Method prepare_sparse

src/framework/audio/dsp.cpp:580–595

}

SparseMelFilterbank MelFilterbank::prepare_sparse(const AudioTensor & filterbank) const {
    if (filterbank.shape.size() != 2) {
        throw std::runtime_error("SparseMelFilterbank requires rank-2 filterbank");
    }
    const int64_t n_mels = filterbank.shape[0];
    const int64_t freq_bins = filterbank.shape[1];
    if (n_mels <= 0 || freq_bins <= 0 ||
        static_cast<int64_t>(filterbank.values.size()) != checked_product({n_mels, freq_bins})) {
        throw std::runtime_error("SparseMelFilterbank filterbank shape mismatch");
    }
    SparseMelFilterbank sparse;
    sparse.dense = filterbank;
    sparse.starts = sparse_mel_starts(sparse.dense);
    sparse.ends = sparse_mel_ends(sparse.dense);
    return sparse;
}

AudioTensor MelFilterbank::compute(
    const std::vector<float> & power_spec,