use plt namespace for imshow in filter_visualization.ipynb
use plt namespace for imshow in filter_visualization.ipynb

gogartom/caffe-textmaps,longjon/caffe,wangg12/caffe,gnina/gnina,longjon/caffe,gogartom/caffe-textmaps,longjon/caffe,wangg12/caffe,tackgeun/caffe,CZCV/s-dilation-caffe,wangg12/caffe,gnina/gnina,gnina/gnina,tackgeun/caffe,CZCV/s-dilation-caffe,gnina/gnina,gnina/gnina,CZCV/s-dilation-caffe,gogartom/caffe-textmaps,longjon/caffe,tackgeun/caffe,tackgeun/caffe,gogartom/caffe-textmaps,wangg12/caffe,CZCV/s-dilation-caffe,gnina/gnina