Fix feature names and types in output model slice. (#7078)

dmlc · Jul 6, 2021 · d7e1fa7 · d7e1fa7
1 parent ffa66aa
commit d7e1fa7
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diff --git a/src/learner.cc b/src/learner.cc
@@ -1032,6 +1032,8 @@ class LearnerImpl : public LearnerIO {
     out_impl->mparam_ = this->mparam_;
     out_impl->attributes_ = this->attributes_;
     out_impl->learner_model_param_ = this->learner_model_param_;
+    out_impl->SetFeatureNames(this->feature_names_);
+    out_impl->SetFeatureTypes(this->feature_types_);
     out_impl->LoadConfig(config);
     out_impl->Configure();
     return out_impl;

diff --git a/tests/python/test_basic_models.py b/tests/python/test_basic_models.py
@@ -379,10 +379,13 @@ def test_slice(self, booster):
             'num_parallel_tree': 4, 'subsample': 0.5, 'num_class': 3, 'booster': booster,
             'objective': 'multi:softprob'},
                             num_boost_round=num_boost_round, dtrain=dtrain)
+        booster.feature_types = ["q"] * X.shape[1]
+
         assert len(booster.get_dump()) == total_trees
         beg = 3
         end = 7
         sliced: xgb.Booster = booster[beg: end]
+        assert sliced.feature_types == booster.feature_types
 
         sliced_trees = (end - beg) * num_parallel_tree * num_classes
         assert sliced_trees == len(sliced.get_dump())