Fix a bug dependent on glibc version
Fix a bug dependent on glibc version

I changed adam.py so that bugs that depend on the version of glibc do not occur.

hvy/chainer,okuta/chainer,keisuke-umezawa/chainer,ktnyt/chainer,okuta/chainer,chainer/chainer,hvy/chainer,aonotas/chainer,hvy/chainer,jnishi/chainer,niboshi/chainer,ktnyt/chainer,niboshi/chainer,tkerola/chainer,okuta/chainer,wkentaro/chainer,kashif/chainer,pfnet/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,jnishi/chainer,ronekko/chainer,rezoo/chainer,jnishi/chainer,ktnyt/chainer,wkentaro/chainer,chainer/chainer,niboshi/chainer,ktnyt/chainer,chainer/chainer,keisuke-umezawa/chainer,jnishi/chainer,keisuke-umezawa/chainer,anaruse/chainer,niboshi/chainer,wkentaro/chainer,hvy/chainer