[XPU] Fix FLAGS_enable_api_kernel_fallback does not take effect in XPU
#76635
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PR Category
User Experience
PR Types
Bug fixes
Description
Pcard-75624
修复
FLAGS_enable_api_kernel_fallback变量在XPU设备上不起效的问题，具体表现为：设置为false或0后，仍然会fallback到CPU上，核心原因在于原先的分支逻辑错误地使用了||，这会导致一旦出现kernel不支持，一定会进入fallback分支。This pull request improves the handling and testing of the
FLAGS_enable_api_kernel_fallbackflag for XPU kernel selection in PaddlePaddle. The main changes include a bug fix to the flag logic in the kernel factory and the addition of a new unit test to verify the flag's behavior.Kernel fallback flag logic:
KernelFactory::SelectKernelOrThrowErrorto ensure that kernel fallback is only attempted whenFLAGS_enable_api_kernel_fallbackis enabled and the kernel is unsupported on XPU. This prevents unintended fallback behavior.Testing:
test/xpu/test_fallback_flag.pythat verifies disablingFLAGS_enable_api_kernel_fallbackraises a runtime error when running an unsupported operation, and restores the flag to its previous state after the test.