transform

Modules

`add_slack_vars`
`discrete_vars`
`eliminate_fixed_vars`
`equality_transform`
`expand_connectors`
`hierarchy`
`logical_to_linear`	Transformation from BooleanVar and LogicalConstraint to Binary and Constraints.
`lp_dual`
`model`
`nonnegative_transform`
`radix_linearization`
`relax_integrality`
`scaling`
`standard_form`
`util`