示例1：
        给定：
             data=[[1,2,3,4],[5,6,7,8],]
             axes=[0,1]
             starts=[1,0]
             ends=[2,3]
             strides=[1,1]

        则：
             result=[[5,6,7],]
示例2：
        给定：
             data=[[1,2,3,4],[5,6,7,8],]
             axes=[0,1]
             starts=[1,3]
             ends=[2,0]
             strides=[1,-1]

        则：
             result=[[8,7,6],]
示例3：
        给定：
             data=[[1,2,3,4],[5,6,7,8],]
             axes=[0,1]
             starts=[0,1]
             ends=[-1,1000]    # 此处-1表示第0维的反向第0个位置，索引值是1。
             strides =[1,3]
        则：
             result=[[2],]

import paddle.fluid as fluid
input = fluid.layers.data(
    name="input", shape=[3, 4, 5, 6], dtype='float32', append_batch_size=False)
# example 1:
# attr starts is a list which doesn't contain tensor Variable.
axes = [1, 2, 3]
starts = [-3, 0, 2]
ends = [3, 2, 4]
strides_1 = [1, 1, 1]
strides_2 = [1, 1, 2]
sliced_1 = fluid.layers.strided_slice(input, axes=axes, starts=starts, ends=ends, strides=strides_1)
# sliced_1 is input[:, 0:3:1, 0:2:1, 2:4:1].
# example 2:
# attr starts is a list which contain tensor Variable.
minus_3 = fluid.layers.fill_constant([1], "int32", -3)
sliced_2 = fluid.layers.strided_slice(input, axes=axes, starts=[minus_3, 0, 2], ends=ends, strides=strides_2)
# sliced_2 is input[:, 0:3:1, 0:2:1, 2:4:2].