Pytorch frameworks, a few comparissons


cloc output for catalyst/catalst codebase
class SupervisedRunner(Runner):
"""Runner for experiments with supervised model."""
_experiment_fn: Callable = SupervisedExperimentdef __init__(
model: RunnerModel = None,
device: Device = None,
input_key: Any = "features",
output_key: Any = "logits",
input_target_key: str = "targets",
model (RunnerModel): Torch model object
device (Device): Torch device
input_key (Any): Key in batch dict mapping for model input
output_key (Any): Key in output dict model output
will be stored under
input_target_key (str): Key in batch dict mapping for target
def _init(
input_key: Any = "features",
output_key: Any = "logits",
input_target_key: str = "targets",
input_key (Any): Key in batch dict mapping for model input
output_key (Any): Key in output dict model output
will be stored under
input_target_key (str): Key in batch dict mapping for target
self.experiment: SupervisedExperiment = None
self.input_key = input_key
self.output_key = output_key
self.target_key = input_target_key
if isinstance(self.input_key, str):
# when model expects value
self._process_input = self._process_input_str
elif isinstance(self.input_key, (list, tuple)):
# when model expects tuple
self._process_input = self._process_input_list
elif self.input_key is None:
# when model expects dict
self._process_input = self._process_input_none
raise NotImplementedError()
if isinstance(output_key, str):
# when model returns value
self._process_output = self._process_output_str
elif isinstance(output_key, (list, tuple)):
# when model returns tuple
self._process_output = self._process_output_list
elif self.output_key is None:
# when model returns dict
self._process_output = self._process_output_none
raise NotImplementedError()


cloc output for fastai/fastai codebase
class Learner():
def __init__(self, dls, model, loss_func=None, opt_func=Adam,, splitter=trainable_params, cbs=None,
metrics=None, path=None, model_dir='models', wd=None, wd_bn_bias=False, train_bn=True,
path = Path(path) if path is not None else getattr(dls, 'path', Path('.'))
if loss_func is None:
loss_func = getattr(dls.train_ds, 'loss_func', None)
assert loss_func is not None, "Could not infer loss function from the data, please pass a loss function."
self.dls,self.model = dls,model
store_attr(but='dls,model,cbs'),self.create_mbar,self.logger,self.opt, = False,True,print,None,L()
self.add_cbs([(cb() if isinstance(cb, type) else cb) for cb in L(defaults.callbacks)+L(cbs)])
def metrics(self): return self._metrics
def metrics(self,v): self._metrics = L(v).map(mk_metric)
def _grab_cbs(self, cb_cls): return L(cb for cb in if isinstance(cb, cb_cls))
def add_cbs(self, cbs): L(cbs).map(self.add_cb)
def remove_cbs(self, cbs): L(cbs).map(self.remove_cb)
def add_cb(self, cb):
old = getattr(self,, None)
assert not old or isinstance(old, type(cb)), f"self.{} already registered"
cb.learn = self
setattr(self,, cb)
return self
def remove_cb(self, cb):
if isinstance(cb, type): self.remove_cbs(self._grab_cbs(cb))
cb.learn = None
if hasattr(self, delattr(self,
if cb in
def added_cbs(self, cbs):
try: yield
finally: self.remove_cbs(cbs)
def removed_cbs(self, cbs):
try: yield self
finally: self.add_cbs(cbs)
def ordered_cbs(self, event): return [cb for cb in sort_by_run( if hasattr(cb, event)]def __call__(self, event_name): L(event_name).map(self._call_one)


