[PHI] Migrate elementwise_(add/mul) kernels

[Silv3S]

PR types

Others

PR changes

Others

Describe

• migrate FWD elementwise kernels,
• remove fluid elementwise code.

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[Silv3S]

There is problem with elementwise_add int kernel migrated to PHI, causing test_analyzer_ernie_int8 to drop accuracy and fail. test_analyzer_ernie_int8 has number of iterations set in tester_helper.h. If it's set to 1, same code is executed for both fluid and PHI version of this kernel. Unfortunately, if more iterations are executed, PHI kernel is producing incorrect values because attributes needed for calculations (Scale_x, Scale_y and Scale_out) are lost after first iteration.

That's because ClearDnnAttrs from #48364 is called. But without calling this method, problem is not fixed - last values which were set for each attribute in first iteration are saved and propagated to the end of this test.

Example for Scale_x (Scale_y and Scale_out have same behavior)

Iteration	Scale_X (nr)	Fluid	PHI (with ClearDnnAttrs)	PHI (without ClearDnnAttrs)
1	1	30.6755	30.6755	30.6755
1	2	31.5858	31.5858	31.5858
1	...	...	...	...
1	25	8.46045	8.46045	8.46045
1	26	27.6632	27.6632	27.6632
2	1	30.6755	1.0 (default, no attr found)	27.6632
2	2	31.5858	1.0 (default, no attr found)	27.6632
2	...	...	...	...
2	25	8.46045	1.0 (default, no attr found)	27.6632
2	26	27.6632	1.0 (default, no attr found)	27.6632

Could you please help solve this issue? @YuanRisheng, @chenwhql

[YuanRisheng]

@Silv3S You can try delete Scale_x, Scale_y and Scale_out as shown in the picture. This code is in op_compat.yaml. If that doesn't work, maybe my logic is wrong and I will recur this issue on my machine and debug it. Thank you.

[Silv3S]

@YuanRisheng thank you for reply. Removing these attributes in op_compat.yaml didn't change anything. Scales are still removed after first iteration.

[YuanRisheng]

@YuanRisheng thank you for reply. Removing these attributes in op_compat.yaml didn't change anything. Scales are still removed after first iteration.

I have fixed this problem, you can try again. Thank you

[Silv3S]

@YuanRisheng thank you for solving this issue. I checked tests locally and everything works as expected now

[Silv3S]

@luotao1 could you please approve modifying unity_build_rule.cmake?

[luotao1]

LGTM for unity_build_rule.cmake