ECE 408 sem project
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//-----------------------------------------------------------------------------------------------
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// Copyright (c) 2024 Andrej Karpathy
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// Licensed under the MIT License. See the LICENSE file for details.
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//
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// Modifications Copyright (c) 2025 Hanwen Liu, Hrishi Shah, Kelin Zeng, Charles Pei, and Vijay Daita, ALL RIGHTS RESERVED.
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//-----------------------------------------------------------------------------------------------
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#include <cstring>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <time.h>
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#include <assert.h>
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#include <float.h>
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#include <string.h>
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#include <unistd.h>
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// GPU / CUDA related
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#include <cublas_v2.h>
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#include <cuda_runtime.h>
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#include "utils/utils.h"
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#include "utils/tokenizer.h"
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#include "utils/cuda_utils.cuh"
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#include "gpt2.cuh"
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const char *generation_output_filename = "generation_outputs.txt";
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const char *checkpoint_file = "/work/hdd/bche/Project_GPT/gpt2_124M.bin";
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#define SEQUENCE_GENERATION_BATCH_SIZE 1 /* 1 for sequence generation */
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#define TEMPERATURE 0.7 /* Should be > 0 */
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ HELPER FUNCTIONS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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void get_substring_up_to_space(char *input, char *output) {
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char *space_pos = strchr(input + 1, ' ');
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if (space_pos != NULL) {
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size_t length = space_pos - input;
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strncpy(output, input, length);
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// null-terminate output
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output[length] = '\0';
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} else {
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// if no space, copy the entire string
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strcpy(output, input);
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}
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}
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int* tokenizer_encode(Tokenizer *tokenizer, const char *input_str, int *num_tokens) {
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if (tokenizer->init_ok == 0) {
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*num_tokens = 0;
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return NULL;
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}
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// arbitrary initial number of tokens
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int max_tokens = 128;
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int *tokens = (int*)mallocCheck(max_tokens * sizeof(int));
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int token_count = 0;
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char temp_str[strlen(input_str) + 1];
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strcpy(temp_str, input_str);
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// pointer to keep track of the remaining string to process
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char *remaining_input_str = temp_str;
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while (*remaining_input_str != '\0') {
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char to_search[100];
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get_substring_up_to_space(remaining_input_str, to_search);
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size_t token_len = strlen(to_search);
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// try to find longest matching token from the token_table (not perfect, but probably good enough heuristic)
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int best_token = -1;
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int best_token_length = -1;
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for (int i = 0; i < tokenizer->vocab_size; ++i) {
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const char *token = tokenizer->token_table[i];
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int tokenlen = strlen(token);
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if (strncmp(to_search, token, tokenlen) == 0) {
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if (tokenlen > best_token_length) {
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best_token_length = tokenlen;
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best_token = i;
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}
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}
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}
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assert(best_token != 0);
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tokens[token_count++] = best_token;
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// move the pointer ahead by the length of the token
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remaining_input_str += best_token_length;
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// if reached current tokens array capacity, resize
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if (token_count >= max_tokens) {
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// double the capacity
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max_tokens *= 2;
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tokens = (int*)realloc(tokens, max_tokens * sizeof(int));
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if (!tokens) {
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fprintf(stderr, "next_token_gen - Memory allocation failed during token array resizing.\n");
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exit(EXIT_FAILURE);
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}
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}
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}
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*num_tokens = token_count;
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return tokens;
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}
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int return_random_token(int vocab_size) {
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int lower_bound = 0;
