y 不能像numpy数组那样对列表进行索引.

y which is an list cannot be indexed like numpy arrays.

示例:

y = [1,2,3,4,6]
idx = np.array([0,1])
print (y[idx])   # This will throw an error as list cannot be index this way
print (np.array(y)[idx]) # This is fine because it is a numpy array now 

解决方案如果 y 是平面列表，则先将其转换为numpy

Solution If y is a flat list then convert it into a numpy first

y = np.array([i[1] for i in dataset])  #label for the data

如果 y 是嵌套列表，则

y = np.array([np.array(i[1]) for i in dataset])  #label for the data