell me the largest city in Europe.
+Bob: Sure. The largest city in Europe is London, the capital of the United Kingdom.
+User:"
+```
+Note the use of `--color` to distinguish between user input and generated text.
+
+![image](https://user-images.githubusercontent.com/401380/224572787-d418782f-47b2-49c4-a04e-65bfa7ad4ec0.png)
+
+
 ## Limitations
 
 - Not sure if my tokenizer is correct. There are a few places where we might have a mistake:

main.cpp

@@ -11,6 +11,18 @@
 #include <string>
 #include <vector>
 
+#include <signal.h>
+#include <unistd.h>
+
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_GREEN   "\x1b[32m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_BLUE    "\x1b[34m"
+#define ANSI_COLOR_MAGENTA "\x1b[35m"
+#define ANSI_COLOR_CYAN    "\x1b[36m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+#define ANSI_BOLD          "\x1b[1m"
+
 // determine number of model parts based on the dimension
 static const std::map<int, int> LLAMA_N_PARTS = {
     { 4096, 1 },
@@ -733,6 +745,18 @@ bool llama_eval(
     return true;
 }
 
+static bool is_interacting = false;
+
+void sigint_handler(int signo) {
+    if (signo == SIGINT) {
+        if (!is_interacting) {
+            is_interacting=true;
+        } else {
+            _exit(130);
+        }
+    }
+}
+
 int main(int argc, char ** argv) {
     ggml_time_init();
     const int64_t t_main_start_us = ggml_time_us();
@@ -787,6 +811,9 @@ int main(int argc, char ** argv) {
 
     params.n_predict = std::min(params.n_predict, model.hparams.n_ctx - (int) embd_inp.size());
 
+    // tokenize the reverse prompt
+    std::vector<gpt_vocab::id> antiprompt_inp = ::llama_tokenize(vocab, params.antiprompt, false);
+
     printf("\n");
     printf("%s: prompt: '%s'\n", __func__, params.prompt.c_str());
     printf("%s: number of tokens in prompt = %zu\n", __func__, embd_inp.size());
@@ -794,6 +821,24 @@ int main(int argc, char ** argv) {
         printf("%6d -> '%s'\n", embd_inp[i], vocab.id_to_token.at(embd_inp[i]).c_str());
     }
     printf("\n");
+    if (params.interactive) {
+        struct sigaction sigint_action;
+        sigint_action.sa_handler = sigint_handler;
+        sigemptyset (&sigint_action.sa_mask);
+        sigint_action.sa_flags = 0; 
+        sigaction(SIGINT, &sigint_action, NULL);
+
+        printf("%s: interactive mode on.\n", __func__);
+
+        if(antiprompt_inp.size()) {
+            printf("%s: reverse prompt: '%s'\n", __func__, params.antiprompt.c_str());
+            printf("%s: number of tokens in reverse prompt = %zu\n", __func__, antiprompt_inp.size());
+            for (int i = 0; i < (int) antiprompt_inp.size(); i++) {
+                printf("%6d -> '%s'\n", antiprompt_inp[i], vocab.id_to_token.at(antiprompt_inp[i]).c_str());
+            }
+            printf("\n");
+        }
+    }
     printf("sampling parameters: temp = %f, top_k = %d, top_p = %f, repeat_last_n = %i, repeat_penalty = %f\n", params.temp, params.top_k, params.top_p, params.repeat_last_n, params.repeat_penalty);
     printf("\n\n");
 
@@ -807,7 +852,28 @@ int main(int argc, char ** argv) {
     std::vector<gpt_vocab::id> last_n_tokens(last_n_size);
     std::fill(last_n_tokens.begin(), last_n_tokens.end(), 0);
 
-    for (int i = embd.size(); i < embd_inp.size() + params.n_predict; i++) {
+
+    if (params.interactive) {
+        printf("== Running in interactive mode. ==\n"
+               " - Press Ctrl+C to interject at any time.\n"
+               " - Press Return to return control to LLaMa.\n"
+               " - If you want to submit another line, end your input in '\\'.\n");
+    }
+
+    int remaining_tokens = params.n_predict;
+    int input_consumed = 0;
+    bool input_noecho = false;
+
+    // prompt user immediately after the starting prompt has been loaded
+    if (params.interactive_start) {
+        is_interacting = true;
+    }
+
+    if (params.use_color) {
+        printf(ANSI_COLOR_YELLOW);
+    }
+
+    while (remaining_tokens > 0) {
         // predict
         if (embd.size() > 0) {
             const int64_t t_start_us = ggml_time_us();
@@ -823,8 +889,8 @@ int main(int argc, char ** argv) {
         n_past += embd.size();
         embd.clear();
 
-        if (i >= embd_inp.size()) {
-            // sample next token
+        if (embd_inp.size() <= input_consumed) {
+            // out of input, sample next token
             const float top_k = params.top_k;
             const float top_p = params.top_p;
             const float temp  = params.temp;
@@ -847,24 +913,74 @@ int main(int argc, char ** argv) {
 