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int upper_bound = vocab_size - 1;
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return rand() % (upper_bound - lower_bound + 1) + lower_bound;
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}
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int sample_next_token_temperature(const float* logits, int vocab_size, float temperature) {
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// find max logit, to be used for numerical stability
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float max_logit = -FLT_MAX;
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for (int i = 0; i < vocab_size; i++) {
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if (logits[i] > max_logit) {
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max_logit = logits[i];
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}
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}
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float norm = 0.0f;
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float* probabilities = (float*)mallocCheck(vocab_size * sizeof(float));
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// compute probabilities using softmax with numerical stability and temperature
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for (int i = 0; i < vocab_size; i++) {
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probabilities[i] = expf((logits[i] - max_logit) / temperature);
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norm += probabilities[i];
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}
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// normalize
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for (int i = 0; i < vocab_size; i++) {
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probabilities[i] /= norm;
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}
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// sample from distribution
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float random_value = (float)rand() / RAND_MAX;
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float cumulative = 0.0f;
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for (int i = 0; i < vocab_size; ++i) {
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cumulative += probabilities[i];
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if (random_value < cumulative) {
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free(probabilities);
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return i;
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}
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}
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free(probabilities);
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// default fallback
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return vocab_size - 1; // return last token in vocab
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// return return_random_token(vocab_size); // return a random token in vocab
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}
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void append_to_file(const char *filename, const char *string_to_append) {
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FILE *file = fopenCheck(filename, "a");
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if (file == NULL) {
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perror("next_token_gen - Error opening file");
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exit(EXIT_FAILURE);
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}
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fprintf(file, "%s", string_to_append);
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fclose(file);
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}
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void log_generation_output(const char* input_sequence, const char* output_text) {
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append_to_file(generation_output_filename, "next_token_gen - INPUT TEXT:\n");
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append_to_file(generation_output_filename, input_sequence);
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append_to_file(generation_output_filename, "\n\nGENERATED TEXT:\n");
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append_to_file(generation_output_filename, output_text);
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append_to_file(generation_output_filename, "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n");
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}
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/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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void gpt2_generate_next_token(GPT2* model, int* input_tokens, int input_length, int* output_token) {
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assert(input_length <= model->config.max_seq_len);
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int padded_input_length = (input_length + 3) / 4 * 4;
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int * gpt_input = (int *)mallocCheck(padded_input_length * sizeof(int));
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memcpy(gpt_input, input_tokens, input_length * sizeof(int));
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if (padded_input_length - input_length > 0)
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memset(gpt_input + input_length, 0, (padded_input_length - input_length) * sizeof(int));
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gpt2_forward(model, gpt_input, SEQUENCE_GENERATION_BATCH_SIZE, padded_input_length);
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float* logits_gpu = (model->acts.output) + (input_length - 1) * model->config.padded_vocab_size;
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float* logits_cpu = (float*)mallocCheck(model->config.vocab_size * sizeof(float));
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// move logits back to CPU and sample (note we only move the first vocab_size logits, ignoring the padding)
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cudaCheck(cudaMemcpy(logits_cpu, logits_gpu, model->config.vocab_size * sizeof(float), cudaMemcpyDeviceToHost));
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*output_token = sample_next_token_temperature(logits_cpu, model->config.vocab_size, TEMPERATURE);
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free(logits_cpu);
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}
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void gpt2_generate_text(GPT2* model, const char* input_sequence, int max_gen_length, char* output_text) {
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Tokenizer tokenizer;
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tokenizer_init(&tokenizer, "/work/hdd/bche/Project_GPT/gpt2_tokenizer.bin");
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int num_input_tokens = 0;
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int* input_tokens = tokenizer_encode(&tokenizer, input_sequence, &num_input_tokens);
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printf("next_token_gen - number of input tokens: %d\n", num_input_tokens);
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for (int i = 0; i < num_input_tokens; i++) {
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printf("%d ", input_tokens[i]);
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}
