import tensorflow as tf a = tf.ones([1, 5, 5, 3]) a.shape a[0][0]
numpy : 索引 a = tf.random.normal([4, 28, 28, 3]) a.shape a[1].shape a[1, 2].shape a[1][2][3].shape a[1, 2, 3, 2].shape
一维切片 a = tf.range(10) a a[-1:] a[-2:] a[:2] a[:-1]
多维切片 a = tf.random.normal([4, 28, 28, 3]) a.shape a[0].shape a[0, :, :, :].shape a[0, 1, :, :].shape a[:, :, :, 0].shape a[:, :, :, 2].shape a[:, 0, :, :].shape
步长::step a = tf.random.normal([4, 28, 28, 3]) a.shape a[0:2, :, :, :].shape a[:, 0:28:2, 0:28:2, :].shape a[:, :14, :14, :].shape a[:, 14:, 14:, :].shape a[:, ::2, ::2, :].shape
倒序::-1 a = tf.range(4) a a[::-1] a[::-2] a[2::-2]
省略号... a = tf.random.normal([2, 4, 28, 28, 3]) a.shape a[0].shape a[0, :, :, :, :].shape a[0, ...].shape a[:, :, :, :, 0].shape a[..., 0].shape a[0, ..., 2].shape a[1, 0, ..., 0].shape
gather a = tf.random.normal([4, 35, 8]) a.shape tf.gather(a, axis=0, indices=[2, 3]).shape a[2:4].shape tf.gather(a, axis=0, indices=[2, 1, 3, 0]).shape tf.gather(a, axis=1, indices=[2, 3, 7, 9, 16]).shape tf.gather(a, axis=2, indices=[2, 3, 7]).shape aa = tf.gather(a,axis,[several students]) aaa = tf.gather(aa,axis,[several subjects])
gather_nd a = tf.random.normal([4, 35, 8]) a.shape tf.gather_nd(a, [0]).shape # [[0],[],[]] tf.gather_nd(a, [0, 1]).shape tf.gather_nd(a, [0, 1, 2]).shape tf.gather_nd(a, [[0, 1, 2]]).shape tf.gather_nd(a, [[0, 0], [1, 1]]).shape tf.gather_nd(a, [[0, 0], [1, 1], [2, 2]]).shape # 第一个班级第一个学生的第一门课 # 第二个班级第二个学生的第二门课 # 第三个班级第三个学生的第三门课 tf.gather_nd(a, [[0, 0, 0], [1, 1, 1], [2, 2, 2]]).shape tf.gather_nd(a, [[[0, 0, 0], [1, 1, 1], [2, 2, 2]]]).shape
boolean_mask a = tf.random.normal([4, 28, 28, 3]) a.shape tf.boolean_mask(a, mask=[True, True, False, False]).shape tf.boolean_mask(a, mask=[True, True, False], axis=3).shape a = tf.ones([2, 3, 4]) a.shape # [2,3],还剩下4,三个True,因此是3*4True tf.boolean_mask(a, mask=[[True, False, False], [False, True, True]]).shape
原文地址:https://www.cnblogs.com/tszr/p/12105009.html
时间: 2024-11-05 22:51:08