[R] Something is wrong; all the MAE metric values are missing

Ivan Krylov kry|ov@r00t @end|ng |rom gm@||@com
Wed Dec 25 18:06:15 CET 2019

Try printing the value of `param` in your `obj` function before calling
train() or getTrainPerf(). Optimizers are prone to giving unexpected
values [*] in trying to lower the loss function. It might be the case
of an unconstrained optimizer leaving the realm of the feasible because
no-one told it not to.

Best regards,

[*] See e.g. https://arxiv.org/abs/1803.03453 for examples of very
unorthodox ways of gaming the fitness fuction

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