Remove old callback deprecated in 1.3. (#7280)

tests/python/test_basic.py

@@ -76,23 +76,6 @@ class TestBasic:
             predt_1 = booster.predict(dtrain)
             np.testing.assert_allclose(predt_0, predt_1)
 
-    def test_record_results(self):
-        dtrain = xgb.DMatrix(dpath + 'agaricus.txt.train')
-        dtest = xgb.DMatrix(dpath + 'agaricus.txt.test')
-        param = {'max_depth': 2, 'eta': 1, 'verbosity': 0,
-                 'objective': 'binary:logistic', 'eval_metric': 'error'}
-        # specify validations set to watch performance
-        watchlist = [(dtest, 'eval'), (dtrain, 'train')]
-        num_round = 2
-        result = {}
-        res2 = {}
-        xgb.train(param, dtrain, num_round, watchlist,
-                  callbacks=[xgb.callback.record_evaluation(result)])
-        xgb.train(param, dtrain, num_round, watchlist,
-                  evals_result=res2)
-        assert result['train']['error'][0] < 0.1
-        assert res2 == result
-
     def test_multiclass(self):
         dtrain = xgb.DMatrix(dpath + 'agaricus.txt.train')
         dtest = xgb.DMatrix(dpath + 'agaricus.txt.test')
@@ -254,8 +237,18 @@ class TestBasic:
         ]
 
         # Use callback to log the test labels in each fold
-        def cb(cbackenv):
-            print([fold.dtest.get_label() for fold in cbackenv.cvfolds])
+        class Callback(xgb.callback.TrainingCallback):
+            def __init__(self) -> None:
+                super().__init__()
+
+            def after_iteration(
+                self, model,
+                epoch: int,
+                evals_log: xgb.callback.TrainingCallback.EvalsLog
+            ):
+                print([fold.dtest.get_label() for fold in model.cvfolds])
+
+        cb = Callback()
 
         # Run cross validation and capture standard out to test callback result
         with tm.captured_output() as (out, err):