def init_app(app):
    app.jinja_env.filters.update(filters)
    return app
Transforms index to one-hot representation, for example
dataset/ETHPy150Open willowtreeapps/tango-core/tango/filters.py/init_app--crossover with--dataset/ETHPy150Open LxMLS/lxmls-toolkit/lxmls/deep_learning/mlp.py/index2onehot