luobao-intel edited a comment on issue #11664: Fall back when sparse arrays are passed to MKLDNN-enabled operators URL: https://github.com/apache/incubator-mxnet/pull/11664#issuecomment-412388601 The training and testing performance of regression verifying for fallback merge is shown as follows. This data is collected on commit 3ea67a7a16cd20cc982704dd6da284fd79c8c3eb. The training comparison: Topo | batchsize | 6148（fallback）| 6148（origin) - | :-: | -: alexnet |1 |30.594143 |31.317253 |2 |41.044092 |41.132786 |4 |80.769897 |81.800255 |8 |133.454369 |127.187418 |16 |224.20456 |221.552398 |32 |302.540959 |305.953074 |64 |383.023917 |330.386532 |128 |447.751747 |435.501388 |256 |477.884483 |474.643253 vgg-16 | 1 |9.848415 |9.811869 |2 |12.403094 |12.305232 |4 |17.652585 |17.385885 |8 |22.634356 |20.478328 |16 |27.60285 |27.545312 |32 |31.050534 |30.916987 |64 |33.113762 |32.895624 |128 |34.623087 |34.604778 |256 |35.412343 |35.241626 vgg-19 | 1 |8.483369 |8.561665 |2 |10.670349 |10.639146 |4 |15.133063 |15.205443 |8 |19.301709 |19.264988 |16 |22.8069 |23.004417 |32 |25.658372 |25.787008 |64 |27.210528 |27.148756 |128 |28.396534 |28.622843 |256 | 28.990824 |28.944935 inception-bn |1 |5.173929 |5.113685 |2 |9.713608 |9.612722 |4 |18.292555 |17.625253 |8 |32.262617 |32.123224 |16 |51.378436 |50.281799 |32 |71.756796 |77.19132 |64 |99.396415 |101.789003 |128 |122.943234 |125.025602 |256 |140.761579 |140.559997 inception-v3 |1 |3.647243 |3.701843 |2 |6.893006 |7.003765 |4 |12.292691 |12.322165 |8 |20.018688 |20.248172 |16 |29.733195 |29.502392 |32 |39.961187 |39.015816 |64 |46.334718 |47.595459 |128 |53.897898 |54.346451 |256 |58.247023 |58.307715 resnet-50 | 1 |5.828596 |5.758312 |2 |9.999834 |9.925494 |4 |17.197613 |16.971942 |8 |27.336548 |26.727552 |16 |39.047838 |37.635901 |32 |51.535267 |50.304822 |64 |60.800547 |59.694137 |128 | 68.016266 |66.886088 |256 |73.783432 |72.118631 resnet-152 |1 |2.073641 |2.020319 |2 |3.745274 |3.577454 |4 |6.488948 |6.380499 |8 |10.482311 |10.37387 |16 |15.354603 |14.47856 |32 |19.90136 |19.666869 |64 |25.205104 |24.286143 |128 |28.272118 |28.342906 |256 |30.751341 |29.938136
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