[2.2]add API Tensor.T for reverse dim of Tensor

[zhwesky2010]

PR types

New features

PR changes

APIs

Describe

为动态图的Tensor和静态图Variable，添加类成员API：x.T 将N-D Tensor维度翻转 数据重排。

示例代码：

x = paddle.ones(shape=[2, 3, 4])
print(x)
Tensor(shape=[2, 3, 4], dtype=float32, place=CUDAPlace(0), stop_gradient=True,
       [[[1., 1., 1., 1.],
         [1., 1., 1., 1.],
         [1., 1., 1., 1.]],

        [[1., 1., 1., 1.],
         [1., 1., 1., 1.],
         [1., 1., 1., 1.]]])


x_T = x.T
print(x_T)
Tensor(shape=[4, 3, 2], dtype=float32, place=CUDAPlace(0), stop_gradient=True,
       [[[1., 1.],
         [1., 1.],
         [1., 1.]],

        [[1., 1.],
         [1., 1.],
         [1., 1.]],

        [[1., 1.],
         [1., 1.],
         [1., 1.]],

        [[1., 1.],
         [1., 1.],
         [1., 1.]]])

[paddle-bot-old]

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[lanxianghit]

LGTM