add support for cuda

paddle/fluid/operators/unique_op.cc

@@ -88,8 +88,7 @@ class UniqueOp : public framework::OperatorWithKernel {
   framework::OpKernelType GetExpectedKernelType(
       const framework::ExecutionContext& ctx) const override {
     return framework::OpKernelType(
-        OperatorWithKernel::IndicateVarDataType(ctx, "X"),
-        platform::CPUPlace());
+        OperatorWithKernel::IndicateVarDataType(ctx, "X"), ctx.GetPlace());
   }
 };