Utilizes dfoptim::hjk to obtain parameter estimates. Requires that the objective function be defined by the calling learning method. Returns NULL if optimization is not successful due to problems or the list object returned by dfoptim::hjk if optimization is successful.
## S4 method for signature 'HingeSurrogate' .phiFunc(surrogate, u) ## S4 method for signature 'HingeSurrogate' .dPhiFunc(surrogate, u, du) ## S4 method for signature 'HingeSurrogate' .optim(surrogate, par, lambda, fn, gr, suppress, ...)
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