diff --git a/CHANGELOG.md b/CHANGELOG.md
index caa060fe..8544cd30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,16 @@
 Changelog
 =========
 
+Version 0.81.6
+--------------
+* updated documentation
+* updated crema-d
+* updated tests
+
+Version 0.81.5
+--------------
+* added sex=gender for speaker mappings
+
 Version 0.81.4
 --------------
 * fixed bug in demo module
diff --git a/data/crema-d/README.md b/data/crema-d/README.md
new file mode 100644
index 00000000..ac728b36
--- /dev/null
+++ b/data/crema-d/README.md
@@ -0,0 +1,18 @@
+This folder is to import the Crowd-sourced Emotional Multimodal Actors Dataset (CREMA-D) database to nkululeko. 
+
+Labels are: 'angry', 'disgust', 'fear', 'happy', 'neutral', 'sad'.
+
+Based on the [audb version](https://github.com/audeering/crema-d)
+
+Load the database with python:
+```bash
+$ python load_db.py
+```
+**inside** the crema-d folder!
+
+then, as a test, you might do
+
+```bash
+python -m nkululeko.nkululeko --config data/crema-d/test_age.ini
+python -m nkululeko.nkululeko --config data/crema-d/test_emotion.ini
+```
diff --git a/data/crema-d/load_db.py b/data/crema-d/load_db.py
new file mode 100644
index 00000000..86d97581
--- /dev/null
+++ b/data/crema-d/load_db.py
@@ -0,0 +1,11 @@
+import os
+
+import audb
+
+
+# set download directory to current
+cwd = os.getcwd()
+audb.config.CACHE_ROOT = cwd
+
+# load the latest version of the data
+db = audb.load("crema-d", format="wav", sampling_rate=16000, mixdown=True)
diff --git a/data/crema-d/test_age.ini b/data/crema-d/test_age.ini
new file mode 100644
index 00000000..9357fea3
--- /dev/null
+++ b/data/crema-d/test_age.ini
@@ -0,0 +1,22 @@
+[EXP]
+root = ./data/crema-d/
+name = results_age
+type = regression
+[DATA]
+databases = ['data']
+data = ./data/crema-d/crema-d/1.3.0/fe182b91/
+data.split_strategy = specified
+data.colnames = {'sex':'gender'}
+data.files_table = ['files']
+data.test_tables = ['age.test']
+data.train_tables = ['age.dev', 'age.train']
+target = age
+labels = ['20ies','30ies', '40ies', '50ies', '60ies']
+bins  = [-100000, 30, 40, 50, 60, 100000]
+[FEATS]
+type = ['os']
+scale = standard
+[MODEL]
+type = svr
+C_val = 10
+measure = ccc
diff --git a/data/crema-d/test_emotion.ini b/data/crema-d/test_emotion.ini
new file mode 100644
index 00000000..c1f518cf
--- /dev/null
+++ b/data/crema-d/test_emotion.ini
@@ -0,0 +1,20 @@
+[EXP]
+root = ./data/crema-d/
+name = results_emotion
+[DATA]
+databases = ['data']
+data = ./data/crema-d/crema-d/1.3.0/fe182b91/
+data.split_strategy = specified
+data.colnames = {'sex':'gender'}
+data.files_table = ['files']
+data.target_tables = ['emotion.categories.desired.test','emotion.categories.desired.train', 'emotion.categories.desired.dev']
+data.test_tables = ['emotion.categories.desired.test']
+data.train_tables = ['emotion.categories.desired.train', 'emotion.categories.desired.dev']
+target = emotion
+labels = ['anger', 'disgust', 'fear', 'happiness', 'neutral', 'sadness']
+[FEATS]
+type = ['os']
+scale = standard
+[MODEL]
+type = svm
+C_val = 10
diff --git a/nkululeko/constants.py b/nkululeko/constants.py
index a1cec53d..6124ca81 100644
--- a/nkululeko/constants.py
+++ b/nkululeko/constants.py
@@ -1,2 +1,2 @@
-VERSION="0.81.4"
+VERSION="0.81.6"
 SAMPLING_RATE = 16000
diff --git a/nkululeko/data/dataset.py b/nkululeko/data/dataset.py
index 87acca4c..8c6a8cec 100644
--- a/nkululeko/data/dataset.py
+++ b/nkululeko/data/dataset.py
@@ -76,6 +76,7 @@ def _check_cols(self, df):
         if rename_cols:
             col_dict = ast.literal_eval(rename_cols)
             df = df.rename(columns=col_dict)
+            self.util.debug(f"renamed data columns: {col_dict}")
         return df
 
