`future_prices` is initialized to `None`, https://github.com/tradytics/eiten/blob/master/data_loader.py#L51 If `is_test` is not `1`, `future_prices` doesn't change, https://github.com/tradytics/eiten/blob/master/data_loader.py#L99 `future_prices` as `None` is called with `.values`, https://github.com/tradytics/eiten/blob/master/data_loader.py#L111
future_pricesis initialized toNone, https://github.com/tradytics/eiten/blob/master/data_loader.py#L51If
is_testis not1,future_pricesdoesn't change, https://github.com/tradytics/eiten/blob/master/data_loader.py#L99future_pricesasNoneis called with.values, https://github.com/tradytics/eiten/blob/master/data_loader.py#L111