“f32ca6369099f5d3776ae87d431b9b39ea8eba3e”上不存在“paddle/pten/kernels/gpu/expand_grad_kernel.cu”
* add sparse support for sum op * typo fix * fix gpu build error * fix unittest error * typo fix * infer var type and shape in op_test * follow comments * fix build error * bypass some unittests depend on NetOp