The Chain class.
This class represents a reduction that replaces symbolic parameters with their constraint values.
## S4 method for signature 'Chain' as.character(x) ## S4 method for signature 'Chain,Problem' accepts(object, problem) ## S4 method for signature 'Chain,Problem' perform(object, problem) ## S4 method for signature 'Chain,SolutionORList,list' invert(object, solution, inverse_data)
accepts: A problem is accepted if the sequence of reductions is valid. In particular, the i-th reduction must accept the output of the i-1th
reduction, with the first reduction (self.reductions[0]) in the sequence taking as input the supplied problem.
perform: Applies the chain to a problem and returns an equivalent problem.
invert: Performs the reduction on a problem and returns an equivalent problem.
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