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Document that non-zero return value of a callback is used as return value of lbfgs() #37

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Document that non-zero return value of a callback is used as return value of lbfgs() #37

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5 changes: 3 additions & 2 deletions include/lbfgs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -400,8 +400,9 @@ typedef lbfgsfloatval_t (*lbfgs_evaluate_t)(
* @param n The number of variables.
* @param k The iteration count.
* @param ls The number of evaluations called for this iteration.
* @retval int Zero to continue the optimization process. Returning a
* non-zero value will cancel the optimization process.
* @retval int Zero (#LBFGS_SUCCESS) to continue the optimization process.
* Returning a non-zero value will cancel the optimization
* process and lbfgs() returns the value as its return value.
*/
typedef int (*lbfgs_progress_t)(
void *instance,
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