From 8a88e5855c3b93024be0f93290b01a4206b65b38 Mon Sep 17 00:00:00 2001 From: klosax <131523366+klosax@users.noreply.github.com> Date: Fri, 28 Jul 2023 20:25:36 +0200 Subject: [PATCH] perplexity : add Hellaswag calculation (#2389) * common.h : add hellaswag / remove perplexity-lines * common.cpp : add hellaswag / remove perplexity-lines * perplexity.cpp : add hellswag scores / remove perplexity-lines * perplexity.cpp : clean up * common.h : change default param value * common.cpp : Change default param * perplexity.cpp : alter wording * common.h : alter wording * common.cpp : alter wording --- examples/common.cpp | 15 ++- examples/common.h | 6 +- examples/perplexity/perplexity.cpp | 185 ++++++++++++++++++++++------- 3 files changed, 158 insertions(+), 48 deletions(-) diff --git a/examples/common.cpp b/examples/common.cpp index dd964c8a7..fe7308b17 100644 --- a/examples/common.cpp +++ b/examples/common.cpp @@ -402,8 +402,14 @@ bool gpt_params_parse(int argc, char ** argv, gpt_params & params) { params.antiprompt.push_back(argv[i]); } else if (arg == "--perplexity") { params.perplexity = true; - } else if (arg == "--perplexity-lines") { - params.perplexity_lines = true; + } else if (arg == "--hellaswag") { + params.hellaswag = true; + } else if (arg == "--hellaswag-tasks") { + if (++i >= argc) { + invalid_param = true; + break; + } + params.hellaswag_tasks = std::stoi(argv[i]); } else if (arg == "--ignore-eos") { params.logit_bias[llama_token_eos()] = -INFINITY; } else if (arg == "--no-penalize-nl") { @@ -559,8 +565,9 @@ void gpt_print_usage(int /*argc*/, char ** argv, const gpt_params & params) { fprintf(stdout, " not recommended: doubles context memory required and no measurable increase in quality\n"); fprintf(stdout, " --temp N temperature (default: %.1f)\n", (double)params.temp); fprintf(stdout, " --perplexity compute perplexity over each ctx window of the prompt\n"); - fprintf(stdout, " --perplexity-lines compute perplexity over each line of the prompt\n"); - fprintf(stdout, " --keep number of tokens to keep from the initial prompt (default: %d, -1 = all)\n", params.n_keep); + fprintf(stdout, " --hellaswag compute HellaSwag score over random tasks from datafile supplied with -f\n"); + fprintf(stdout, " --hellaswag-tasks N number of tasks to use when computing the HellaSwag score (default: %d)\n", params.hellaswag_tasks); + fprintf(stdout, " --keep N number of tokens to keep from the initial prompt (default: %d, -1 = all)\n", params.n_keep); fprintf(stdout, " --chunks N max number of chunks to process (default: %d, -1 = all)\n", params.n_chunks); if (llama_mlock_supported()) { fprintf(stdout, " --mlock force system to keep model in RAM rather than swapping or compressing\n"); diff --git a/examples/common.h b/examples/common.h index 672dcf77c..1184f32df 100644 --- a/examples/common.h +++ b/examples/common.h @@ -70,7 +70,10 @@ struct gpt_params { std::string lora_adapter = ""; // lora adapter path std::string lora_base = ""; // base model path for the lora adapter - bool low_vram = false; // if true, reduce VRAM usage at the cost of performance + bool hellaswag = false; // compute HellaSwag score over random tasks from datafile supplied in prompt + size_t hellaswag_tasks = 400; // number of tasks to use when computing the HellaSwag score + + bool low_vram = false; // if true, reduce VRAM usage at the cost of performance bool memory_f16 = true; // use f16 instead of f32 for memory kv bool random_prompt = false; // do not randomize prompt if none provided bool use_color = false; // use color to distinguish generations and inputs @@ -86,7 +89,6 @@ struct gpt_params { bool instruct = false; // instruction mode (used for Alpaca models) bool penalize_nl = true; // consider newlines as a repeatable token bool perplexity = false; // compute perplexity over the prompt - bool perplexity_lines = false; // compute perplexity over each line of the prompt bool use_mmap = true; // use mmap for faster loads bool use_mlock = false; // use mlock to keep model in memory bool mem_test = false; // compute maximum memory usage diff --git a/examples/perplexity/perplexity.cpp