             // add it to the context
             embd.push_back(id);
+
+            // echo this to console
+            input_noecho = false;
+
+            // decrement remaining sampling budget
+            --remaining_tokens;
         } else {
             // if here, it means we are still processing the input prompt
-            for (int k = i; k < embd_inp.size(); k++) {
-                embd.push_back(embd_inp[k]);
+            while (embd_inp.size() > input_consumed) {
+                embd.push_back(embd_inp[input_consumed]);
                 last_n_tokens.erase(last_n_tokens.begin());
-                last_n_tokens.push_back(embd_inp[k]);
+                last_n_tokens.push_back(embd_inp[input_consumed]);
+                ++input_consumed;
                 if (embd.size() > params.n_batch) {
                     break;
                 }
             }
-            i += embd.size() - 1;
+
+            if (params.use_color && embd_inp.size() <= input_consumed) {
+                printf(ANSI_COLOR_RESET);
+            }
         }
 
         // display text
+        if (!input_noecho) {
             for (auto id : embd) {
                 printf("%s", vocab.id_to_token[id].c_str());
             }
             fflush(stdout);
+        }
+
+        // in interactive mode, and not currently processing queued inputs;
+        // check if we should prompt the user for more
+        if (params.interactive && embd_inp.size() <= input_consumed) {
+            // check for reverse prompt
+            if (antiprompt_inp.size() && std::equal(antiprompt_inp.rbegin(), antiprompt_inp.rend(), last_n_tokens.rbegin())) {
+                // reverse prompt found
+                is_interacting = true;
+            }
+            if (is_interacting) {
+                // currently being interactive 
+                bool another_line=true;
+                while (another_line) {
+                    char buf[256] = {0};
+                    int n_read;
+                    if(params.use_color) printf(ANSI_BOLD ANSI_COLOR_GREEN);
+                    scanf("%255[^\n]%n%*c", buf, &n_read);
+                    if(params.use_color) printf(ANSI_COLOR_RESET);
+
+                    if (n_read > 0 && buf[n_read-1]=='\\') {
+                        another_line = true;
+                        buf[n_read-1] = '\n';
+                        buf[n_read] = 0;
+                    } else {
+                        another_line = false;
+                        buf[n_read] = '\n';
+                        buf[n_read+1] = 0;
+                    }
+
+                    std::vector<gpt_vocab::id> line_inp = ::llama_tokenize(vocab, buf, false);
+                    embd_inp.insert(embd_inp.end(), line_inp.begin(), line_inp.end());
+
+                    input_noecho = true; // do not echo this again
+                }
+
+                is_interacting = false;            
+            }
+        }
 
         // end of text token
         if (embd.back() == 2) {
@@ -873,6 +989,7 @@ int main(int argc, char ** argv) {
         }
     }
 
+
     // report timing
     {
         const int64_t t_main_end_us = ggml_time_us();

utils.cpp

@@ -49,6 +49,15 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
             params.n_batch = std::stoi(argv[++i]);
         } else if (arg == "-m" || arg == "--model") {
             params.model = argv[++i];
+        } else if (arg == "-i" || arg == "--interactive") {
+            params.interactive = true;
+        } else if (arg == "--interactive-start") {
+            params.interactive = true;
+            params.interactive_start = true;
+        } else if (arg == "--color") {
+            params.use_color = true;
+        } else if (arg == "-r" || arg == "--reverse-prompt") {
+            params.antiprompt = argv[++i];
         } else if (arg == "-h" || arg == "--help") {
             gpt_print_usage(argc, argv, params);
             exit(0);
@@ -67,6 +76,11 @@ void gpt_print_usage(int argc, char ** argv, const gpt_params & params) {
     fprintf(stderr, "\n");
     fprintf(stderr, "options:\n");
     fprintf(stderr, "  -h, --help            show this help message and exit\n");
+    fprintf(stderr, "  -i, --interactive     run in interactive mode\n");
+    fprintf(stderr, "  --interactive-start   run in interactive mode and poll user input at startup\n");
+    fprintf(stderr, "  -r PROMPT, --reverse-prompt PROMPT\n");
+    fprintf(stderr, "                        in interactive mode, poll user input upon seeing PROMPT\n");
+    fprintf(stderr, "  --color               colorise output to distinguish prompt and user input from generations\n");
     fprintf(stderr, "  -s SEED, --seed SEED  RNG seed (default: -1)\n");
     fprintf(stderr, "  -t N, --threads N     number of threads to use during computation (default: %d)\n", params.n_threads);
     fprintf(stderr, "  -p PROMPT, --prompt PROMPT\n");

utils.h

@@ -28,6 +28,12 @@ struct gpt_params {
 
     std::string model = "models/lamma-7B/ggml-model.bin"; // model path
     std::string prompt;
+
+    bool use_color = false; // use color to distinguish generations and inputs
+
+    bool interactive = false; // interactive mode
+    bool interactive_start = false; // reverse prompt immediately
+    std::string antiprompt = ""; // string upon seeing which more user input is prompted
 };
 
 bool gpt_params_parse(int argc, char ** argv, gpt_params & params);