levers.lua:128: torch.CudaLongTensor does not implement the torch.round() function

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mldl@mldlUB1604:/media/mldl/data1t/ub16_prj/TORCH/CommNet/levers$ th levers.lua --batchsize 512 --lr 10 --clip .01 --hdim 64 --apg 5 --nlevers 5 --reward_only --maxiter 100000 --comm
{
nlevers : 5
nlayer : 2
equal_bags : true
reward_only : true
save : false
savedir : ""
hdim : 64
mdim : 64
comm : true
verbose : 500
recurrent : false
lr : 10
nagents : 500
maxiter : 100000
clip : 0.01
batchsize : 512
apg : 5
slayers_depth : 1
anneal : 1000000
logpath : ""
}
/home/mldl/torch/install/bin/luajit: levers.lua:128: torch.CudaLongTensor does not implement the torch.round() function
stack traceback:
[C]: in function 'round'
levers.lua:128: in main chunk
[C]: in function 'dofile'
...mldl/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: at 0x00405d50
mldl@mldlUB1604:/media/mldl/data1t/ub16_prj/TORCH/CommNet/levers$