llama.cpp/examples/model-conversion/scripts/utils/perplexity-gen.sh

#!/usr/bin/env bash

set -e

CONVERTED_MODEL="${1:-"$CONVERTED_MODEL"}"
BUILD_DIR="${2:-"$BUILD_DIR"}"

# Final check if we have a model path
if [ -z "$CONVERTED_MODEL" ]; then
    echo "Error: Model path must be provided either as:" >&2
    echo "  1. Command line argument" >&2
    echo "  2. CONVERTED_MODEL environment variable" >&2
    exit 1
fi

# Check if data/wikitext-2-raw directory exists
if [ ! -d "ppl/wikitext-2-raw" ]; then
    echo "ppl/wikitext-2-raw directory does not exist. Downloading..." >&2
    mkdir -p ppl
    pushd ppl
    ./../../../scripts/get-wikitext-2.sh
    popd
fi

mkdir -p ppl
OUTPUTFILE="ppl/$(basename $CONVERTED_MODEL).kld"
echo "Model: $CONVERTED_MODEL"

if [ -z "$BUILD_DIR" ]; then
    BUILD_DIR="../../build"
fi

cmake --build $BUILD_DIR --target llama-perplexity -j8

${BUILD_DIR}/bin/llama-perplexity -m $CONVERTED_MODEL \
    -f ppl/wikitext-2-raw/wiki.test.raw \
    --kl-divergence-base $OUTPUTFILE

echo "Generated logits in $OUTPUTFILE"