Created by: zhiqiu

PR types

Bug fixes

PR changes

Others

Describe

Fix bug of handling blank characters in operators.cmake

Paddle automatically add USE_OP(or USE_OP_DEVICE_KERNEL) for each operator target to pybind.h during running cmake (to avoid the operator registrar being removed from the generated binary file by the linker).

The approach is to extract REGISTER_OPERAOR( using regex for the source file of each operator, like xx_op.cc, and find the first registered operator.

However, the original implementation did not handle blank characters, which may result in errors, link https://github.com/PaddlePaddle/Paddle/pull/27112#issuecomment-691941000.

The problem is, due to code formatting, the REGISTER_OPERATOR(xxx may be separated into two lines. For example, elementwise_add_grad and elementwise_add_grad_grad in elementwise_add_op.cc.

REGISTER_OPERATOR(
    elementwise_add_grad, ops::ElementwiseOpGrad,
    ops::ElementwiseGradOpInplaceInferer, ops::ElementwiseGradNoBufVarsInferer,
    ops::ElementwiseAddDoubleGradMaker<paddle::framework::OpDesc>,
    ops::ElementwiseAddDoubleGradMaker<paddle::imperative::OpBase>);

REGISTER_OPERATOR(elementwise_add_grad_grad,
                  ops::ElementwiseOpDoubleGradWithoutDXDY,
                  ops::ElementwiseDoubleGradOpInplaceInferer,
                  ops::ElementwiseDoubleGradNoBufVarsInferer);

Since the REGISTER_OPERATOR(elementwise_add_grad, ...) is separated into two lines, the regex will match elementwise_add_grad_grad. And, since elementwise_add_mkldnn_op.cc is present, a line USE_OP_DEVICE_KERNEL(elementwise_add_grad_grad, MKLDNN) will be added to pybind.h, which results in https://github.com/PaddlePaddle/Paddle/pull/27112#issuecomment-691941000.

This PR fixes that.