huffle与permutation的区别 函数shuffle与permutation都是对原来的数组进行重新洗牌(即随机打乱原来的元素顺序):区别在于shuffle直接在原来的数组上进行操作,改变原来数组的顺序,无返回值.而permutation不直接在原来的数组上进行操作,而是返回一个新的打乱顺序的数组,并不改变原来的数组. 示例: a = np.arange(12) print a np.random.shuffle(a) print a print a = np.arange(12) p…
参考API:https://docs.scipy.org/doc/numpy/reference/routines.random.html 1. numpy.random.shuffle() API中关于该函数是这样描述的: Modify a sequence in-place by shuffling its contents. This function only shuffles the array along the first axis of a multi-dimensional…
numpy.random.shuffle(x) Modify a sequence in-place by shuffling its contents. Parameters: x : array_like The array or list to be shuffled. Returns: None Examples >>> >>> arr = np.arange(10) >>> np.random.shuffle(arr) >>>…
1.numpy乘法运算中"*"是数组元素逐个计算 >>> import numpy as np >>> a = np.array([[2,3],[3,4]]) >>> b = np.array([[3,4],[5,6]]) >>> c = a * b >>> c array([[ 6, 12], [15, 24]]) >>> 2.numpy乘法运算中dot是按照矩阵乘法的规则来运…