     def _report_load(self):
@@ -281,13 +282,19 @@ def _get_df_for_lists(self, db, df_files):
                 # try to get the age values
                 df_local["age"] = source_df["age"].astype(int)
                 got_age = True
-            except (KeyError, ValueError, audformat.errors.BadKeyError) as e:
+            except (KeyError, ValueError, audformat.errors.BadKeyError):
                 pass
             try:
                 # also it might be possible that the sex is part of the speaker description
                 df_local["gender"] = db[table]["speaker"].get(map="gender")
                 got_gender = True
-            except (ValueError, audformat.errors.BadKeyError) as e:
+            except (ValueError, audformat.errors.BadKeyError):
+                pass
+            try:
+                # also it might be possible that the sex is part of the speaker description
+                df_local["gender"] = db[table]["speaker"].get(map="sex")
+                got_gender = True
+            except (ValueError, audformat.errors.BadKeyError):
                 pass
             try:
                 # also it might be possible that the age is part of the speaker description
diff --git a/nkululeko/experiment.py b/nkululeko/experiment.py
index d66dd359..5ecf041d 100644
--- a/nkululeko/experiment.py
+++ b/nkululeko/experiment.py
@@ -695,7 +695,7 @@ def save(self, filename):
             pickle.dump(self.__dict__, f)
             f.close()
         except TypeError:
-            self.feature_extractor.featExtractor.model = None
+            self.feature_extractor.feat_extractor.model = None
             f = open(filename, "wb")
             pickle.dump(self.__dict__, f)
             f.close()
diff --git a/nkululeko/feat_extract/feats_agender.py b/nkululeko/feat_extract/feats_agender.py
index 87392196..fc47bf98 100644
--- a/nkululeko/feat_extract/feats_agender.py
+++ b/nkululeko/feat_extract/feats_agender.py
@@ -32,10 +32,7 @@ def _load_model(self):
             audeer.extract_archive(archive_path, model_root)
         device = self.util.config_val("MODEL", "device", "cpu")
         self.model = audonnx.load(model_root, device=device)
-        pytorch_total_params = sum(p.numel() for p in self.model.parameters())
-        self.util.debug(
-            f"initialized agender model with {pytorch_total_params} parameters in total"
-        )
+        self.util.debug(f"initialized agender model")
         self.model_loaded = True
 
     def extract(self):
diff --git a/nkululeko/feat_extract/feats_audmodel_dim.py b/nkululeko/feat_extract/feats_auddim.py
similarity index 93%
rename from nkululeko/feat_extract/feats_audmodel_dim.py
rename to nkululeko/feat_extract/feats_auddim.py
index da7e7eea..e9d3cbab 100644
--- a/nkululeko/feat_extract/feats_audmodel_dim.py
+++ b/nkululeko/feat_extract/feats_auddim.py
@@ -13,11 +13,12 @@
 import nkululeko.glob_conf as glob_conf
 
 
-class AudModelDimSet(Featureset):
-    """
-    Emotional dimensions from the wav2vec2. based model finetuned on MSPPodcast emotions, described in the paper
+class AuddimSet(Featureset):
+    """Emotional dimensions from the wav2vec2 model finetuned on MSPPodcast emotions.
+
+    Described in the paper
     "Dawn of the transformer era in speech emotion recognition: closing the valence gap"
-    https://arxiv.org/abs/2203.07378
+    https://arxiv.org/abs/2203.07378.
     """
 
     def __init__(self, name, data_df):
diff --git a/nkululeko/feat_extract/feats_audmodel.py b/nkululeko/feat_extract/feats_audmodel.py
index f8c5accd..c2f890f4 100644
--- a/nkululeko/feat_extract/feats_audmodel.py
+++ b/nkululeko/feat_extract/feats_audmodel.py
@@ -11,11 +11,12 @@
 from nkululeko.feat_extract.featureset import Featureset
 
 
-class AudModelSet(Featureset):
-    """
-    Embeddings from the wav2vec2. based model finetuned on MSPPodcast emotions, described in the paper
+class AudmodelSet(Featureset):
+    """Embeddings from the wav2vec2 based model finetuned on MSPPodcast emotions.
+
+    Described in the paper:
     "Dawn of the transformer era in speech emotion recognition: closing the valence gap"
-    https://arxiv.org/abs/2203.07378
+    https://arxiv.org/abs/2203.07378.
     """
 
     def __init__(self, name, data_df):
diff --git a/nkululeko/feat_extract/feats_import.py b/nkululeko/feat_extract/feats_import.py
index dfe64382..163f371a 100644
--- a/nkululeko/feat_extract/feats_import.py
+++ b/nkululeko/feat_extract/feats_import.py
@@ -8,7 +8,7 @@
 from nkululeko.feat_extract.featureset import Featureset
 
