All values NaN when training sample 32x32 data about chainer-glow HOT 3 OPEN

loganspear@mpc-research-vm:~/chainer-glow/run$ python3 train.py -dataset /home/loganspear/INCLUDE_ABS_resids_nseg21_nov16_nfft38_npy -b 16 -depth 16 -levels 2 -nn 256 -bits 5 -ext npy -gpu 0
----  ---------------
#     69500
mean     -0.509841
var       0.000216433
----  ---------------
------------------  --------
image_size          (20, 20)
nn_hidden_channels  256
lu_decomposition    False
num_bits_x          5
depth_per_level     16
levels              2
squeeze_factor      2
------------------  --------
loading snapshot/model.hdf5
Iteration 1: Batch 1232 / 4343 - loss: nan - nll: nan - kld: 0.00000000 - log_det: nan
Iteration 1 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.599 min
Iteration 2 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.353 min
Iteration 3 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.157 min
Iteration 4 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.238 min
Iteration 5 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.225 min
Iteration 6 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.382 min
Iteration 7 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.091 min
Iteration 8 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.967 min
Iteration 9 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.133 min
Iteration 10 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.366 min
Iteration 11 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.815 min
Iteration 12 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.650 min
Iteration 13 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.799 min
Iteration 14 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.880 min
Iteration 15 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.924 min
Iteration 16 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.863 min
Iteration 17 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.795 min
Iteration 18 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.813 min
Iteration 19 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.800 min
Iteration 20 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.856 min
Iteration 21 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.741 min
Iteration 22 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.878 min
Iteration 23 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.893 min
Iteration 24 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.791 min
Iteration 25 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.868 min
Iteration 26 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 35.084 min
Iteration 27 - loss: nan - log_likelihood: nan - kld: 0.00000 - elapsed_time: 34.958 min
Iteration 28: Batch 758 / 4343 - loss: nan - nll: nan - kld: 0.00000000 - log_det: nan

python3 train.py -dataset ../../celeba-64x64-images-npy/ -b 4 -depth 32 -levels 4 -nn 512 -bits 5 -ext npy
----  ------------
#     30000
mean     -0.082911
var       0.082476
----  ------------
------------------  --------
depth_per_level     32
levels              4
num_bits_x          5
squeeze_factor      2
nn_hidden_channels  512
image_size          (64, 64)
lu_decomposition    False
------------------  --------
loading snapshot/model.hdf5
Iteration 1: Batch 22 / 7500 - loss: 2.96095991 - nll: 2.20780435 - kld: 0.00000000 - log_det: -0.75315560