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// the model's response is actually at generated_sequence + num_input_tokens
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int* generated_sequence = (int*)mallocCheck((num_input_tokens + max_gen_length) * sizeof(int));
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memcpy(generated_sequence, input_tokens, num_input_tokens * sizeof(int));
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// seq_len_itr accounts for the number of input tokens
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// i.e. put new tokens into this index due to 0-indexing
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int seq_len_itr = num_input_tokens;
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// if you want to include prompt in generated output text string
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// strcpy(output_text, input_sequence);
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for (int i = 0; i < max_gen_length; ++i) {
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int next_token;
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gpt2_generate_next_token(model, generated_sequence, seq_len_itr, &next_token);
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if (seq_len_itr < model->config.max_seq_len) {
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generated_sequence[seq_len_itr] = next_token;
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seq_len_itr += 1;
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}
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}
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// this should not be segfaulting if max_gen_length number of tokens were generated properly
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for (int i = num_input_tokens; i < num_input_tokens + max_gen_length; ++i) {
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// decode the token and append to output text
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const char* next_token_str = tokenizer_decode(&tokenizer, generated_sequence[i]);
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strcat(output_text, next_token_str);
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}
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free(input_tokens);
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free(generated_sequence);
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tokenizer_free(&tokenizer);
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}
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int main(int argc, char** argv) {
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if (argc < 2) {
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printf("next_token_gen - Usage: %s \"<input sequence>\"\n", argv[0]);
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return EXIT_FAILURE;
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}
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srand(time(NULL));
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// setup cuBLAS and cuBLASLt
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cublasCheck(cublasCreate(&cublas_handle));
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// TF32 precision is equivalent to torch.set_float32_matmul_precision('high')
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int enable_tf32 = 0;
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cublas_compute_type = enable_tf32 ? CUBLAS_COMPUTE_32F_FAST_TF32 : CUBLAS_COMPUTE_32F;
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cublasMath_t cublas_math_mode = enable_tf32 ? CUBLAS_TF32_TENSOR_OP_MATH : CUBLAS_DEFAULT_MATH;
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cublasCheck(cublasSetMathMode(cublas_handle, cublas_math_mode));
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GPT2 model;
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gpt2_build_from_checkpoint(&model, checkpoint_file);
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printf("+-----------------------+\n");
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printf("| GPT2 MODEL PARAMETERS |\n");
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printf("+-----------------------+----------------------------------------------------+\n");
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printf("| max_sequence_length T | %-50d |\n", model.config.max_seq_len);
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printf("| vocab_size V | %-50d |\n", model.config.vocab_size);
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printf("| padded_vocab_size Vp | %-50d |\n", model.config.padded_vocab_size);
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printf("| num_layers L | %-50d |\n", model.config.num_layers);
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printf("| num_heads NH | %-50d |\n", model.config.num_heads);
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printf("| channels C | %-50d |\n", model.config.channels);
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printf("| num_parameters | %-50zu |\n", model.num_parameters);
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printf("+-----------------------+----------------------------------------------------+\n");
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// max_gen_length DOES NOT account for the input sequence length
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// 500 runs out of memory
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int max_gen_length = 50;
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const char* input_sequence = argv[1];
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char output_text[4096] = {0};
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struct timespec start, end;
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clock_gettime(CLOCK_MONOTONIC, &start);
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gpt2_generate_text(&model, input_sequence, max_gen_length, output_text);
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clock_gettime(CLOCK_MONOTONIC, &end);
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double time_elapsed_s = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) / 1e9;
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printf("+----------+\n");
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printf("| GPT2 RUN |\n");
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printf("+----------+----------------------------------------------------------------------------------------------------------------------------------+\n");
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printf("|\n| INPUT TEXT: %s\n", input_sequence);
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printf("|\n| GENERATED TEXT: %s\n", output_text);
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printf("|\n| TIME FOR INFERENCING: %f ms\n", time_elapsed_s * 1000);
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printf("|\n| # TOKENS/SEC: %.3f\n", max_gen_length / time_elapsed_s);
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printf("+---------------------------------------------------------------------------------------------------------------------------------------------+\n");
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log_generation_output(input_sequence, output_text);
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return EXIT_SUCCESS;
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}
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