Welcome to Continuum’s documentation!

Continuum is the library you need for Continual Learning. It supports many datasets and most scenarios (NC, NI, NIC, etc.).

Continuum is made of two parts: Dataset and Scenario. The former is about the actual dataset with sometimes minor modifications to fit in the Continual paradigm. The latter is about the different setting you may encounter in Continual Learning.

Quick Example

Let’s have a quick look with an example. We want to evaluate our model on a split-MNIST. First, we initialize the dataset; if the data isn’t present at the given path, we’ll download it for you! All datasets but ImageNet have this feature.

Then we specify our dataset, here it is ClassIncremental (New Classes NC) where each task brings new classes. Our first task is made of 5 classes (initial_increment=5), then all 5 following tasks will be made of a single new class each:

from torch.utils.data import DataLoader

from continuum import ClassIncremental, split_train_val
from continuum.datasets import MNIST

dataset = MNIST("my/data/path", download=True, train=True)

cl_scenario = ClassIncremental(

print(f"Number of classes in scenario: {cl_scenario.nb_classes}.")
print(f"Number of tasks in scenario: {cl_scenario.nb_tasks}.")

for task_id, train_dataset in enumerate(cl_scenario):
   train_dataset, val_dataset = split_train_val(train_dataset, val_split=0.1)
   train_loader = DataLoader(train_dataset)
   val_loader = DataLoader(val_dataset)

   # Do your cool stuff here

The continual loader, here named cl_scenario is an iterable. Each loop provides then the dataset for a task. We split the dataset into a train and validation subset with our utility split_train_val.

Note that if we wanted to use the test subset, we need to specify it when creating the scenario.

Finally, after training on the 6 tasks, we want to evaluate our model performance on the test set:

cl_scenario_test = ClassIncremental(

From this loader, we can get the first task cl_scenario_test[0], all tasks up to the third task cl_scenario_test[:3], or even all tasks cl_scenario_test[:]. You can slice any loaders like you would do with Python’s List. You can also slide the scenario with a list (for example cl_scenario_test[[0,2,3,4]] ).

This library was developped by Arthur Douillard and Timothée Lesort. If you have any new feature request or want to report a bug, please open an issue here. We are also open to pull requests!