import cv2
import numpy as np

# Create some data
data = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

# Write to XML
fs = cv2.FileStorage("data.yaml", cv2.FILE_STORAGE_WRITE)
fs.write("data", data)
fs.release()

# Read from XML
fs = cv2.FileStorage("data.yaml", cv2.FILE_STORAGE_READ)
data_read = fs.getNode("data").mat()
print(data_read)