llama : new sampling algorithms (#1126)
* Sample interface, new samplers. New samplers: - locally typical sampling - tail free sampling - frequency and presence penalty - mirostat Ignore EOS fix: -inf should be used. * mirostat * Added --logit-bias and --no-penalize-nl, removed std::span * Use C++11, clarify llama API documentation, rename Mirostat parameters to --mirostat_lr and --mirostat_ent, add temperature sampling for Mirostat, simplify Mirostat sampling API parameters (removed N and *k) Use C++11, clarify llama API documentation, rename Mirostat parameters to --mirostat_lr and --mirostat_ent, add temperature sampling for Mirostat, simplify Mirostat sampling API parameters (removed N and *k) * Save and load example adjust * Tests * Windows build fix * Windows test fix
This commit is contained in:
Ivan Stepanov
GitHub
parent
7fc50c051a
commit
dd7eff57d8
8 changed files with 812 additions and 160 deletions
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@ -6,6 +6,8 @@
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#include <string>
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#include <iterator>
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#include <algorithm>
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#include <sstream>
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#include <iostream>
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#if defined (_WIN32)
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#include <fcntl.h>
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@ -114,6 +116,18 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
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break;
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}
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params.temp = std::stof(argv[i]);
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} else if (arg == "--tfs") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.tfs_z = std::stof(argv[i]);
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} else if (arg == "--typical") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.typical_p = std::stof(argv[i]);
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} else if (arg == "--repeat_last_n") {
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if (++i >= argc) {
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invalid_param = true;
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@ -126,6 +140,36 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
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break;
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}
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params.repeat_penalty = std::stof(argv[i]);
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} else if (arg == "--frequency_penalty") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.frequency_penalty = std::stof(argv[i]);
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} else if (arg == "--presence_penalty") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.presence_penalty = std::stof(argv[i]);
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} else if (arg == "--mirostat") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.mirostat = std::stoi(argv[i]);
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} else if (arg == "--mirostat_lr") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.mirostat_eta = std::stof(argv[i]);
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} else if (arg == "--mirostat_ent") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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params.mirostat_tau = std::stof(argv[i]);
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} else if (arg == "-b" || arg == "--batch_size") {
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if (++i >= argc) {
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invalid_param = true;
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@ -185,7 +229,28 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) {
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} else if (arg == "--perplexity") {
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params.perplexity = true;
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} else if (arg == "--ignore-eos") {
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params.ignore_eos = true;
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params.logit_bias[llama_token_eos()] = -INFINITY;
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} else if (arg == "--no-penalize-nl") {
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params.penalize_nl = false;
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} else if (arg == "-l" || arg == "--logit-bias") {
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if (++i >= argc) {
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invalid_param = true;
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break;
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}
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std::stringstream ss(argv[i]);
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llama_token key;
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char sign;
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std::string value_str;
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try {
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if (ss >> key && ss >> sign && std::getline(ss, value_str) && (sign == '+' || sign == '-')) {
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params.logit_bias[key] = std::stof(value_str) * ((sign == '-') ? -1.0f : 1.0f);
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} else {
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throw std::exception();
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}
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} catch (const std::exception &e) {
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invalid_param = true;
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break;
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}
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} else if (arg == "--n_parts") {
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if (++i >= argc) {
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invalid_param = true;
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@ -240,12 +305,26 @@ void gpt_print_usage(int /*argc*/, char ** argv, const gpt_params & params) {
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fprintf(stderr, " -f FNAME, --file FNAME\n");
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fprintf(stderr, " prompt file to start generation.\n");
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fprintf(stderr, " -n N, --n_predict N number of tokens to predict (default: %d, -1 = infinity)\n", params.n_predict);
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fprintf(stderr, " --top_k N top-k sampling (default: %d)\n", params.top_k);
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fprintf(stderr, " --top_p N top-p sampling (default: %.1f)\n", (double)params.top_p);
