将下面的代码从MATLAB转换成python：T=graythresh(CM_2D); change_map=imbinarize(CM_2D,T);

Sure, here's the Python code to convert the given MATLAB code:

import numpy as np
from PIL import Image

# Load CM_2D image
CM_2D = np.array(Image.open('CM_2D.png'))

# Convert to grayscale
CM_2D_gray = np.mean(CM_2D, axis=2)

# Apply Otsu's method to find the threshold value
T = filters.threshold_otsu(CM_2D_gray)

# Threshold the image
change_map = CM_2D_gray > T

Please note that the `imbinarize` function in MATLAB uses Otsu's method to binarize the image, which is equivalent to using the `threshold_otsu` function in Python's `skimage.filters` module.