 
-class Importset(Featureset):
+class ImportSet(Featureset):
     """Class to import features that have been compiled elsewhere"""
 
     def __init__(self, name, data_df):
diff --git a/nkululeko/feat_extract/feats_mos.py b/nkululeko/feat_extract/feats_mos.py
index b1c091dc..abd8ea2e 100644
--- a/nkululeko/feat_extract/feats_mos.py
+++ b/nkululeko/feat_extract/feats_mos.py
@@ -10,6 +10,7 @@
 pip install --pre torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/nightly/cpu
 
 """
+
 import os
 import pandas as pd
 from tqdm import tqdm
@@ -23,7 +24,7 @@
 from nkululeko.feat_extract.featureset import Featureset
 
 
-class MOSSet(Featureset):
+class MosSet(Featureset):
     """Class to predict MOS (mean opinion score)"""
 
     def __init__(self, name, data_df):
diff --git a/nkululeko/feat_extract/feats_praat.py b/nkululeko/feat_extract/feats_praat.py
index 3aea395d..369e3691 100644
--- a/nkululeko/feat_extract/feats_praat.py
+++ b/nkululeko/feat_extract/feats_praat.py
@@ -1,17 +1,19 @@
 # feats_praat.py
-from nkululeko.feat_extract.featureset import Featureset
+import ast
 import os
-import pandas as pd
+
 import numpy as np
-import nkululeko.glob_conf as glob_conf
+import pandas as pd
+
 from nkululeko.feat_extract import feinberg_praat
-import ast
+from nkululeko.feat_extract.featureset import Featureset
+import nkululeko.glob_conf as glob_conf
 
 
-class Praatset(Featureset):
-    """
-    a feature extractor for the Praat software, based on
-    David R. Feinberg's Praat scripts for the parselmouth python interface.
+class PraatSet(Featureset):
+    """A feature extractor for the Praat software.
+
+    Based on David R. Feinberg's Praat scripts for the parselmouth python interface.
     https://osf.io/6dwr3/
 
     """
diff --git a/nkululeko/feat_extract/feats_squim.py b/nkululeko/feat_extract/feats_squim.py
index ac14f53a..4fc9bd02 100644
--- a/nkululeko/feat_extract/feats_squim.py
+++ b/nkululeko/feat_extract/feats_squim.py
@@ -1,36 +1,33 @@
-""" feats_squim.py
-predict SQUIM ( SPEECH QUALITY AND INTELLIGIBILITY
-MEASURES) features
+"""Predict SQUIM ( SPEECH QUALITY AND INTELLIGIBILITY MEASURES) features.
 
-
-    Wideband Perceptual Estimation of Speech Quality (PESQ) [2]
-    Short-Time Objective Intelligibility (STOI) [3]
-    Scale-Invariant Signal-to-Distortion Ratio (SI-SDR) [4]
-
-
-adapted from
+Wideband Perceptual Estimation of Speech Quality (PESQ) [2].
+    Short-Time Objective Intelligibility (STOI) [3].
+    Scale-Invariant Signal-to-Distortion Ratio (SI-SDR) [4].
+Adapted from
 from https://pytorch.org/audio/main/tutorials/squim_tutorial.html#sphx-glr-tutorials-squim-tutorial-py
-paper: https://arxiv.org/pdf/2304.01448.pdf
-
-needs 
+paper: https://arxiv.org/pdf/2304.01448.pdf.
+Needs
 pip uninstall -y torch torchvision torchaudio
 pip install --pre torch torchvision torchaudio --extra-index-url https://download.pytorch.org/whl/nightly/cpu
 
 """
 
 import os
-from tqdm import tqdm
+
 import pandas as pd
 import torch
 import torchaudio
 from torchaudio.pipelines import SQUIM_OBJECTIVE
+from tqdm import tqdm
+
 import audiofile
+
+from nkululeko.feat_extract.featureset import Featureset
 import nkululeko.glob_conf as glob_conf
 from nkululeko.utils.util import Util
-from nkululeko.feat_extract.featureset import Featureset
 