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fprintf(stderr, " --repeat_last_n N last n tokens to consider for penalize (default: %d)\n", params.repeat_last_n);
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fprintf(stderr, " --repeat_penalty N penalize repeat sequence of tokens (default: %.1f)\n", (double)params.repeat_penalty);
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fprintf(stderr, " --top_k N top-k sampling (default: %d, 0 = disabled)\n", params.top_k);
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fprintf(stderr, " --top_p N top-p sampling (default: %.1f, 1.0 = disabled)\n", (double)params.top_p);
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fprintf(stderr, " --tfs N tail free sampling, parameter z (default: %.1f, 1.0 = disabled)\n", (double)params.tfs_z);
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fprintf(stderr, " --typical N locally typical sampling, parameter p (default: %.1f, 1.0 = disabled)\n", (double)params.typical_p);
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fprintf(stderr, " --repeat_last_n N last n tokens to consider for penalize (default: %d, 0 = disabled, -1 = ctx_size)\n", params.repeat_last_n);
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fprintf(stderr, " --repeat_penalty N penalize repeat sequence of tokens (default: %.1f, 1.0 = disabled)\n", (double)params.repeat_penalty);
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fprintf(stderr, " --presence_penalty N repeat alpha presence penalty (default: %.1f, 0.0 = disabled)\n", (double)params.presence_penalty);
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fprintf(stderr, " --frequency_penalty N repeat alpha frequency penalty (default: %.1f, 0.0 = disabled)\n", (double)params.frequency_penalty);
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fprintf(stderr, " --mirostat N use Mirostat sampling.\n");
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fprintf(stderr, " Top K, Nucleus, Tail Free and Locally Typical samplers are ignored if used.\n");
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fprintf(stderr, " (default: %d, 0 = disabled, 1 = Mirostat, 2 = Mirostat 2.0)\n", params.mirostat);
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fprintf(stderr, " --mirostat_lr N Mirostat learning rate, parameter eta (default: %.1f)\n", (double)params.mirostat_eta);
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fprintf(stderr, " --mirostat_ent N Mirostat target entropy, parameter tau (default: %.1f)\n", (double)params.mirostat_tau);
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fprintf(stderr, " -l TOKEN_ID(+/-)BIAS, --logit-bias TOKEN_ID(+/-)BIAS\n");
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fprintf(stderr, " modifies the likelihood of token appearing in the completion,\n");
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fprintf(stderr, " i.e. `--logit-bias 15043+1` to increase likelihood of token ' Hello',\n");
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fprintf(stderr, " or `--logit-bias 15043-1` to decrease likelihood of token ' Hello'\n");
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fprintf(stderr, " -c N, --ctx_size N size of the prompt context (default: %d)\n", params.n_ctx);
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fprintf(stderr, " --ignore-eos ignore end of stream token and continue generating\n");
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fprintf(stderr, " --ignore-eos ignore end of stream token and continue generating (implies --logit-bias 2-inf)\n");
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fprintf(stderr, " --no-penalize-nl do not penalize newline token\n");
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fprintf(stderr, " --memory_f32 use f32 instead of f16 for memory key+value\n");
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fprintf(stderr, " --temp N temperature (default: %.1f)\n", (double)params.temp);
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fprintf(stderr, " --n_parts N number of model parts (default: -1 = determine from dimensions)\n");
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@ -8,6 +8,7 @@
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#include <vector>
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#include <random>
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#include <thread>
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#include <unordered_map>
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//
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// CLI argument parsing
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@ -17,17 +18,25 @@ struct gpt_params {
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int32_t seed = -1; // RNG seed
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int32_t n_threads = std::min(4, (int32_t) std::thread::hardware_concurrency());
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int32_t n_predict = 128; // new tokens to predict
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int32_t repeat_last_n = 64; // last n tokens to penalize
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int32_t n_parts = -1; // amount of model parts (-1 = determine from model dimensions)
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int32_t n_ctx = 512; // context size
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int32_t n_batch = 512; // batch size for prompt processing (must be >=32 to use BLAS)
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int32_t n_keep = 0; // number of tokens to keep from initial prompt
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// sampling parameters
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int32_t top_k = 40;
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float top_p = 0.95f;
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float temp = 0.80f;
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float repeat_penalty = 1.10f;
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std::unordered_map<llama_token, float> logit_bias; // logit bias for specific tokens
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int32_t top_k = 0; // <= 0 to use vocab size
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float top_p = 1.0f; // 1.0 = disabled
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float tfs_z = 1.0f; // 1.0 = disabled
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float typical_p = 1.0f; // 1.0 = disabled
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float temp = 1.0f; // 1.0 = disabled
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float repeat_penalty = 1.0f; // 1.0 = disabled
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int32_t repeat_last_n = -1; // last n tokens to penalize (0 = disable penalty, -1 = context size)
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float frequency_penalty = 0.0f; // 0.0 = disabled
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float presence_penalty = 0.0f; // 0.0 = disabled
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int mirostat = 0; // 0 = disabled, 1 = mirostat, 2 = mirostat 2.0
