code: public static PairedStats fromByteArray(byte[] byteArray) {
      checkNotNull(byteArray);
      checkArgument(
          byteArray.length == BYTES,
          "Expected PairedStats.BYTES = %s, got %s",
          BYTES,
          byteArray.length);
      ByteBuffer buffer = ByteBuffer.wrap(byteArray).order(ByteOrder.LITTLE_ENDIAN);
      Stats xStats = Stats.readFrom(buffer);
      Stats yStats = Stats.readFrom(buffer);
      double sumOfProductsOfDeltas = buffer.getDouble();
      return new PairedStats(xStats, yStats, sumOfProductsOfDeltas);
    }
docs: Creates a {@link PairedStats} instance from the given byte representation which was obtained by
  {@link #toByteArray}.
  
  <p><b>Note:</b> No guarantees are made regarding stability of the representation between
  versions.