temporary fix python3 in _create_calcer
@@ -1436,7 +1436,7 @@ cdef class _MetricCalcerBase:
cdef _CatBoost __catboost
cpdef _create_calcer(self, metrics_description, int ntree_start, int ntree_end, int eval_period, int thread_count,
- str tmp_dir, bool_t delete_temp_dir_on_exit):
+ tmp_dir, bool_t delete_temp_dir_on_exit):
thread_count=UpdateThreadCount(thread_count);
cdef TVector[TString] metricsDescription
for metric_description in metrics_description:
