Addition of gangbo-mccann map estimators using twist operator #500
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Previous implementation of potential -> Monge map estimator was resting on the TI formula,$T(x) = x - \nabla h^* \circ \nabla f(x)$ . This PR opens up the API to handle the more general formula $T(x) = \nabla_{1}c(x,\cdot)^{-1}\circ \nabla f(x)$ . This adds
twisted_operator
methods to arbitraryCostFn
.