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float mirostat_tau = 5.0f; // target entropy
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float mirostat_eta = 0.1f; // learning rate
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std::string model = "models/lamma-7B/ggml-model.bin"; // model path
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std::string prompt = "";
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@ -47,7 +56,7 @@ struct gpt_params {
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bool interactive_first = false; // wait for user input immediately
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bool instruct = false; // instruction mode (used for Alpaca models)
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bool ignore_eos = false; // do not stop generating after eos
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bool penalize_nl = true; // consider newlines as a repeatable token
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bool perplexity = false; // compute perplexity over the prompt
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bool use_mmap = true; // use mmap for faster loads
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bool use_mlock = false; // use mlock to keep model in memory
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@ -276,8 +276,8 @@ int main(int argc, char ** argv) {
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fprintf(stderr, "Input prefix: '%s'\n", params.input_prefix.c_str());
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}
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}
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fprintf(stderr, "sampling: temp = %f, top_k = %d, top_p = %f, repeat_last_n = %i, repeat_penalty = %f\n",
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params.temp, params.top_k, params.top_p, params.repeat_last_n, params.repeat_penalty);
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fprintf(stderr, "sampling: repeat_last_n = %d, repeat_penalty = %f, presence_penalty = %f, frequency_penalty = %f, top_k = %d, tfs_z = %f, top_p = %f, typical_p = %f, temp = %f, mirostat = %d, mirostat_lr = %f, mirostat_ent = %f\n",
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params.repeat_last_n, params.repeat_penalty, params.presence_penalty, params.frequency_penalty, params.top_k, params.tfs_z, params.top_p, params.typical_p, params.temp, params.mirostat, params.mirostat_eta, params.mirostat_tau);
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fprintf(stderr, "generate: n_ctx = %d, n_batch = %d, n_predict = %d, n_keep = %d\n", n_ctx, params.n_batch, params.n_predict, params.n_keep);
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fprintf(stderr, "\n\n");
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@ -387,10 +387,19 @@ int main(int argc, char ** argv) {
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if ((int) embd_inp.size() <= n_consumed && !is_interacting) {
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// out of user input, sample next token
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const int32_t top_k = params.top_k;
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const float top_p = params.top_p;
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const float temp = params.temp;
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const int32_t top_k = params.top_k <= 0 ? llama_n_vocab(ctx) : params.top_k;
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const float top_p = params.top_p;
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const float tfs_z = params.tfs_z;
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const float typical_p = params.typical_p;
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const int32_t repeat_last_n = params.repeat_last_n < 0 ? n_ctx : params.repeat_last_n;
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const float repeat_penalty = params.repeat_penalty;
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const float alpha_presence = params.presence_penalty;
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const float alpha_frequency = params.frequency_penalty;
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const int mirostat = params.mirostat;
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const float mirostat_tau = params.mirostat_tau;
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const float mirostat_eta = params.mirostat_eta;
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const bool penalize_nl = params.penalize_nl;
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// optionally save the session on first sample (for faster prompt loading next time)
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if (!path_session.empty() && need_to_save_session) {
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@ -402,14 +411,58 @@ int main(int argc, char ** argv) {
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{
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auto logits = llama_get_logits(ctx);
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auto n_vocab = llama_n_vocab(ctx);
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if (params.ignore_eos) {
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logits[llama_token_eos()] = 0;
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// Apply params.logit_bias map
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for (auto it = params.logit_bias.begin(); it != params.logit_bias.end(); it++) {
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logits[it->first] += it->second;
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}
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id = llama_sample_top_p_top_k(ctx,
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last_n_tokens.data() + n_ctx - params.repeat_last_n,
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params.repeat_last_n, top_k, top_p, temp, repeat_penalty);
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std::vector<llama_token_data> candidates;
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candidates.reserve(n_vocab);
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for (llama_token token_id = 0; token_id < n_vocab; token_id++) {
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candidates.emplace_back(llama_token_data{token_id, logits[token_id], 0.0f});
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}
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llama_token_data_array candidates_p = { candidates.data(), candidates.size(), false };
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// Apply penalties
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float nl_logit = logits[llama_token_nl()];
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auto last_n_repeat = std::min(std::min((int)last_n_tokens.size(), repeat_last_n), n_ctx);
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llama_sample_repetition_penalty(ctx, &candidates_p,
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last_n_tokens.data() + last_n_tokens.size() - last_n_repeat,
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last_n_repeat, repeat_penalty);
