Use of `CallWith` in attack objectives and gains?

[dxoigmn]

Why do attack objectives and gains use CallWith?

MART/mart/configs/attack/gain/modular.yaml

Line 1 in 9d1a03d

_target_: mart.nn.CallWith

MART/mart/configs/attack/objective/object_detection_missed.yaml

Line 1 in 9d1a03d

_target_: mart.nn.CallWith

Shouldn't we just be able to pass these arguments in using sequences? Or what is going on here?