def nc_scenario(train_dataset: Union[Sequence[SupportedDataset],
SupportedDataset],
test_dataset: Union[Sequence[SupportedDataset],
SupportedDataset],
n_experiences: int,
task_labels: bool,
*,
shuffle: bool = True,
seed: Optional[int] = None,
fixed_class_order: Sequence[int] = None,
per_exp_classes: Dict[int, int] = None,
class_ids_from_zero_from_first_exp: bool = False,
class_ids_from_zero_in_each_exp: bool = False,
one_dataset_per_exp: bool = False,
reproducibility_data: Dict[str, Any] = None) -> NCScenario:
"""
This helper function is DEPRECATED in favor of `nc_benchmark`.
This method is the high-level specific scenario generator for the
"New Classes" (NC) case. Given a sequence of train and test datasets creates
the continual stream of data as a series of experiences. Each experience
will contain all the patterns belonging to a certain set of classes and a
class won't be assigned to more than one experience.
The ``task_labels`` parameter determines if each incremental experience has
an increasing task label or if, at the contrary, a default task label "0"
has to be assigned to all experiences. This can be useful when
differentiating between Single-Incremental-Task and Multi-Task scenarios.
There are other important parameters that can be specified in order to tweak
the behaviour of the resulting scenario. Please take a few minutes to read
and understand them as they may save you a lot of work.
This generator features a integrated reproducibility mechanism that allows
the user to store and later re-load a scenario. For more info see the
``reproducibility_data`` parameter.
:param train_dataset: A list of training datasets, or a single dataset.
:param test_dataset: A list of test datasets, or a single test dataset.
:param n_experiences: The number of incremental experience. This is not used
when using multiple train/test datasets with the ``one_dataset_per_exp``
parameter set to True.
:param task_labels: If True, each experience will have an ascending task
label. If False, the task label will be 0 for all the experiences.
:param shuffle: If True, the class (or experience) order will be shuffled.
Defaults to True.
:param seed: If ``shuffle`` is True and seed is not None, the class (or
experience) order will be shuffled according to the seed. When None, the
current PyTorch random number generator state will be used. Defaults to
None.
:param fixed_class_order: If not None, the class order to use (overrides
the shuffle argument). Very useful for enhancing reproducibility.
Defaults to None.
:param per_exp_classes: Is not None, a dictionary whose keys are
(0-indexed) experience IDs and their values are the number of classes
to include in the respective experiences. The dictionary doesn't
have to contain a key for each experience! All the remaining experiences
will contain an equal amount of the remaining classes. The
remaining number of classes must be divisible without remainder
by the remaining number of experiences. For instance,
if you want to include 50 classes in the first experience
while equally distributing remaining classes across remaining
experiences, just pass the "{0: 50}" dictionary as the
per_experience_classes parameter. Defaults to None.
:param class_ids_from_zero_from_first_exp: If True, original class IDs
will be remapped so that they will appear as having an ascending
order. For instance, if the resulting class order after shuffling
(or defined by fixed_class_order) is [23, 34, 11, 7, 6, ...] and
class_ids_from_zero_from_first_exp is True, then all the patterns
belonging to class 23 will appear as belonging to class "0",
class "34" will be mapped to "1", class "11" to "2" and so on.
This is very useful when drawing confusion matrices and when dealing
with algorithms with dynamic head expansion. Defaults to False.
Mutually exclusive with the ``class_ids_from_zero_in_each_exp``
parameter.
:param class_ids_from_zero_in_each_exp: If True, original class IDs
will be mapped to range [0, n_classes_in_exp) for each experience.
Defaults to False. Mutually exclusive with the
``class_ids_from_zero_from_first_exp`` parameter.
:param one_dataset_per_exp: available only when multiple train-test
datasets are provided. If True, each dataset will be treated as a
experience. Mutually exclusive with the ``per_experience_classes`` and
``fixed_class_order`` parameters. Overrides the ``n_experiences``
parameter. Defaults to False.
:param reproducibility_data: If not None, overrides all the other
scenario definition options. This is usually a dictionary containing
data used to reproduce a specific experiment. One can use the
``get_reproducibility_data`` method to get (and even distribute)
the experiment setup so that it can be loaded by passing it as this
parameter. In this way one can be sure that the same specific
experimental setup is being used (for reproducibility purposes).
Beware that, in order to reproduce an experiment, the same train and
test datasets must be used. Defaults to None.
:return: A properly initialized :class:`NCScenario` instance.
"""
warnings.warn('nc_scenario is deprecated in favor of nc_benchmark.')
