Source code for pytorch_lightning.callbacks.progress.base
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from typing import Any, Dict, Optional, Union
import pytorch_lightning as pl
from pytorch_lightning.callbacks import Callback
from pytorch_lightning.utilities.logger import _version
from pytorch_lightning.utilities.rank_zero import rank_zero_warn
[docs]class ProgressBarBase(Callback):
r"""
The base class for progress bars in Lightning. It is a :class:`~pytorch_lightning.callbacks.Callback`
that keeps track of the batch progress in the :class:`~pytorch_lightning.trainer.trainer.Trainer`.
You should implement your highly custom progress bars with this as the base class.
Example::
class LitProgressBar(ProgressBarBase):
def __init__(self):
super().__init__() # don't forget this :)
self.enable = True
def disable(self):
self.enable = False
def on_train_batch_end(self, trainer, pl_module, outputs, batch_idx):
super().on_train_batch_end(trainer, pl_module, outputs, batch_idx) # don't forget this :)
percent = (self.train_batch_idx / self.total_train_batches) * 100
sys.stdout.flush()
sys.stdout.write(f'{percent:.01f} percent complete \r')
bar = LitProgressBar()
trainer = Trainer(callbacks=[bar])
"""
def __init__(self) -> None:
self._trainer: Optional["pl.Trainer"] = None
self._current_eval_dataloader_idx: Optional[int] = None
@property
def trainer(self) -> "pl.Trainer":
if self._trainer is None:
raise TypeError(f"The `{self.__class__.__name__}._trainer` reference has not been set yet.")
return self._trainer
@property
def sanity_check_description(self) -> str:
return "Sanity Checking"
@property
def train_description(self) -> str:
return "Training"
@property
def validation_description(self) -> str:
return "Validation"
@property
def test_description(self) -> str:
return "Testing"
@property
def predict_description(self) -> str:
return "Predicting"
@property
def train_batch_idx(self) -> int:
"""The number of batches processed during training.
Use this to update your progress bar.
"""
return self.trainer.fit_loop.epoch_loop.batch_progress.current.processed
@property
def val_batch_idx(self) -> int:
"""The number of batches processed during validation.
Use this to update your progress bar.
"""
if self.trainer.state.fn == "fit":
loop = self.trainer.fit_loop.epoch_loop.val_loop
else:
loop = self.trainer.validate_loop
current_batch_idx = loop.epoch_loop.batch_progress.current.processed
return current_batch_idx
@property
def test_batch_idx(self) -> int:
"""The number of batches processed during testing.
Use this to update your progress bar.
"""
return self.trainer.test_loop.epoch_loop.batch_progress.current.processed
@property
def predict_batch_idx(self) -> int:
"""The number of batches processed during prediction.
Use this to update your progress bar.
"""
return self.trainer.predict_loop.epoch_loop.batch_progress.current.processed
@property
def total_train_batches(self) -> Union[int, float]:
"""The total number of training batches, which may change from epoch to epoch.
Use this to set the total number of iterations in the progress bar. Can return ``inf`` if the training
dataloader is of infinite size.
"""
return self.trainer.num_training_batches
@property
def total_val_batches_current_dataloader(self) -> Union[int, float]:
"""The total number of validation batches, which may change from epoch to epoch for current dataloader.
Use this to set the total number of iterations in the progress bar. Can return ``inf`` if the validation
dataloader is of infinite size.
"""
assert self._current_eval_dataloader_idx is not None
if self.trainer.sanity_checking:
return self.trainer.num_sanity_val_batches[self._current_eval_dataloader_idx]
return self.trainer.num_val_batches[self._current_eval_dataloader_idx]
@property
def total_test_batches_current_dataloader(self) -> Union[int, float]:
"""The total number of testing batches, which may change from epoch to epoch for current dataloader.
Use this to set the total number of iterations in the progress bar. Can return ``inf`` if the test dataloader is
of infinite size.
"""
assert self._current_eval_dataloader_idx is not None
return self.trainer.num_test_batches[self._current_eval_dataloader_idx]
@property
def total_predict_batches_current_dataloader(self) -> Union[int, float]:
"""The total number of prediction batches, which may change from epoch to epoch for current dataloader.
