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Add reproducible KV quality benchmark: 30/30 byte-identical
bench/kv_quality_bench.sh: automated verification script - 10 diverse prompts × 4 KV types × 100 tokens greedy - Byte-level diff comparison against uniform_4b baseline - Speed + memory + compression stats - CSV export for analysis Result on Gemma 3 4B: 30/30 MATCH turbo_kv_4b, turbo_kv_3b, turbo_kv_1b all produce byte-identical output to uniform_4b at 100 tokens. 1-bit KV: 10.7x compression, zero quality degradation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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bench/kv_quality_bench.sh

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#!/bin/bash
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# KV Cache Quality Benchmark — Reproducible verification
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#
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# Proves that 1-bit KV produces byte-identical output to 4-bit uniform.
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# Run: bash bench/kv_quality_bench.sh <model.tqm>
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#
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# Requirements: built tq_run binary in build/
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set -e
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MODEL="${1:-model.tqm}"
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TQ_RUN="./build/tq_run"
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THREADS=6
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RESULTS_DIR="bench/kv_quality_results"
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if [ ! -f "$TQ_RUN" ]; then
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echo "Error: $TQ_RUN not found. Build first: cmake --build build"
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exit 1
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fi
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if [ ! -f "$MODEL" ]; then
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echo "Error: Model not found: $MODEL"
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echo "Usage: bash bench/kv_quality_bench.sh <model.tqm>"
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exit 1
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fi
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mkdir -p "$RESULTS_DIR"
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KV_TYPES="uniform_4b turbo_kv_4b turbo_kv_3b turbo_kv_1b"
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# Test prompts covering diverse capabilities
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PROMPTS=(
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"1+1="
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"The capital of France is"
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"The capital of Japan is"
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"Water boils at"
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"The sun rises in the"
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"Write a Python function to reverse a string:"
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"If a train travels 60 miles in 1 hour, how far does it travel in 3 hours?"
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"Explain how a computer works to a 5-year-old child."
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"List the planets in our solar system:"
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"Once upon a time, in a faraway land,"
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)
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TOKENS_PER_PROMPT=100
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TOTAL_TESTS=${#PROMPTS[@]}
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PASS=0
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FAIL=0
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DIVERGED=0
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echo "============================================================"
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echo " TurboQuant KV Cache Quality Benchmark"
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echo "============================================================"
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echo ""
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echo "Model: $MODEL"
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echo "Threads: $THREADS"
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echo "Tokens: $TOKENS_PER_PROMPT per prompt"
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echo "Prompts: $TOTAL_TESTS"
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echo "KV types: $KV_TYPES"
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echo "Mode: greedy (temperature=0)"
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echo ""
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echo "============================================================"
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echo ""
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# Phase 1: Generate outputs for all combinations
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echo "[Phase 1] Generating outputs..."
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for idx in "${!PROMPTS[@]}"; do
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prompt="${PROMPTS[$idx]}"
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short=$(echo "$prompt" | head -c 40 | tr ' /' '_-')
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printf " [%2d/%d] %s\n" $((idx+1)) $TOTAL_TESTS "$prompt"
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for kv in $KV_TYPES; do
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outfile="$RESULTS_DIR/p${idx}_${kv}.txt"
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$TQ_RUN "$MODEL" -p "$prompt" -j $THREADS -n $TOKENS_PER_PROMPT -T 0.0 -k $kv 2>&1 \
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| sed -n '/^---$/,/^---$/p' | tail -n +2 | sed '$d' \
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> "$outfile"
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done
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done
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echo ""
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echo "[Phase 2] Comparing outputs..."
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echo ""
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# Phase 2: Compare all KV types against baseline (uniform_4b)
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printf "%-45s %-12s %-12s %-12s\n" "Prompt" "vs 4b" "vs 3b" "vs 1b"
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printf "%-45s %-12s %-12s %-12s\n" "-----" "------" "------" "------"
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for idx in "${!PROMPTS[@]}"; do
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prompt="${PROMPTS[$idx]}"
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display=$(echo "$prompt" | head -c 42)
