Revert "fix bug"
Revert "fix bug"

This reverts commit 1d4779f75ebf54ab6adb392c3abf0e22ef18314d.

sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet,sxjscience/mxnet