Created by: chengduoZH

When the input feature's shape is [n, c, 1, 1], padding is 0, filter_size is 1, stride is 1, according to the following code, Conv_op will fail, but it is not reasonable.

https://github.com/PaddlePaddle/Paddle/blob/d742f4e54b445f6f1d3d68f3ee9f0f8027c32918/paddle/fluid/operators/conv_op.cc#L56-L62