cloc output for ignite/ignite codebase
def run(self, data: Iterable, max_epochs: Optional[int] = None, epoch_length: Optional[int] = None,) -> State:
"""Runs the `process_function` over the passed data.
Engine has a state and the following logic is applied in this function:- At the first call, new state is defined by `max_epochs`, `epoch_length` if provided. A timer for
total and per-epoch time is initialized when Events.STARTED is handled.
- If state is already defined such that there are iterations to run until `max_epochs` and no input arguments
provided, state is kept and used in the function.
- If state is defined and engine is "done" (no iterations to run until `max_epochs`), a new state is defined.
- If state is defined, engine is NOT "done", then input arguments if provided override defined state.
data (Iterable): Collection of batches allowing repeated iteration (e.g., list or `DataLoader`).
max_epochs (int, optional): Max epochs to run for (default: None).
If a new state should be created (first run or run again from ended engine), it's default value is 1.
If run is resuming from a state, provided `max_epochs` will be taken into account and should be larger
than `engine.state.max_epochs`.
epoch_length (int, optional): Number of iterations to count as one epoch. By default, it can be set as
`len(data)`. If `data` is an iterator and `epoch_length` is not set, then it will be automatically
determined as the iteration on which data iterator raises `StopIteration`.
This argument should not change if run is resuming from a state.
State: output state.
User can dynamically preprocess input batch at :attr:`` and
store output batch in `engine.state.batch`. Latter is passed as usually to `process_function` as argument:
.. code-block:: pythontrainer = ...@trainer.on(Events.ITERATION_STARTED)
def switch_batch(engine):
engine.state.batch = preprocess_batch(engine.state.batch)
Restart the training from the beginning. User can reset `max_epochs = None`:.. code-block:: python# ..., max_epochs=5)
# Reset model weights etc. and restart the training
trainer.state.max_epochs = None, max_epochs=2)
if not isinstance(data, Iterable):
raise TypeError("Argument data should be iterable")
if self.state.max_epochs is not None:
# Check and apply overridden parameters
if max_epochs is not None:
if max_epochs < self.state.epoch:
raise ValueError(
"Argument max_epochs should be larger than the start epoch "
"defined in the state: {} vs {}. Please, set engine.state.max_epochs = None "
"before calling in order to restart the training from the beginning.".format(
max_epochs, self.state.epoch
self.state.max_epochs = max_epochs
if epoch_length is not None:
if epoch_length != self.state.epoch_length:
raise ValueError(
"Argument epoch_length should be same as in the state, given {} vs {}".format(
epoch_length, self.state.epoch_length
if self.state.max_epochs is None or self._is_done(self.state):
# Create new state
if max_epochs is None:
max_epochs = 1
if epoch_length is None:
epoch_length = self._get_data_length(data)
if epoch_length is not None and epoch_length < 1:
raise ValueError("Input data has zero size. Please provide non-empty data")
self.state.iteration = 0
self.state.epoch = 0
self.state.max_epochs = max_epochs
self.state.epoch_length = epoch_length"Engine run starting with max_epochs={}.".format(max_epochs))
"Engine run resuming from iteration {}, epoch {} until {} epochs".format(
self.state.iteration, self.state.epoch, self.state.max_epochs
self.state.dataloader = data
return self._internal_run()


cloc output for pytorch-lightning/plytorch_lightning
def fit(
model: LightningModule,
train_dataloader: Optional[DataLoader] = None,
val_dataloaders: Optional[Union[DataLoader, List[DataLoader]]] = None,
datamodule: Optional[LightningDataModule] = None,
Runs the full optimization routine.
datamodule: A instance of :class:`LightningDataModule`.
model: Model to fit.train_dataloader: A Pytorch DataLoader with training samples. If the model has
a predefined train_dataloader method this will be skipped.
val_dataloaders: Either a single Pytorch Dataloader or a list of them, specifying validation samples.
If the model has a predefined val_dataloaders method this will be skipped
# bookkeeping
self._state = TrainerState.RUNNING
# ----------------------------
# ----------------------------
# setup data, etc...
self.train_loop.setup_fit(model, train_dataloader, val_dataloaders, datamodule)
# hook
# bookkeeping
# we reuse fit in .test() but change its behavior using this flag
self.testing = os.environ.get('PL_TESTING_MODE', self.testing)
# ----------------------------
# ----------------------------
self.accelerator_backend = self.accelerator_connector.select_accelerator()
# ----------------------------
# ----------------------------
# assign training and eval functions... inspect these to see the train and eval loops :)
self.accelerator_backend.train_loop = self.train
self.accelerator_backend.validation_loop = self.run_evaluation
self.accelerator_backend.test_loop = self.run_evaluation
# ----------------------------
# ----------------------------
# hook
results = self.accelerator_backend.train()
# ----------------------------
# POST-Training CLEAN UP
# ----------------------------
# hook
# hook
if self.is_function_implemented('teardown'):
# return 1 when finished
# used for testing or when we need to know that training succeeded
if self._state != TrainerState.INTERRUPTED:
self._state = TrainerState.FINISHED
return results or 1

The winner



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