if class_ids_from_zero_from_first_exp and class_ids_from_zero_in_each_exp:
raise ValueError('Invalid mutually exclusive options '
'class_ids_from_zero_from_first_exp and '
'classes_ids_from_zero_in_each_exp set at the '
'same time')
if isinstance(train_dataset, list) or isinstance(train_dataset, tuple):
# Multi-dataset setting
if len(train_dataset) != len(test_dataset):
raise ValueError('Train/test dataset lists must contain the '
'exact same number of datasets')
if per_exp_classes and one_dataset_per_exp:
raise ValueError(
'Both per_experience_classes and one_dataset_per_exp are'
'used, but those options are mutually exclusive')
if fixed_class_order and one_dataset_per_exp:
raise ValueError(
'Both fixed_class_order and one_dataset_per_exp are'
'used, but those options are mutually exclusive')
seq_train_dataset, seq_test_dataset, mapping = \
concat_datasets_sequentially(train_dataset, test_dataset)
if one_dataset_per_exp:
# If one_dataset_per_exp is True, each dataset will be treated as
# a experience. In this scenario, shuffle refers to the experience
# order, not to the class one.
fixed_class_order, per_exp_classes = \
_one_dataset_per_exp_class_order(mapping, shuffle, seed)
# We pass a fixed_class_order to the NCGenericScenario
# constructor, so we don't need shuffling.
shuffle = False
seed = None
# Overrides n_experiences (and per_experience_classes, already done)
n_experiences = len(train_dataset)
train_dataset, test_dataset = seq_train_dataset, seq_test_dataset
# Datasets should be instances of AvalancheDataset
train_dataset = as_classification_dataset(train_dataset).train()
test_dataset = as_classification_dataset(test_dataset).eval()
return NCScenario(train_dataset, test_dataset, n_experiences, task_labels,
shuffle, seed, fixed_class_order, per_exp_classes,
class_ids_from_zero_from_first_exp,
class_ids_from_zero_in_each_exp, reproducibility_data)
def ni_scenario(
train_dataset: Union[
Sequence[SupportedDataset], SupportedDataset],
test_dataset: Union[
Sequence[SupportedDataset], SupportedDataset],
n_experiences: int,
*,
task_labels: bool = False,
shuffle: bool = True,
seed: Optional[int] = None,
balance_experiences: bool = False,
min_class_patterns_in_exp: int = 0,
fixed_exp_assignment: Optional[Sequence[Sequence[int]]] = None,
reproducibility_data: Optional[Dict[str, Any]] = None) \
-> NIScenario:
"""
This helper function is DEPRECATED in favor of `ni_benchmark`.
This method is the high-level specific scenario generator for the
"New Instances" (NI) case. Given a sequence of train and test datasets
creates the continual stream of data as a series of experiences. Each
experience will contain patterns belonging to the same classes.
The ``task_labels`` parameter determines if each incremental experience has
an increasing task label or if, at the contrary, a default task label "0"
has to be assigned to all experiences. This can be useful when
differentiating between Single-Incremental-Task and Multi-Task scenarios.
There are other important parameters that can be specified in order to tweak
the behaviour of the resulting scenario. Please take a few minutes to read
and understand them as they may save you a lot of work.
This generator features an integrated reproducibility mechanism that allows
the user to store and later re-load a scenario. For more info see the
``reproducibility_data`` parameter.
:param train_dataset: A list of training datasets, or a single dataset.
:param test_dataset: A list of test datasets, or a single test dataset.
:param n_experiences: The number of experiences.
:param task_labels: If True, each experience will have an ascending task
label. If False, the task label will be 0 for all the experiences.
:param shuffle: If True, patterns order will be shuffled.
:param seed: A valid int used to initialize the random number generator.
Can be None.
:param balance_experiences: If True, pattern of each class will be equally
spread across all experiences. If False, patterns will be assigned to
experiences in a complete random way. Defaults to False.
:param min_class_patterns_in_exp: The minimum amount of patterns of
every class that must be assigned to every experience. Compatible with
the ``balance_experiences`` parameter. An exception will be raised if
this constraint can't be satisfied. Defaults to 0.
:param fixed_exp_assignment: If not None, the pattern assignment
to use. It must be a list with an entry for each experience. Each entry
is a list that contains the indexes of patterns belonging to that
experience. Overrides the ``shuffle``, ``balance_experiences`` and
``min_class_patterns_in_exp`` parameters.
:param reproducibility_data: If not None, overrides all the other
scenario definition options, including ``fixed_exp_assignment``.
This is usually a dictionary containing data used to
reproduce a specific experiment. One can use the
``get_reproducibility_data`` method to get (and even distribute)
the experiment setup so that it can be loaded by passing it as this
parameter. In this way one can be sure that the same specific
experimental setup is being used (for reproducibility purposes).
Beware that, in order to reproduce an experiment, the same train and
test datasets must be used. Defaults to None.
:return: A properly initialized :class:`NIScenario` instance.
"""
warnings.warn('ni_scenario is deprecated in favor of ni_benchmark.')
seq_train_dataset, seq_test_dataset = train_dataset, test_dataset
if isinstance(train_dataset, list) or isinstance(train_dataset, tuple):
if len(train_dataset) != len(test_dataset):
raise ValueError('Train/test dataset lists must contain the '
'exact same number of datasets')
seq_train_dataset, seq_test_dataset, _ = \
concat_datasets_sequentially(train_dataset, test_dataset)
# Datasets should be instances of AvalancheDataset
seq_train_dataset = as_classification_dataset(seq_train_dataset).train()
seq_test_dataset = as_classification_dataset(seq_test_dataset).eval()
return NIScenario(seq_train_dataset,
seq_test_dataset,
n_experiences,
task_labels,
shuffle=shuffle,
seed=seed,
balance_experiences=balance_experiences,
min_class_patterns_in_exp=min_class_patterns_in_exp,
fixed_exp_assignment=fixed_exp_assignment,
reproducibility_data=reproducibility_data)