serialized_nbytes MatrixMultiplicationKey.serialized_nbytes Shows the size of a matrix multiplication key when serialized. Output serialized_nbytes, int from desilofhe import Engine engine = Engine(slot_count=64) secret_key = engine.create_secret_key() matrix_multiplication_key = engine.create_matrix_multiplication_key(secret_key) serialized_nbytes = matrix_multiplication_key.serialized_nbytes