A Reference Class for diagnosing convergence.
par_prev
A numeric vector, previous checked parameter value.
fn_prev
Double, previous checked function value.
grad_prev
A numeric vector, previous checked gradient value.
tol_rel
Double, relative tolerance for signaling convergence.
check_converge(par, fn, grad)
Check if the difference in parameters, function value, or gradient values reached below tolerances.
initialize(tol)
Initializes previous checked values at 0.
@param tol Tolerance threshold used for all tolerance checks.
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