How to set initial_weight and weight_target at detectnet_v2 spec file?

How can I set the followings initial_weight and weight_target in detectnet_v2 spec file?
Where can I find reference or any paper?

objectives {
name: “cov”
initial_weight: 1.0
weight_target: 1.0
}
objectives {
name: “bbox”
initial_weight: 10.0
weight_target: 1.0
}

Refer to Tlt spec file - cost function