message: Re-enable BUILD target for generating the ReluGrad GPU kernel.
  While it already works for valid shapes, it does not check/enforce whether the
  two operands have the same shape. Therefore we cannot replace the Eigen kernel
  yet.
diff: @@ -1097,8 +1097,7 @@ gpu_kernel_library(
  "floor",
  "log",
  "log1p",
  - # TODO(akuegel): Re-enable once relu_grad codegen supports unranked.
  - #"relu_grad",
  + "relu_grad",
  "rsqrt",
  "sqrt",
  "tanh",
  