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Adding lrn op for ngraph engine !17189

!17189 已合并 由 saxon_zh@saxon_zh 创建

Created by: baojun-nervana

Added lrn op for ngraph engine which is needed for googlenet. A CreateConst helper function was added as well. In the unittest, the tolerance was relaxed to 0.002, same as mkldnn test case. Otherwise I see the error as the following (don't quite understand the random decimal digits).

AssertionError: Output (MidOut) has diff at CPUPlace 514: Expect [[[[2.0005884 2.0006845 2.0005584 2.0006466 2.000742 ] 514: [2.0004916 2.0007987 2.0007715 2.0007942 2.0006254] 514: [2.0006313 2.0007539 2.0008295 2.0007706 2.0007606] 514: [2.000683 2.0005753 2.0004666 2.0005774 2.0008302] 514: [2.0005436 2.0009174 2.0009565 2.0007875 2.00066 ]] 514: 514: [[2.0005884 2.0006845 2.0005584 2.0006466 2.000742 ] 514: [2.0004916 2.0007987 2.0007715 2.0007942 2.0006254] 514: [2.0006313 2.0007539 2.0008295 2.0007706 2.0007606] 514: [2.000683 2.0005753 2.0004666 2.0005774 2.0008302] 514: [2.0005436 2.0009174 2.0009565 2.0007875 2.00066 ]] 514: 514: [[2.0005884 2.0006845 2.0005584 2.0006466 2.000742 ] 514: [2.0004916 2.0007987 2.0007715 2.0007942 2.0006254] 514: [2.0006313 2.0007539 2.0008295 2.0007706 2.0007606] 514: [2.000683 2.0005753 2.0004666 2.0005774 2.0008302] 514: [2.0005436 2.0009174 2.0009565 2.0007875 2.00066 ]]] 514: 514: 514: [[[2.0008764 2.0006783 2.0005012 2.0005872 2.0006566] 514: [2.0007496 2.000762 2.000739 2.0008848 2.0009556] 514: [2.0006292 2.0005717 2.0003912 2.0007153 2.0006144] 514: [2.0006511 2.0008154 2.0007868 2.0006576 2.0008616] 514: [2.0009568 2.000582 2.0004728 2.000677 2.0008805]] 514: 514: [[2.0008764 2.0006783 2.0005012 2.0005872 2.0006566] 514: [2.0007496 2.000762 2.000739 2.0008848 2.0009556] 514: [2.0006292 2.0005717 2.0003912 2.0007153 2.0006144] 514: [2.0006511 2.0008154 2.0007868 2.0006576 2.0008616] 514: [2.0009568 2.000582 2.0004728 2.000677 2.0008805]] 514: 514: [[2.0008764 2.0006783 2.0005012 2.0005872 2.0006566] 514: [2.0007496 2.000762 2.000739 2.0008848 2.0009556] 514: [2.0006292 2.0005717 2.0003912 2.0007153 2.0006144] 514: [2.0006511 2.0008154 2.0007868 2.0006576 2.0008616] 514: [2.0009568 2.000582 2.0004728 2.000677 2.0008805]]]] 514: But Got[[[[2. 2. 2. 2. 2.] 514: [2. 2. 2. 2. 2.]