Error or Bug when i run config_fwd on my own created Test Set about returnn HOT 1 CLOSED

and this is the error while i turn multiprocessing = true in config_fwd

RETURNN starting up, version 20180405.225130--git-538ed96-dirty, date/time 2018-09-05-10-07-38 (UTC+0200), pid 13293, cwd /home/arman/returnn/demos/mdlstm/IAM, Python /usr/bin/python
RETURNN command line options: ['config_fwd']
faulthandler import error. No module named faulthandler
Theano: 0.9.0 ( in /usr/local/lib/python2.7/dist-packages/Theano-0.9.0-py2.7.egg/theano)
pynvml not available, memory information missing
WARNING (theano.sandbox.cuda): The cuda backend is deprecated and will be removed in the next release (v0.10). Please switch to the gpuarray backend. You can get more information about how to switch at this URL:
https://github.com/Theano/Theano/wiki/Converting-to-the-new-gpu-back-end%28gpuarray%29

Using gpu device 0: GeForce GTX 960M (CNMeM is enabled with initial size: 80.0% of memory, cuDNN 5110)
Device gpuX proc starting up, pid 13327
Device gpuX proc: THEANO_FLAGS = 'compiledir_format=compiledir_%(platform)s-%(processor)s-%(python_version)s-%(python_bitwidth)s--dev-gpuZ,device=gpu,force_device=True'
faulthandler import error. No module named faulthandler
Device train-network: Used data keys: ['classes', 'data', 'sizes']
Device gpu0 proc, pid 13327 is ready for commands.
Devices: Used in multiprocessing mode.
parsing file features/raw/test.h5
loading file 1/1 features/raw/test.h5
cached 3 seqs 0.005933091044425964 GB (fully loaded, 1.6607335759326816 GB left over)
EXCEPTION
Traceback (most recent call last):
File "../../../rnn.py", line 559, in
line: main(sys.argv)
locals:
main = <function main at 0x7feb4fd65410>
sys = <module 'sys' (built-in)>
sys.argv = ['../../../rnn.py', 'config_fwd'], _[0]: {len = 15}
File "../../../rnn.py", line 546, in main
line: init(commandLineOptions=argv[1:])
locals:
init = <function init at 0x7feb4fd651b8>
commandLineOptions =
argv = ['../../../rnn.py', 'config_fwd'], _[0]: {len = 15}
File "../../../rnn.py", line 345, in init
line: initData()
locals:
initData = <function initData at 0x7feb4fd64ed8>
File "../../../rnn.py", line 242, in initData
line: train_data, extra_train = load_data(config, train_cache_bytes, 'train')
locals:
train_data = None
extra_train =
load_data = <function load_data at 0x7feb4fd64e60>
config = <Config.Config instance at 0x7feb4fdd2c68>
train_cache_bytes = 7151908220
File "../../../rnn.py", line 216, in load_data
line: data = init_dataset_via_str(config_str, config=config, cache_byte_size=cache_byte_size, **kwargs)
locals:
data =
init_dataset_via_str = <function init_dataset_via_str at 0x7feb500d6a28>
config_str = 'features/raw/train.1.h5', len = 23
config = <Config.Config instance at 0x7feb4fdd2c68>
cache_byte_size = 7151908220
kwargs = {'name': 'train'}
File "/home/arman/returnn/Dataset.py", line 856, in init_dataset_via_str
line: assert os.path.exists(f)
locals:
os = <module 'os' from '/usr/lib/python2.7/os.pyc'>
os.path = <module 'posixpath' from '/usr/lib/python2.7/posixpath.pyc'>
os.path.exists = <function exists at 0x7feb8af76ed8>
f = 'features/raw/train.1.h5', len = 23
AssertionError
Device gpuX proc, pid 13327: Parent seem to have died: recv_bytes EOFError:

from returnn.