实际问题中，.mat文件是一个cell.
用scipy库进行读取
import scipy.io as scio
import pandas as pd
import numpy as np
data_path="/Users/wc/Documents/MATLAB/data.mat"
data_train = scio.loadmat(data_path)
data_train_label=data_train.get('label') #取出字典里的label
data_train_data=data_train.get('data')#取出字典里的data