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print_evaluation callback output on last iteration (#2036)

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verbose_eval docs claim it will log the last iteration (http://xgboost.readthedocs.io/en/latest/python/python_api.html#xgboost.train). this is also consistent w/the behavior from 0.4. not a huge deal but I found it handy to see the last iter's result b/c my period is usually large.

this doesn't address logging the last stage found by early_stopping (as noted in docs) as I'm not sure how to do that.
This commit is contained in:
Eric Liu 2017-02-24 20:06:48 -08:00 committed by Yuan (Terry) Tang
parent b4d97d3cb8
commit 7927031ffe
1 changed files with 4 additions and 1 deletions
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python-package/xgboost/callback.py
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@ -32,6 +32,9 @@ def _fmt_metric(value, show_stdv=True):
def print_evaluation(period=1, show_stdv=True): def print_evaluation(period=1, show_stdv=True):
"""Create a callback that print evaluation result. """Create a callback that print evaluation result.
We print the evaluation results every ``period`` iterations
and on the first and the last iterations.
Parameters Parameters
---------- ----------
period : int period : int
@ -50,7 +53,7 @@ def print_evaluation(period=1, show_stdv=True):
if env.rank != 0 or len(env.evaluation_result_list) == 0 or period is False: if env.rank != 0 or len(env.evaluation_result_list) == 0 or period is False:
return return
i = env.iteration i = env.iteration
if (i % period == 0 or i + 1 == env.begin_iteration): if (i % period == 0 or i + 1 == env.begin_iteration or i + 1 == env.end_iteration):
msg = '\t'.join([_fmt_metric(x, show_stdv) for x in env.evaluation_result_list]) msg = '\t'.join([_fmt_metric(x, show_stdv) for x in env.evaluation_result_list])
rabit.tracker_print('[%d]\t%s\n' % (i, msg)) rabit.tracker_print('[%d]\t%s\n' % (i, msg))
return callback return callback