Update README.md

tensorflow2fluid/README.md

@@ -198,6 +198,7 @@ Model|Pre-trained Model|Average Diff|Max Diff
 [vgg_19](https://github.com/tensorflow/models/blob/master/research/slim/nets/vgg.py)|[vgg_19_2016_08_28.tar.gz](http://download.tensorflow.org/models/vgg_19_2016_08_28.tar.gz)|1.7e-07|1.7e-06
 [resnet_v1_50](https://github.com/tensorflow/models/blob/master/research/slim/nets/resnet_v1.py)|[resnet_v1_50_2016_08_28.tar.gz](http://download.tensorflow.org/models/resnet_v1_50_2016_08_28.tar.gz)|2.0e-09|1.1e-06
 [resnet_v1_101](https://github.com/tensorflow/models/blob/master/research/slim/nets/resnet_v1.py)|[resnet_v1_101_2016_08_28.tar.gz](http://download.tensorflow.org/models/resnet_v1_101_2016_08_28.tar.gz)|1.8e-09|4.7e-07
+[alexnet_v2](https://github.com/tensorflow/models/blob/master/research/slim/nets/alexnet.py)|-|1.7e-07|1.0e-06|
 [inception_v3](https://github.com/tensorflow/models/blob/master/research/slim/nets/inception_v3.py)|[inception_v3_2016_08_28.tar.gz](http://download.tensorflow.org/models/inception_v3_2016_08_28.tar.gz)|-|-
 
 ## Link