Numpy元素个数统计、根据条件修改元素值

data数组中小于1的元素都替换为0

data [data < 1.0] = 0

统计元素个数： 

import numpy as np
from collections import Counter
a = np.array([[1,2],[3,4]])
Counter(a.flatten()) # 二维数组需展平统计

Out: Counter({1: 1, 2: 1, 3: 1, 4: 1})