add map of varaibles for gradients and values to be put in GPU, these variables are just for the current observations, so that the GPU memory won't be exhausted even the lookup parameters are large
add map of varaibles for gradients and values to be put in GPU, these variables are just for the current observations, so that the GPU memory won't be exhausted even the lookup parameters are large

kaishengyao/cnn,kaishengyao/cnn