* Fix cpplint errors in paddle/fluid/string

* Fix unit test error

* Correct

change mklml download url to bce

Sgd support update selected rows

* Fix cpplint issues

* Fix cpplint issues in channel.h and channel_impl.h

* Fix typo

Enable tensor core for cudnn conv

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into sgd-support-update-selected-rows

Add feed support for ParallelExecutor

add remove_var from c++ end

Fix transpiler condition op in optimize

Fix sendrecv port bind

Fix links error for github images

Fix img links errors

Make MultipleReader thread-safe

Upload fluid image sources to github

Fix Leaf Ops in Graph

Add CUDAPinnedPlace

All leaves must be variables. When all variables are ready, the
execution will be completed. If a operator has no output, the `Op::Run`
might not be started when the execution of graph has been complete.

Fix cpplint errors operators detail

Implementation of MKLDNN FC

Add upsample layer

prepare pserver executor