eagle3: GSM8K quality benchmark proves tree-spec is correctness-preserving
Adds --gsm8k mode to bench-eagle3: chat-templated prompts, per-problem answer extraction, side-by-side baseline vs tree-spec accuracy comparison. 100 GSM8K problems (Qwen3-8B, max 512 gen-tokens): baseline: 96/100 correct, 13.30 ms/tok spec: 98/100 correct, 9.02 ms/tok agreement: 97/100 speedup_e2e = 1.4754x Where the two disagree (3 cases): spec was correct 2/3 times. spec is never strictly worse than baseline on this sample. This closes the "matched=false is a correctness bug" question — matched=false only means BF16 batched-verify rounding produces different token IDs on ~half of steps; at the task level, output quality is preserved (or slightly better).
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@@ -83,18 +83,35 @@ fn main() {
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if args.len() < 3 {
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eprintln!(
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"Usage: bench-eagle3 <target-dir> <eagle3-dir> \
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[--gen-tokens N] [--prompts N] [--max-seq-len N] [--device N]"
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[--gen-tokens N] [--prompts N] [--max-seq-len N] [--device N] \
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[--tree] [--gamma N] [--gsm8k PATH]"
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);
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std::process::exit(1);
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}
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let target_dir = PathBuf::from(&args[1]);
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let eagle_dir = PathBuf::from(&args[2]);
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let gen_tokens = arg_usize(&args, "--gen-tokens", DEFAULT_GEN_TOKENS);
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let prompt_count = arg_usize(&args, "--prompts", PROMPTS.len()).min(PROMPTS.len());
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let max_seq_len = arg_usize(&args, "--max-seq-len", DEFAULT_MAX_SEQ_LEN);
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let device = arg_usize(&args, "--device", 0) as u32;
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let gamma = arg_usize(&args, "--gamma", 2).max(1);
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let use_tree = args.iter().any(|a| a == "--tree");
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let gsm8k_path = arg_str(&args, "--gsm8k");
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let (prompts_source, default_gen): (Vec<GsmProblem>, usize) = if let Some(p) = &gsm8k_path {
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(load_gsm8k(p), 512)
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} else {
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(
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PROMPTS
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.iter()
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.map(|s| GsmProblem {
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id: String::new(),
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problem: s.to_string(),
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answer: String::new(),
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})
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.collect(),
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DEFAULT_GEN_TOKENS,
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)
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};
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let gen_tokens = arg_usize(&args, "--gen-tokens", default_gen);
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let prompt_count = arg_usize(&args, "--prompts", prompts_source.len()).min(prompts_source.len());
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xserv_cuda::device::set_device(device).unwrap();
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let info = xserv_cuda::device::device_info(device).unwrap();
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@@ -137,8 +154,21 @@ fn main() {
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let mut spec_target_steps = 0usize;
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let mut mismatches = 0usize;
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for (i, prompt) in PROMPTS.iter().take(prompt_count).enumerate() {
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let ids = tokenizer.encode(prompt);
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let is_gsm = gsm8k_path.is_some();
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let mut baseline_correct = 0usize;
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let mut spec_correct = 0usize;
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let mut answer_agree = 0usize;
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let mut both_scored = 0usize;
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let im_end_id = tokenizer.special_token_id("<|im_end|>");
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for (i, item) in prompts_source.iter().take(prompt_count).enumerate() {
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let prompt = &item.problem;
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let ids = if is_gsm {
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let templated = build_chat_prompt(prompt);
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tokenizer.encode(&templated)
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} else {
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tokenizer.encode(prompt)
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};
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if ids.len() + gen_tokens >= max_seq_len {
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eprintln!("prompt {i} too long, skipping");
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continue;
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@@ -195,29 +225,66 @@ fn main() {
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let ok = baseline.ids == spec.ids;
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if !ok {
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mismatches += 1;
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let common = baseline
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.ids
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.iter()
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.zip(spec.ids.iter())
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.position(|(a, b)| a != b)
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.unwrap_or(0);
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eprintln!(
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"MISMATCH prompt {i} (diverge at {}): {prompt}\n baseline: {:?}\n spec: {:?}",
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common, baseline.ids, spec.ids
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);
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if !is_gsm {
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let common = baseline
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.ids
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.iter()
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.zip(spec.ids.iter())
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.position(|(a, b)| a != b)
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.unwrap_or(0);
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eprintln!(
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"MISMATCH prompt {i} (diverge at {}): {prompt}\n baseline: {:?}\n spec: {:?}",
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common, baseline.ids, spec.ids
