Add support for keras upsampling (#305)
Add support for keras upsampling (#305)

* Add support for keras upsampling

* Fix code formatting

* Fix indentation

* Fix indentation round 2

* Hide unused parameter

* Only enable UpSampling2D since the others are not currently supported by TVM

* Improve error messages and code layout

Huyuwei/tvm,sxjscience/tvm,Laurawly/tvm-1,dmlc/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,dmlc/tvm,sxjscience/tvm,Laurawly/tvm-1,dmlc/tvm,tqchen/tvm,sxjscience/tvm,Laurawly/tvm-1,Huyuwei/tvm,Huyuwei/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,dmlc/tvm,sxjscience/tvm,Huyuwei/tvm,Laurawly/tvm-1,tqchen/tvm,tqchen/tvm,sxjscience/tvm,tqchen/tvm,Huyuwei/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,Huyuwei/tvm,sxjscience/tvm,dmlc/tvm,dmlc/tvm,sxjscience/tvm,dmlc/tvm,sxjscience/tvm,Huyuwei/tvm,tqchen/tvm,tqchen/tvm,Laurawly/tvm-1,dmlc/tvm,sxjscience/tvm,tqchen/tvm,Huyuwei/tvm,Laurawly/tvm-1