 
-class SQUIMSet(Featureset):
+class SquimSet(Featureset):
     """Class to predict SQUIM features"""
 
     def __init__(self, name, data_df):
diff --git a/nkululeko/feature_extractor.py b/nkululeko/feature_extractor.py
index fd797588..a5f8f5bf 100644
--- a/nkululeko/feature_extractor.py
+++ b/nkululeko/feature_extractor.py
@@ -39,34 +39,51 @@ def extract(self):
         self.feats = pd.DataFrame()
         for feats_type in self.feats_types:
             store_name = f"{self.data_name}_{feats_type}"
-            feat_extractor = self._get_feat_extractor(store_name, feats_type)
-            feat_extractor.extract()
-            feat_extractor.filter()
-            self.feats = pd.concat([self.feats, feat_extractor.df], axis=1)
+            self.feat_extractor = self._get_feat_extractor(store_name, feats_type)
+            self.feat_extractor.extract()
+            self.feat_extractor.filter()
+            self.feats = pd.concat([self.feats, self.feat_extractor.df], axis=1)
         return self.feats
 
     def extract_sample(self, signal, sr):
-        return self.featExtractor.extract_sample(signal, sr)
+        return self.feat_extractor.extract_sample(signal, sr)
 
     def _get_feat_extractor(self, store_name, feats_type):
         feat_extractor_class = self._get_feat_extractor_class(feats_type)
         if feat_extractor_class is None:
             self.util.error(f"unknown feats_type: {feats_type}")
-        return feat_extractor_class(f"{store_name}_{self.feats_designation}", self.data_df)
+        return feat_extractor_class(
+            f"{store_name}_{self.feats_designation}", self.data_df
+        )
 
     def _get_feat_extractor_class(self, feats_type):
         if feats_type == "os":
             from nkululeko.feat_extract.feats_opensmile import Opensmileset
+
             return Opensmileset
         elif feats_type == "spectra":
             from nkululeko.feat_extract.feats_spectra import Spectraloader
+
             return Spectraloader
         elif feats_type == "trill":
             from nkululeko.feat_extract.feats_trill import TRILLset
+
             return TRILLset
         elif feats_type.startswith(("wav2vec", "hubert", "wavlm", "spkrec")):
             return self._get_feat_extractor_by_prefix(feats_type)
-        elif feats_type in ("audmodel", "auddim", "agender", "agender_agender", "snr", "mos", "squim", "clap", "praat", "mld", "import"):
+        elif feats_type in (
+            "audmodel",
+            "auddim",
+            "agender",
+            "agender_agender",
+            "snr",
+            "mos",
+            "squim",
+            "clap",
+            "praat",
+            "mld",
+            "import",
+        ):
             return self._get_feat_extractor_by_name(feats_type)
         else:
             return None
@@ -74,14 +91,14 @@ def _get_feat_extractor_class(self, feats_type):
     def _get_feat_extractor_by_prefix(self, feats_type):
         prefix, _, ext = feats_type.partition("_")
         from importlib import import_module
-        module = import_module(
-            f"nkululeko.feat_extract.feats_{prefix.lower()}")
+
+        module = import_module(f"nkululeko.feat_extract.feats_{prefix.lower()}")
         class_name = f"{prefix.capitalize()}{ext.capitalize()}set"
         return getattr(module, class_name)
 
