Created by: jczaja

According to doc: https://www.paddlepaddle.org.cn/documentation/docs/en/1.4/api/layers.html#fc

Multiple input use case is supported " If multiple input tensors are given, the results of multiple output tensors with shape [M, size] will be summed up"

This is not implemented in mkl-dnn fc op. This issue is to track progress on adding this functionality