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[英]pytorch recover from RuntimeError: CUDA error: device-side assert triggered without restarting script
[英]pytorch RuntimeError: CUDA error: device-side assert triggered
我在 google colab 上有一個筆記本失敗並出現以下錯誤
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in fit(epochs, model, loss_func, opt, data, callbacks, metrics)
93 exception = e
---> 94 raise e
95 finally: cb_handler.on_train_end(exception)
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in fit(epochs, model, loss_func, opt, data, callbacks, metrics)
83 xb, yb = cb_handler.on_batch_begin(xb, yb)
---> 84 loss = loss_batch(model, xb, yb, loss_func, opt, cb_handler)
85 if cb_handler.on_batch_end(loss): break
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in loss_batch(model, xb, yb, loss_func, opt, cb_handler)
24 if opt is not None:
---> 25 loss = cb_handler.on_backward_begin(loss)
26 loss.backward()
/usr/local/lib/python3.6/dist-packages/fastai/callback.py in on_backward_begin(self, loss)
223 for cb in self.callbacks:
--> 224 a = cb.on_backward_begin(**self.state_dict)
225 if a is not None: self.state_dict['last_loss'] = a
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in on_backward_begin(self, smooth_loss, **kwargs)
266 if self.pbar is not None and hasattr(self.pbar,'child'):
--> 267 self.pbar.child.comment = f'{smooth_loss:.4f}'
268
/usr/local/lib/python3.6/dist-packages/torch/tensor.py in __format__(self, format_spec)
377 if self.dim() == 0:
--> 378 return self.item().__format__(format_spec)
379 return object.__format__(self, format_spec)
RuntimeError: CUDA error: device-side assert triggered
During handling of the above exception, another exception occurred:
RuntimeError Traceback (most recent call last)
<ipython-input-33-dd390b1c8108> in <module>()
----> 1 lr_find(learn)
2 learn.recorder.plot()
/usr/local/lib/python3.6/dist-packages/fastai/train.py in lr_find(learn, start_lr, end_lr, num_it, stop_div, **kwargs)
26 cb = LRFinder(learn, start_lr, end_lr, num_it, stop_div)
27 a = int(np.ceil(num_it/len(learn.data.train_dl)))
---> 28 learn.fit(a, start_lr, callbacks=[cb], **kwargs)
29
30 def to_fp16(learn:Learner, loss_scale:float=512., flat_master:bool=False)->Learner:
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in fit(self, epochs, lr, wd, callbacks)
160 callbacks = [cb(self) for cb in self.callback_fns] + listify(callbacks)
161 fit(epochs, self.model, self.loss_func, opt=self.opt, data=self.data, metrics=self.metrics,
--> 162 callbacks=self.callbacks+callbacks)
163
164 def create_opt(self, lr:Floats, wd:Floats=0.)->None:
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in fit(epochs, model, loss_func, opt, data, callbacks, metrics)
93 exception = e
94 raise e
---> 95 finally: cb_handler.on_train_end(exception)
96
97 loss_func_name2activ = {'cross_entropy_loss': partial(F.softmax, dim=1), 'nll_loss': torch.exp, 'poisson_nll_loss': torch.exp,
/usr/local/lib/python3.6/dist-packages/fastai/callback.py in on_train_end(self, exception)
254 def on_train_end(self, exception:Union[bool,Exception])->None:
255 "Handle end of training, `exception` is an `Exception` or False if no exceptions during training."
--> 256 self('train_end', exception=exception)
257
258 class AverageMetric(Callback):
/usr/local/lib/python3.6/dist-packages/fastai/callback.py in __call__(self, cb_name, call_mets, **kwargs)
185 "Call through to all of the `CallbakHandler` functions."
186 if call_mets: [getattr(met, f'on_{cb_name}')(**self.state_dict, **kwargs) for met in self.metrics]
--> 187 return [getattr(cb, f'on_{cb_name}')(**self.state_dict, **kwargs) for cb in self.callbacks]
188
189 def on_train_begin(self, epochs:int, pbar:PBar, metrics:MetricFuncList)->None:
/usr/local/lib/python3.6/dist-packages/fastai/callback.py in <listcomp>(.0)
185 "Call through to all of the `CallbakHandler` functions."
