“5c66338f4e9678d1a1254c6f1adb5d124a15512c”上不存在“paddle/phi/kernels/merged_momentum_kernel.h”
* Chage `IndicateDataType` to `GetKernelType`. Make it easier to understand. * Change `OpKernelKey` to `OpKernelType` * Make operator developers can customize which kernel the operator will use in runtime.