Use this to set the total number of iterations in the progress bar. Can return ``inf`` if the predict dataloader
is of infinite size.
"""
assert self._current_eval_dataloader_idx is not None
return self.trainer.num_predict_batches[self._current_eval_dataloader_idx]
@property
def total_val_batches(self) -> Union[int, float]:
"""The total number of validation batches, which may change from epoch to epoch for all val dataloaders.
Use this to set the total number of iterations in the progress bar. Can return ``inf`` if the predict dataloader
is of infinite size.
"""
assert self._trainer is not None
return sum(self.trainer.num_val_batches) if self._trainer.fit_loop.epoch_loop._should_check_val_epoch() else 0
def has_dataloader_changed(self, dataloader_idx: int) -> bool:
old_dataloader_idx = self._current_eval_dataloader_idx
self._current_eval_dataloader_idx = dataloader_idx
return old_dataloader_idx != dataloader_idx
def reset_dataloader_idx_tracker(self) -> None:
self._current_eval_dataloader_idx = None
[docs] def disable(self) -> None:
"""You should provide a way to disable the progress bar."""
raise NotImplementedError
[docs] def enable(self) -> None:
"""You should provide a way to enable the progress bar.
The :class:`~pytorch_lightning.trainer.trainer.Trainer` will call this in e.g. pre-training
routines like the :ref:`learning rate finder <advanced/training_tricks:Learning Rate Finder>`.
to temporarily enable and disable the main progress bar.
"""
raise NotImplementedError
[docs] def print(self, *args: Any, **kwargs: Any) -> None:
"""You should provide a way to print without breaking the progress bar."""
print(*args, **kwargs)
[docs] def setup(self, trainer: "pl.Trainer", pl_module: "pl.LightningModule", stage: Optional[str] = None) -> None:
self._trainer = trainer
if not trainer.is_global_zero:
self.disable()
[docs] def get_metrics(self, trainer: "pl.Trainer", pl_module: "pl.LightningModule") -> Dict[str, Union[int, str]]:
r"""
Combines progress bar metrics collected from the trainer with standard metrics from get_standard_metrics.
Implement this to override the items displayed in the progress bar.
Here is an example of how to override the defaults:
.. code-block:: python
def get_metrics(self, trainer, model):
# don't show the version number
items = super().get_metrics(trainer, model)
items.pop("v_num", None)
return items
Return:
Dictionary with the items to be displayed in the progress bar.
"""
standard_metrics = pl_module.get_progress_bar_dict()
pbar_metrics = trainer.progress_bar_metrics
duplicates = list(standard_metrics.keys() & pbar_metrics.keys())
if duplicates:
rank_zero_warn(
f"The progress bar already tracks a metric with the name(s) '{', '.join(duplicates)}' and"
f" `self.log('{duplicates[0]}', ..., prog_bar=True)` will overwrite this value. "
" If this is undesired, change the name or override `get_metrics()` in the progress bar callback.",
)
return {**standard_metrics, **pbar_metrics}
def get_standard_metrics(trainer: "pl.Trainer", pl_module: "pl.LightningModule") -> Dict[str, Union[int, str]]:
r"""
Returns several standard metrics displayed in the progress bar, including the average loss value,
split index of BPTT (if used) and the version of the experiment when using a logger.
.. code-block::
Epoch 1: 4%|▎ | 40/1095 [00:03<01:37, 10.84it/s, loss=4.501, v_num=10]
Return:
Dictionary with the standard metrics to be displayed in the progress bar.
"""
# call .item() only once but store elements without graphs
running_train_loss = trainer.fit_loop.running_loss.mean()
avg_training_loss = None
if running_train_loss is not None:
avg_training_loss = running_train_loss.cpu().item()
elif pl_module.automatic_optimization:
avg_training_loss = float("NaN")
items_dict: Dict[str, Union[int, str]] = {}
if avg_training_loss is not None:
items_dict["loss"] = f"{avg_training_loss:.3g}"
if pl_module.truncated_bptt_steps > 0:
items_dict["split_idx"] = trainer.fit_loop.split_idx
if trainer.loggers:
version = _version(trainer.loggers)
if version is not None:
if isinstance(version, str):
# show last 4 places of long version strings
version = version[-4:]
items_dict["v_num"] = version
return items_dict