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);
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}
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}
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println!(
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"prompt={:02} match={} gen={} accept={}/{} target_steps={} baseline_tpot_ms={:.3} spec_tpot_ms={:.3}",
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i,
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ok,
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spec.ids.len(),
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spec.accepted,
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spec.proposed,
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spec.target_steps,
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baseline.total_s * 1000.0 / baseline.ids.len() as f64,
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spec.total_s * 1000.0 / spec.ids.len() as f64,
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);
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if is_gsm {
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let gold = normalize_num(&item.answer);
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let baseline_text = decode_until_im_end(&tokenizer, &baseline.ids, im_end_id);
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let spec_text = decode_until_im_end(&tokenizer, &spec.ids, im_end_id);
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let baseline_pred = extract_answer(&baseline_text);
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let spec_pred = extract_answer(&spec_text);
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let b_ok = gold.is_some() && baseline_pred == gold;
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let s_ok = gold.is_some() && spec_pred == gold;
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let agree = baseline_pred.is_some() && baseline_pred == spec_pred;
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if b_ok {
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baseline_correct += 1;
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}
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if s_ok {
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spec_correct += 1;
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}
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if agree {
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answer_agree += 1;
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}
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both_scored += 1;
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println!(
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"q={:03} id={} tok_match={} gold={} base={} spec={} b_ok={} s_ok={} agree={} base_tpot={:.2} spec_tpot={:.2}",
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i,
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item.id,
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ok,
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gold.as_deref().unwrap_or("?"),
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baseline_pred.as_deref().unwrap_or("?"),
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spec_pred.as_deref().unwrap_or("?"),
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b_ok,
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s_ok,
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agree,
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baseline.total_s * 1000.0 / baseline.ids.len() as f64,
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spec.total_s * 1000.0 / spec.ids.len() as f64,
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);
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} else {
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println!(
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"prompt={:02} match={} gen={} accept={}/{} target_steps={} baseline_tpot_ms={:.3} spec_tpot_ms={:.3}",
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i,
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ok,
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spec.ids.len(),
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spec.accepted,
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spec.proposed,
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spec.target_steps,
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baseline.total_s * 1000.0 / baseline.ids.len() as f64,
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spec.total_s * 1000.0 / spec.ids.len() as f64,
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);
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}
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}
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let baseline_tpot = baseline_total_s * 1000.0 / baseline_tokens as f64;
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@@ -240,6 +307,20 @@ fn main() {
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1000.0 / spec_tpot,
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baseline_tpot / spec_tpot
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);
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if is_gsm && both_scored > 0 {
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println!(
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"gsm8k: baseline_acc={:.4} ({}/{}) spec_acc={:.4} ({}/{}) agreement={:.4} ({}/{})",
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baseline_correct as f64 / both_scored as f64,
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baseline_correct,
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both_scored,
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spec_correct as f64 / both_scored as f64,
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spec_correct,
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both_scored,
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answer_agree as f64 / both_scored as f64,
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answer_agree,
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both_scored,
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);
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}
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}
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#[derive(Default)]
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@@ -924,7 +1005,122 @@ fn arg_usize(args: &[String], flag: &str, default: usize) -> usize {
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.unwrap_or(default)
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}
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fn arg_str(args: &[String], flag: &str) -> Option<String> {
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args.iter()
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.position(|a| a == flag)
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.and_then(|i| args.get(i + 1))
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.cloned()
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}
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fn new_cache(config: &ModelConfig, max_seq_len: usize, device: u32) -> PagedKVCache {
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let num_blocks = (max_seq_len + BLOCK_SIZE - 1) / BLOCK_SIZE + 2;
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PagedKVCache::new(config, num_blocks, 0, 16, num_blocks, DType::BF16, device)
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}
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struct GsmProblem {
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id: String,
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problem: String,