186 if call_mets: [getattr(met, f'on_{cb_name}')(**self.state_dict, **kwargs) for met in self.metrics]
--> 187 return [getattr(cb, f'on_{cb_name}')(**self.state_dict, **kwargs) for cb in self.callbacks]
188
189 def on_train_begin(self, epochs:int, pbar:PBar, metrics:MetricFuncList)->None:
/usr/local/lib/python3.6/dist-packages/fastai/callbacks/lr_finder.py in on_train_end(self, **kwargs)
45 # restore the valid_dl we turned of on `__init__`
46 self.data.valid_dl = self.valid_dl
---> 47 self.learn.load('tmp')
48 if hasattr(self.learn.model, 'reset'): self.learn.model.reset()
49 print('LR Finder complete, type {learner_name}.recorder.plot() to see the graph.')
/usr/local/lib/python3.6/dist-packages/fastai/basic_train.py in load(self, name, device)
202 "Load model `name` from `self.model_dir` using `device`, defaulting to `self.data.device`."
203 if device is None: device = self.data.device
--> 204 self.model.load_state_dict(torch.load(self.path/self.model_dir/f'{name}.pth', map_location=device))
205 return self
206
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in load(f, map_location, pickle_module)
356 f = open(f, 'rb')
357 try:
--> 358 return _load(f, map_location, pickle_module)
359 finally:
360 if new_fd:
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in _load(f, map_location, pickle_module)
527 unpickler = pickle_module.Unpickler(f)
528 unpickler.persistent_load = persistent_load
--> 529 result = unpickler.load()
530
531 deserialized_storage_keys = pickle_module.load(f)
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in persistent_load(saved_id)
493 if root_key not in deserialized_objects:
494 deserialized_objects[root_key] = restore_location(
--> 495 data_type(size), location)
496 storage = deserialized_objects[root_key]
497 if view_metadata is not None:
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in restore_location(storage, location)
376 elif isinstance(map_location, torch.device):
377 def restore_location(storage, location):
--> 378 return default_restore_location(storage, str(map_location))
379 else:
380 def restore_location(storage, location):
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in default_restore_location(storage, location)
102 def default_restore_location(storage, location):
103 for _, _, fn in _package_registry:
--> 104 result = fn(storage, location)
105 if result is not None:
106 return result
/usr/local/lib/python3.6/dist-packages/torch/serialization.py in _cuda_deserialize(obj, location)
84 'to an existing device.'.format(
85 device, torch.cuda.device_count()))
---> 86 return obj.cuda(device)
87
88
/usr/local/lib/python3.6/dist-packages/torch/_utils.py in _cuda(self, device, non_blocking, **kwargs)
74 else:
75 new_type = getattr(torch.cuda, self.__class__.__name__)
---> 76 return new_type(self.size()).copy_(self, non_blocking)
77
78
RuntimeError: cuda runtime error (59) : device-side assert triggered at /pytorch/aten/src/THC/generic/THCTensorCopy.cpp:20
沒有關於真正原因的信息,我試圖通過使用這樣的單元強制 cuda 在一個 gpu 上運行(如建議here )來獲取堆棧跟蹤
!export CUDA_LAUNCH_BLOCKING=1
但這似乎不起作用,仍然有相同的錯誤。
是否有另一種適用於 Google Colab 的方法?
確保您的目標值從 0 開始到類數 - 1。例如:您有 100 個分類類,因此您的目標應該是從 0 到 99
!export FOO=blah
在筆記本中運行通常沒有用,因為!
表示在子shell 中運行以下命令,因此語句的效果在!
返回。 通過將 Python 代碼存儲在文件中,然后在子 shell 中執行該文件,您可能會取得更大的成功:
在一個單元格中:
%%writefile foo.py
[...your code...]
在下一個單元格中:
!export CUDA_LAUNCH_BLOCKING=1; python3 foo.py
(或 s/python3/python2/ 如果您正在編寫 py2)
在Runtime->Change Runtime Type
下將 Hardware Accelerator Type 切換為“None”。 這應該會給你一個更有意義的錯誤信息。
在 Google Colab 中設置環境變量的正確方法是使用os
:
import os
os.environ['CUDA_LAUNCH_BLOCKING'] = "1"
使用os
庫將允許您設置您需要的任何環境變量。 CUDA_LAUNCH_BLOCKING
這種方式設置CUDA_LAUNCH_BLOCKING
可以在 Google Colab 中啟用正確的 CUDA 回溯。
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