import torch
import torchvision
from torch.utils.data import Dataset, DataLoader
import numpy as np
import math
class WineDataset(Dataset):
def __init__(self):
# data load
xy = np.loadtxt('wine.csv', delimiter=',', dtype=np.float32, skiprows=1)
self.x = torch.from_numpy(xy[:, 1:])
self.y = torch.from_numpy(xy[:, [0]]) # n_samples, 1
self.n_samples = xy.shape[0]
def __getitem__(self, index):
return self.x[index], self.y[index]
def __len__(self):
return self.n_samples
dataset = WineDataset()
dataloader = DataLoader(dataset=dataset, batch_size=4, shuffle=True, num_workers=2)
# training loop
num_epochs = 2
total_samples = len(dataset)
n_iterations = math.ceil(total_samples / 4)
print(total_samples, n_iterations)
for epoch in range(num_epochs):
for i, (inputs, labels) in enumerate(dataloader):
# forward backward pass, update weights
if (i + 1) % 5 == 0:
print(f'epoch {epoch + 1}/{num_epochs}, step {i + 1}/{n_iterations}, inputs {inputs.shape}')
Error Message:
C:\Users\samue\AppData\Local\Programs\Python\Python39\python.exe C:/Users/samue/PycharmProjects/dataset/main.py
178 45
178 45
178 45
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 125, in _main
prepare(preparation_data)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 288, in run_path
return _run_module_code(code, init_globals, run_name,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 97, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\samue\PycharmProjects\dataset\main.py", line 34, in <module>
for i, (inputs, labels) in enumerate(dataloader):
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 444, in __iter__
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 125, in _main
prepare(preparation_data)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 288, in run_path
return _run_module_code(code, init_globals, run_name,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 97, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\samue\PycharmProjects\dataset\main.py", line 34, in <module>
for i, (inputs, labels) in enumerate(dataloader):
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 444, in __iter__
return self._get_iterator()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 390, in _get_iterator
return self._get_iterator()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 390, in _get_iterator
return _MultiProcessingDataLoaderIter(self)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1077, in __init__
return _MultiProcessingDataLoaderIter(self)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1077, in __init__
w.start()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
w.start()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
self._popen = self._Popen(self)self._popen = self._Popen(self)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
return Popen(process_obj)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 45, in __init__
return Popen(process_obj)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 45, in __init__
prep_data = spawn.get_preparation_data(process_obj._name)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 154, in get_preparation_data
prep_data = spawn.get_preparation_data(process_obj._name)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 134, in _check_not_importing_main
_check_not_importing_main()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
RuntimeError raise RuntimeError('''
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.
:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.
Traceback (most recent call last):
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1163, in _try_get_data
data = self._data_queue.get(timeout=timeout)
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\multiprocessing\queues.py", line 114, in get
raise Empty
_queue.Empty
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\samue\PycharmProjects\dataset\main.py", line 34, in <module>
for i, (inputs, labels) in enumerate(dataloader):
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 681, in __next__
data = self._next_data()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1359, in _next_data
idx, data = self._get_data()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1325, in _get_data
success, data = self._try_get_data()
File "C:\Users\samue\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\utils\data\dataloader.py", line 1176, in _try_get_data
raise RuntimeError('DataLoader worker (pid(s) {}) exited unexpectedly'.format(pids_str)) from e
RuntimeError: DataLoader worker (pid(s) 3552, 9228) exited unexpectedly
Process finished with exit code 1