Created by: NHZlX

https://github.com/PaddlePaddle/models/blob/develop/PaddleCV/image_classification/models/shufflenet_v2.py#L120

Five-dimensional tensor has emerged, which is very unfriendly to the design of inference subgraph.

Suggest:

x = fluid.layers.reshape(
            x=x, shape=[batchsize, groups, channels_per_group, width * height])

x = fluid.layers.transpose(x=x, perm=[0, 2, 1, 3])
x = fluid.layers.reshape(
            x=x, shape=[batchsize, num_channels, height, width])