Support empty input tensor for some ops (fix #14657) (#15264)
* Support empty input tensor for FusedBatchNorm,FusedBatchNormGrad,Conv2DBackpropFilter (fix #14657) * Also fix pooling ops * Add some comments in ops * Add tests for conv/pooling/bn. * Return NaN mean/variance when input is empty * update comments * fix typo * Move fill_functor implementations to :fill_functor
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