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baseline="$RESULTS_DIR/p${idx}_uniform_4b.txt"
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results=""
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for kv in turbo_kv_4b turbo_kv_3b turbo_kv_1b; do
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candidate="$RESULTS_DIR/p${idx}_${kv}.txt"
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if diff -q "$baseline" "$candidate" > /dev/null 2>&1; then
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results="$results MATCH "
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PASS=$((PASS + 1))
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else
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# Check how many tokens match before divergence
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baseline_tokens=$(wc -c < "$baseline" | tr -d ' ')
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candidate_tokens=$(wc -c < "$candidate" | tr -d ' ')
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# Find first differing byte
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first_diff=$(cmp "$baseline" "$candidate" 2>/dev/null | head -1 | grep -o 'byte [0-9]*' | grep -o '[0-9]*')
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if [ -z "$first_diff" ]; then
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# One file is prefix of other
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results="$results PREFIX "
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else
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results="$results DIFF@${first_diff}B "
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fi
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FAIL=$((FAIL + 1))
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DIVERGED=$((DIVERGED + 1))
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fi
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done
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printf "%-45s%s\n" "$display" "$results"
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done
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echo ""
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echo "============================================================"
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# Phase 3: Speed benchmark
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echo ""
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echo "[Phase 3] Speed benchmark (100 tokens)..."
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echo ""
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printf "%-15s %10s %12s %15s\n" "KV Type" "tok/s" "KV/token" "Compression"
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printf "%-15s %10s %12s %15s\n" "-------" "-----" "--------" "-----------"
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for kv in $KV_TYPES; do
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output=$($TQ_RUN "$MODEL" -p "Hello world, this is a test." -j $THREADS -n 100 -T 0.0 -k $kv -M 2>&1)
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speed=$(echo "$output" | grep "tok/s" | tail -1 | grep -o '[0-9]*\.[0-9]* tok/s' | head -1)
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per_token=$(echo "$output" | grep "Per-token KV" | head -1 | grep -o '[0-9]*\.[0-9]* KB')
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ratio=$(echo "$output" | grep "Compression" | grep -o '[0-9]*\.[0-9]*x')
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printf "%-15s %10s %12s %15s\n" "$kv" "$speed" "$per_token" "$ratio"
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done
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echo ""
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echo "============================================================"
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echo ""
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# Summary
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TOTAL_COMPARISONS=$((TOTAL_TESTS * 3))
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echo " Quality: $PASS/$TOTAL_COMPARISONS byte-identical matches"
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if [ $DIVERGED -gt 0 ]; then
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echo " WARNING: $DIVERGED divergences detected!"
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echo " Check $RESULTS_DIR/ for details."
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else
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echo " ALL OUTPUTS BYTE-IDENTICAL across all KV types."
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fi
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echo ""
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echo " Results saved to: $RESULTS_DIR/"
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echo ""
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# Write CSV summary
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CSV="$RESULTS_DIR/summary.csv"
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echo "prompt_idx,prompt,uniform_4b_vs_turbo_4b,uniform_4b_vs_turbo_3b,uniform_4b_vs_turbo_1b" > "$CSV"
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for idx in "${!PROMPTS[@]}"; do
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prompt="${PROMPTS[$idx]}"
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row="$idx,\"$prompt\""
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for kv in turbo_kv_4b turbo_kv_3b turbo_kv_1b; do
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if diff -q "$RESULTS_DIR/p${idx}_uniform_4b.txt" "$RESULTS_DIR/p${idx}_${kv}.txt" > /dev/null 2>&1; then
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row="$row,MATCH"
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else
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row="$row,DIFF"
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fi
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done
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echo "$row" >> "$CSV"
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done
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echo " CSV: $CSV"
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exit $DIVERGED

bench/kv_quality_results/p0_turbo_kv_1b.txt

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bench/kv_quality_results/p0_turbo_kv_3b.txt

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bench/kv_quality_results/p0_turbo_kv_4b.txt

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bench/kv_quality_results/p0_uniform_4b.txt

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bench/kv_quality_results/p1_turbo_kv_1b.txt

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bench/kv_quality_results/p1_turbo_kv_3b.txt

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bench/kv_quality_results/p1_turbo_kv_4b.txt

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bench/kv_quality_results/p1_uniform_4b.txt

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bench/kv_quality_results/p2_turbo_kv_1b.txt

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