b/examples/perplexity/perplexity.cpp index d23b7e7f0..6870a11b9 100644 --- a/examples/perplexity/perplexity.cpp +++ b/examples/perplexity/perplexity.cpp @@ -121,8 +121,23 @@ void perplexity(llama_context * ctx, const gpt_params & params) { printf("\n"); } -void perplexity_lines(llama_context * ctx, const gpt_params & params) { - // Calculates perplexity over each line of the prompt +void hellaswag_score(llama_context * ctx, const gpt_params & params) { + // Calculates hellaswag score (acc_norm) from prompt + // + // Data extracted from the HellaSwag validation dataset (MIT license) https://github.com/rowanz/hellaswag/blob/master/data/hellaswag_val.jsonl + // All used data fields are preprocessed as in https://github.com/EleutherAI/lm-evaluation-harness/blob/df3da98c5405deafd519c2ddca52bb7c3fe36bef/lm_eval/tasks/hellaswag.py#L62-L68 + // + // All 10042 tasks should be extracted to keep the results standardized like other implementations. + // + // Datafile layout: + // ['??'] denotes json fields + // 6 lines per task: + // ['activity_label'] + ": " +['ctx'] - The first part of the query, the context + // ['label'] - The index the best common sense ending aka gold ending + // ['endings'][0] - Endings added to the first part of the query + // ['endings'][1] + // ['endings'][2] + // ['endings'][3] std::vector prompt_lines; std::istringstream strstream(params.prompt); @@ -132,63 +147,149 @@ void perplexity_lines(llama_context * ctx, const gpt_params & params) { prompt_lines.push_back(line); } + if( prompt_lines.size() % 6 != 0) { + fprintf(stderr, "%s : number of lines in prompt not a multiple of 6.\n", __func__); + return; + } + + size_t hs_task_count = prompt_lines.size()/6; + fprintf(stderr, "%s : loaded %lu tasks from prompt.\n", __func__, hs_task_count); + + // This is needed as usual for LLaMA models + bool prepend_bos = true; + + // Number of tasks to use when computing the score + if ( params.hellaswag_tasks < hs_task_count ) { + hs_task_count = params.hellaswag_tasks; + } + + // The tasks should be randomized so the score stabilizes quickly. + bool randomize_tasks = true; + + // The random seed should not impact the final result if the computation is done over enough tasks, so kept hardcoded for now + std::mt19937 rng(1); + + // Dataholder for hellaswag tasks + struct hs_data_t { + std::string context; + size_t gold_ending_idx; + std::string ending[4]; + size_t ending_logprob_count[4]; + double ending_logprob[4]; + }; + + fprintf(stderr, "%s : selecting %lu %s tasks.\n", __func__, hs_task_count, (randomize_tasks?"randomized":"the first") ); + + // Select and read data from prompt lines + hs_data_t *hs_data = new hs_data_t[hs_task_count]; + for (size_t i=0; i < hs_task_count; i++) { + size_t idx = i; + + // Select a random example of those left in the prompt + if (randomize_tasks) { + std::uniform_int_distribution dist(0, prompt_lines.size()/6-1 ) ; + idx = dist(rng); + } + + hs_data[i].context = prompt_lines[idx*6]; + hs_data[i].gold_ending_idx = std::stoi( prompt_lines[idx*6+1] ); + for (size_t j=0; j < 4; j++) { + hs_data[i].ending[j] = " " + prompt_lines[idx*6+2+j]; + } + + // Delete the selected random example from the prompt + if (randomize_tasks) { + prompt_lines.erase( std::next(prompt_lines.begin(),idx*6) , std::next(prompt_lines.begin(),idx*6+6) ); + } + } + + fprintf(stderr, "%s : calculating hellaswag score over selected tasks.\n", __func__); + printf("\ntask\tacc_norm\n"); + + double acc = 0.0f; const int n_vocab = llama_n_vocab(ctx); - int counttotal = 0; - size_t n_lines = prompt_lines.size(); + for (size_t task_idx = 0; task_idx < hs_task_count; task_idx++) { - double nll = 0.0; + // Tokenize the context to count tokens + std::vector context_embd = ::llama_tokenize(ctx, hs_data[task_idx].context, prepend_bos); + size_t context_size = context_embd.size(); - fprintf(stderr, "%s: calculating perplexity over %lu lines\n", __func__, n_lines); + for (size_t ending_idx=0;ending_idx<4;ending_idx++) { - printf("\nLine\tPPL line\tPPL cumulative\n"); + // Tokenize the query + std::vector query_embd = ::llama_tokenize(ctx, hs_data[task_idx].context + hs_data[task_idx].ending[ending_idx], prepend_bos); + size_t query_size = query_embd.size(); - for (size_t i = 0; i < n_lines; ++i) { + // Stop if query wont fit the ctx window + if (query_size > (size_t)params.n_ctx) { + fprintf(stderr, "%s : number of tokens in query %lu > n_ctxl\n", __func__, query_size); + return; + } - // Tokenize and insert BOS at start - std::vector batch_embd = ::llama_tokenize(ctx, prompt_lines[i], true); + // Speedup small evaluations by evaluating atleast 32 tokens + if (query_size < 32) { + query_embd.resize(32); + } - size_t batch_size = batch_embd.size(); + // Evaluate the query + if (llama_eval(ctx, query_embd.data(), query_embd.size(), 0, params.n_threads)) { + fprintf(stderr, "%s : failed to eval\n", __func__); + return; + } - // Stop if line is too long - if( batch_size > (size_t)params.n_ctx ) { - fprintf(stderr, "%s : tokens in line %lu > n_ctxl\n", __func__, i); - return; + const auto query_logits = llama_get_logits(ctx); + std::vector logits; + logits.insert(logits.end(), query_logits, query_logits + query_size * n_vocab); + + hs_data[task_idx].ending_logprob_count[ending_idx] = 0; + hs_data[task_idx].ending_logprob[ending_idx] = 0.0f; + + // Calculate the logprobs over the ending + for (size_t j = context_size-1; j < query_size - 1; j++) { + // Calculate probability of next token, given the previous ones. + const std::vector tok_logits( + logits.begin() + (j + 0) * n_vocab, + logits.begin() + (j + 1) * n_vocab); + + const float prob = softmax(tok_logits)[query_embd[ j + 1]]; + + hs_data[task_idx].ending_logprob[ending_idx] += std::log(prob); + hs_data[task_idx].ending_logprob_count[ending_idx]++; + } + + // Calculate the mean token logprob for acc_norm + hs_data[task_idx].ending_logprob[ending_idx] /= hs_data[task_idx].ending_logprob_count[ending_idx]; + + +// printf("task %lu, ending %lu, whole_len %lu, context_len %lu, ending_logprob_count %lu, ending_logprob %.4f\n", +// task_idx,ending_idx,whole_size,context_size, hs_data[task_idx].ending_logprob_count[ending_idx], hs_data[task_idx].ending_logprob[ending_idx] ); } - if (llama_eval(ctx, batch_embd.data(), batch_size, 0, params.n_threads)) { - fprintf(stderr, "%s : failed to eval\n", __func__); - return; + // Find the ending with maximum logprob + size_t ending_logprob_max_idx = -1; + double ending_logprob_max_val = -INFINITY; + for (size_t j=0; j < 4; j++) { + if (hs_data[task_idx].ending_logprob[j] > ending_logprob_max_val) { + ending_logprob_max_idx = j; + ending_logprob_max_val = hs_data[task_idx].ending_logprob[j]; + } } - const auto batch_logits = llama_get_logits(ctx); - std::vector logits; - logits.insert(logits.end(), batch_logits, batch_logits + batch_size * n_vocab); +// printf("max logprob ending idx %lu, gold ending idx %lu\n", ending_logprob_max_idx, hs_data[task_idx].gold_ending_idx); - double nllline = 0.0; - int countline = 0; - - // Perplexity over second half of the line - for (size_t j = batch_size/2; j < batch_size - 1; ++j) { - // Calculate probability of next token, given the previous ones. - const std::vector tok_logits( - logits.begin() + (j + 0) * n_vocab, - logits.begin() + (j + 1) * n_vocab); - - const float prob = softmax(tok_logits)[batch_embd[ j + 1]]; - - nllline += -std::log(prob); - ++countline; + // If the gold ending got the maximum logprobe add one accuracy point + if (ending_logprob_max_idx == hs_data[task_idx].gold_ending_idx) { + acc += 1.0; } - nll += nllline; - counttotal += countline; - - // perplexity is e^(average negative log-likelihood) - printf("%lu\t%.8lf\t%.8lf\n", i + 1, std::exp(nllline/countline), std::exp(nll / counttotal) ); + // Print the accumulated accuracy mean x 100 + printf("%li\t%.8lf\n",task_idx+1, acc/double(task_idx+1)*100.0); fflush(stdout); } + delete [] hs_data; + printf("\n"); } @@ -240,8 +341,8 @@ int main(int argc, char ** argv) { params.n_threads, std::thread::hardware_concurrency(), llama_print_system_info()); } - if (params.perplexity_lines) { - perplexity_lines(ctx, params); + if (params.hellaswag) { + hellaswag_score(ctx, params); } else { perplexity(ctx, params); }