always use eigen FFT to compute circular conv/corr, both forward and backward.
always use eigen FFT to compute circular conv/corr, both forward and backward.

shuheik/dynet,clab/dynet,clab/dynet,danielhers/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,chunyang-wen/dynet,chunyang-wen/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,clab/cnn,shuheik/dynet,clab/cnn,clab/dynet,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,shuheik/dynet,clab/dynet,clab/cnn,danielhers/dynet,shuheik/dynet,clab/dynet