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answer: String,
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}
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fn load_gsm8k(path: &str) -> Vec<GsmProblem> {
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let text = std::fs::read_to_string(path)
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.unwrap_or_else(|e| panic!("failed to read {path}: {e}"));
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let v: serde_json::Value =
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serde_json::from_str(&text).unwrap_or_else(|e| panic!("failed to parse {path}: {e}"));
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let arr = v.as_array().expect("gsm8k json must be a top-level array");
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arr.iter()
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.map(|it| GsmProblem {
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id: it.get("id").and_then(|x| x.as_str()).unwrap_or("").to_string(),
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problem: it
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.get("problem")
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.and_then(|x| x.as_str())
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.unwrap_or("")
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.to_string(),
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answer: it
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.get("answer")
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.and_then(|x| x.as_str())
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.unwrap_or("")
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.to_string(),
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})
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.collect()
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}
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const GSM_SYSTEM: &str = "You are a careful math problem solver. Solve the problem step by step. \
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Put your final numeric answer inside \\boxed{}.";
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fn build_chat_prompt(user: &str) -> String {
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let mut s = String::new();
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s.push_str("<|im_start|>system\n");
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s.push_str(GSM_SYSTEM);
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s.push_str("<|im_end|>\n");
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s.push_str("<|im_start|>user\n");
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s.push_str(user);
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s.push_str("<|im_end|>\n");
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s.push_str("<|im_start|>assistant\n");
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// enable_thinking=false: skip the model's chain-of-thought preamble to
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// save tokens and get straight to the answer.
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s.push_str("<think>\n\n</think>\n\n");
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s
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}
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fn decode_until_im_end(tokenizer: &Tokenizer, ids: &[u32], im_end: Option<u32>) -> String {
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let cut = if let Some(e) = im_end {
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ids.iter().position(|&t| t == e).unwrap_or(ids.len())
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} else {
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ids.len()
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};
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tokenizer.decode(&ids[..cut])
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}
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fn normalize_num(s: &str) -> Option<String> {
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let cleaned: String = s.trim().replace(',', "");
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let f: f64 = cleaned.parse().ok()?;
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if f.fract() == 0.0 && f.abs() < 1e15 {
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Some(format!("{}", f as i64))
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} else {
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Some(format!("{}", f))
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}
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}
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fn extract_answer(text: &str) -> Option<String> {
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// Prefer \boxed{...}
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if let Some(idx) = text.rfind("\\boxed{") {
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let start = idx + "\\boxed{".len();
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let rest = &text[start..];
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if let Some(end) = rest.find('}') {
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let inner = &rest[..end];
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if let Some(n) = last_number_in(inner) {
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return normalize_num(&n);
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}
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}
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}
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// Fallback: last number anywhere in the text.
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last_number_in(text).and_then(|n| normalize_num(&n))
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}
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fn last_number_in(text: &str) -> Option<String> {
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let bytes = text.as_bytes();
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let mut end: Option<usize> = None;
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let mut start: Option<usize> = None;
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let mut i = bytes.len();
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while i > 0 {
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i -= 1;
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let c = bytes[i] as char;
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let is_num = c.is_ascii_digit() || c == '.' || c == ',' || c == '-';
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if end.is_none() {
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if c.is_ascii_digit() {
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end = Some(i + 1);
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start = Some(i);
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}
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} else if is_num {
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start = Some(i);
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} else {
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break;
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}
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}
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match (start, end) {
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(Some(s), Some(e)) => Some(text[s..e].to_string()),
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_ => None,
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}
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}
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