Oh you are right, thanks. Now it works but it gives me another error 
File “”, line 1, in 
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\spawn.py”, line 105, in spawn_main
exitcode = _main(fd)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\spawn.py”, line 114, in _main
prepare(preparation_data)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\spawn.py”, line 225, in prepare
_fixup_main_from_path(data[‘init_main_from_path’])
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\spawn.py”, line 277, in _fixup_main_from_path
run_name=“mp_main”)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\runpy.py”, line 263, in run_path
pkg_name=pkg_name, script_name=fname)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\runpy.py”, line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\runpy.py”, line 85, in run_code
exec(code, run_globals)
File “C:\Users\bened\Desktop\UNIVERSITA’\dottorato_ricerca_Nijmegen\breast-unet\lib\common\data\MCs_mammo\data_loader4.py”, line 15, in 
from torch.utils.data import Dataset
File "C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch_init.py", line 257, in 
from .functional import *
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\functional.py”, line 2, in 
Traceback (most recent call last):
File “C:/Users/bened/Desktop/UNIVERSITA’/dottorato_ricerca_Nijmegen/breast-unet/lib/common/data/MCs_mammo/data_loader4.py”, line 509, in 
train()
File “C:/Users/bened/Desktop/UNIVERSITA’/dottorato_ricerca_Nijmegen/breast-unet/lib/common/data/MCs_mammo/data_loader4.py”, line 502, in train
for i, data in enumerate(train_loader, 0):
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\utils\data\dataloader.py”, line 501, in iter
return _DataLoaderIter(self)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\utils\data\dataloader.py”, line 289, in init
w.start()
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\process.py”, line 105, in start
self._popen = self._Popen(self)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\context.py”, line 223, in _Popen
return _default_context.get_context().Process.Popen(process_obj)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\context.py”, line 322, in Popen
return Popen(process_obj)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\popen_spawn_win32.py”, line 65, in init
reduction.dump(process_obj, to_child)
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\multiprocessing\reduction.py”, line 60, in dump
ForkingPickler(file, protocol).dump(obj)
BrokenPipeError: [Errno 32] Broken pipe
import torch.nn.functional as F
File "C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\nn_init.py", line 1, in 
from .modules import *
File "C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\nn\modules_init.py", line 1, in 
from .module import Module
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\nn\modules\module.py”, line 6, in 
from …backends.thnn import backend as thnn_backend
File “C:\Users\bened\Miniconda3\envs\breast-manet-master2\lib\site-packages\torch\nn\backends\thnn.py”, line 41, in 
_initialize_backend()
, line 23, in _initialize_backend
from …_functions.rnn import RNN, 
", line 4, in 
from … import functional as F
File “”, line 971, in _find_and_load
File “”, line 955, in _find_and_load_unlocked
File “”, line 665, in _load_unlocked
File “”, line 674, in exec_module
File “”, line 771, in get_code
File “”, line 482, in _validate_bytecode_header
MemoryError