Function vec_rescale

include/rabitqlib/utils/space.hpp:124–127

template <typename T>
inline void pack_binary(
    const int* __restrict__ binary_code, T* __restrict__ compact_code, size_t length
) {
    constexpr size_t kTypeBits = sizeof(T) * 8;

    for (size_t i = 0; i < length; i += kTypeBits) {
        T cur = 0;
        for (size_t j = 0; j < kTypeBits; ++j) {