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llama_sample_frequency_and_presence_penalties(ctx, &candidates_p,
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last_n_tokens.data() + last_n_tokens.size() - last_n_repeat,
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last_n_repeat, alpha_frequency, alpha_presence);
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if (!penalize_nl) {
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logits[llama_token_nl()] = nl_logit;
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}
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if (temp <= 0) {
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// Greedy sampling
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id = llama_sample_token_greedy(ctx, &candidates_p);
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} else {
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if (mirostat == 1) {
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static float mirostat_mu = 2.0f * mirostat_tau;
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const int mirostat_m = 100;
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llama_sample_temperature(ctx, &candidates_p, temp);
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id = llama_sample_token_mirostat(ctx, &candidates_p, mirostat_tau, mirostat_eta, mirostat_m, &mirostat_mu);
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} else if (mirostat == 2) {
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static float mirostat_mu = 2.0f * mirostat_tau;
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llama_sample_temperature(ctx, &candidates_p, temp);
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id = llama_sample_token_mirostat_v2(ctx, &candidates_p, mirostat_tau, mirostat_eta, &mirostat_mu);
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} else {
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// Temperature sampling
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llama_sample_top_k(ctx, &candidates_p, top_k);
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llama_sample_tail_free(ctx, &candidates_p, tfs_z);
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llama_sample_typical(ctx, &candidates_p, typical_p);
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llama_sample_top_p(ctx, &candidates_p, top_p);
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llama_sample_temperature(ctx, &candidates_p, temp);
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id = llama_sample_token(ctx, &candidates_p);
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}
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}
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// printf("`%d`", candidates_p.size);
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last_n_tokens.erase(last_n_tokens.begin());
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last_n_tokens.push_back(id);
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@ -64,14 +64,15 @@ int main(int argc, char ** argv) {
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// first run
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printf("\n%s", params.prompt.c_str());
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for (auto i = 0; i < params.n_predict; i++) {
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auto next_token = llama_sample_top_p_top_k(
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ctx,
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&last_n_tokens_data.back() - params.repeat_last_n,
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params.repeat_last_n,
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40,
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1.0,
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1.0,
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1.1);
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auto logits = llama_get_logits(ctx);
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auto n_vocab = llama_n_vocab(ctx);
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std::vector<llama_token_data> candidates;
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candidates.reserve(n_vocab);
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for (llama_token token_id = 0; token_id < n_vocab; token_id++) {
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candidates.emplace_back(llama_token_data{token_id, logits[token_id], 0.0f});
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}
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llama_token_data_array candidates_p = { candidates.data(), candidates.size(), false };
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auto next_token = llama_sample_token(ctx, &candidates_p);
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auto next_token_str = llama_token_to_str(ctx, next_token);
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last_n_tokens_data.push_back(next_token);
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printf("%s", next_token_str);
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@ -106,14 +107,15 @@ int main(int argc, char ** argv) {
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// second run
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for (auto i = 0; i < params.n_predict; i++) {
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auto next_token = llama_sample_top_p_top_k(
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ctx2,
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&last_n_tokens_data.back() - params.repeat_last_n,
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params.repeat_last_n,
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40,
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1.0,
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1.0,
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1.1);
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auto logits = llama_get_logits(ctx2);
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auto n_vocab = llama_n_vocab(ctx2);
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std::vector<llama_token_data> candidates;
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candidates.reserve(n_vocab);
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for (llama_token token_id = 0; token_id < n_vocab; token_id++) {
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candidates.emplace_back(llama_token_data{token_id, logits[token_id], 0.0f});
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}
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llama_token_data_array candidates_p = { candidates.data(), candidates.size(), false };
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auto next_token = llama_sample_token(ctx2, &candidates_p);
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auto next_token_str = llama_token_to_str(ctx2, next_token);
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last_n_tokens_data.push_back(next_token);
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printf("%s", next_token_str);
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