Merge branch 'experimental' into 'develop'

declearn/dataset/__init__.py

declearn/dataset/_inmemory.py

declearn/dataset/_split_data.py

declearn/dataset/examples/__init__.py

declearn/dataset/examples/_heart_uci.py

declearn/dataset/examples/_mnist.py

declearn/dataset/utils/__init__.py

declearn/dataset/utils/_save_load.py

declearn/dataset/utils/_sparse.py

declearn/dataset/utils/_split_classif.py

declearn/main/utils/_training.py

declearn/quickrun/__init__.py

declearn/quickrun/_config.py

declearn/quickrun/_parser.py

declearn/quickrun/_run.py

declearn/test_utils/__init__.py

declearn/test_utils/_vectors.py

declearn/utils/__init__.py

declearn/utils/_logging.py

declearn/utils/_multiprocess.py