     def _get_feat_extractor_by_name(self, feats_type):
         from importlib import import_module
-        module = import_module(
-            f"nkululeko.feat_extract.feats_{feats_type.lower()}")
+
+        module = import_module(f"nkululeko.feat_extract.feats_{feats_type.lower()}")
         class_name = f"{feats_type.capitalize()}Set"
         return getattr(module, class_name)
diff --git a/nkululeko/test_predictor.py b/nkululeko/test_predictor.py
index 2c9d8fea..dc9a88f2 100644
--- a/nkululeko/test_predictor.py
+++ b/nkululeko/test_predictor.py
@@ -62,3 +62,4 @@ def predict_and_store(self):
                 df = df.drop(columns=[target])
                 df = df.rename(columns={"class_label": target})
             df.to_csv(self.name)
+        self.util.debug(f"results stored in {self.name}")
diff --git a/tests/data_roots.ini b/tests/data_roots.ini
index 4a618a05..b1cf39d5 100644
--- a/tests/data_roots.ini
+++ b/tests/data_roots.ini
@@ -4,6 +4,11 @@ emodb.split_strategy = specified
 emodb.test_tables = ['emotion.categories.test.gold_standard']
 emodb.train_tables = ['emotion.categories.train.gold_standard']
 emodb.mapping = {'anger':'angry', 'happiness':'happy', 'sadness':'sad', 'neutral':'neutral'}
-polish = ./data/polish_emo
-polish.mapping = {'anger':'angry', 'joy':'happy', 'sadness':'sad', 'neutral':'neutral'}
-polish.test_size = 30
+crema-d = ./data/crema-d/crema-d/1.3.0/fe182b91/
+crema-d.split_strategy = specified
+crema-d.colnames = {'sex':'gender'}
+crema-d.files_table = ['files']
+crema-d.target_tables = ['emotion.categories.desired.test','emotion.categories.desired.train', 'emotion.categories.desired.dev']
+crema-d.test_tables = ['emotion.categories.desired.test']
+crema-d.train_tables = ['emotion.categories.desired.train', 'emotion.categories.desired.dev']
+crema-d.mapping = {'anger':'angry', 'happiness':'happy', 'sadness':'sad', 'neutral':'neutral'}
diff --git a/tests/exp_agedb_os_mlp.ini b/tests/exp_agedb_os_mlp.ini
index b073d530..e9eac397 100644
--- a/tests/exp_agedb_os_mlp.ini
+++ b/tests/exp_agedb_os_mlp.ini
@@ -3,7 +3,7 @@ root = ./tests/results/
 name = exp_agedb
 type = regression
 runs = 1
-epochs = 25
+epochs = 50
 save = True
 [DATA]
 databases = ['emodb']
@@ -23,7 +23,7 @@ layers = {'l1':1024, 'l2':128}
 drop = .4
 loss = 1-ccc
 measure = ccc
-save = True
+patience = 5
 [PLOT]
 best_model = True
 epoch_progression = True
diff --git a/tests/exp_emodb_os_mlp.ini b/tests/exp_emodb_os_mlp.ini
index 2168c745..aa6edf5a 100644
--- a/tests/exp_emodb_os_mlp.ini
+++ b/tests/exp_emodb_os_mlp.ini
@@ -1,8 +1,8 @@
 [EXP]
 root = ./tests/results/
-name = exp_emodb_os_mlp
+name = exp_emodb
 runs = 1
-epochs = 50
+epochs = 500
 save = True
 [DATA]
 databases = ['emodb']
@@ -10,15 +10,9 @@ emodb = ./data/emodb/emodb
 emodb.split_strategy = specified
 emodb.test_tables = ['emotion.categories.test.gold_standard']
 emodb.train_tables = ['emotion.categories.train.gold_standard']
-labels = ['angry', 'happy', 'neutral', 'sad']
-emodb.mapping = {'anger':'angry', 'happiness':'happy', 'sadness':'sad', 'neutral':'neutral'}
-emodb.limit = 350
 target = emotion
 [FEATS]
 type = ['os']
-#type = ['audmodel']
-; type = ['wav2vec']
-; wav2vec.model = ../wav2vec2-embeddings/wav2vec2-large-robust-ft-swbd-300h/
 scale = standard
 [MODEL]
 type = mlp
diff --git a/tests/exp_emodb_os_xgb.ini b/tests/exp_emodb_os_xgb.ini
index ddda1ebb..c2ac7053 100644
--- a/tests/exp_emodb_os_xgb.ini
+++ b/tests/exp_emodb_os_xgb.ini
@@ -7,15 +7,15 @@ save = True
 [DATA]
 databases = ['emodb']
 emodb = ./data/emodb/emodb
-#emodb.split_strategy = specified
-#emodb.test_tables = ['emotion.categories.test.gold_standard']
-#emodb.train_tables = ['emotion.categories.train.gold_standard']
-#emodb.mapping = {'anger':'angry', 'happiness':'happy', 'sadness':'sad', 'neutral':'neutral'}
-#labels = ['angry', 'happy', 'neutral', 'sad']
+emodb.split_strategy = specified
+emodb.test_tables = ['emotion.categories.test.gold_standard']
+emodb.train_tables = ['emotion.categories.train.gold_standard']
+emodb.mapping = {'anger':'angry', 'happiness':'happy', 'sadness':'sad', 'neutral':'neutral'}
+labels = ['angry', 'happy', 'neutral', 'sad']
 target = emotion
 [FEATS]
 type = ['os']
 store_format = csv 
 scale = standard
 [MODEL]
-type = xgb
\ No newline at end of file
+type = xgb
diff --git a/tests/exp_emodb_os_xgb_test.ini b/tests/exp_emodb_os_xgb_test.ini
index 7ff0576d..e0c86f7e 100644
--- a/tests/exp_emodb_os_xgb_test.ini
+++ b/tests/exp_emodb_os_xgb_test.ini
@@ -6,8 +6,7 @@ save = True
 databases = ['emodb']
 root_folders = tests/data_roots.ini
 target = emotion
-tests = ['polish']
-polish.split_strategy = speaker_split
+tests = ['crema-d']
 labels = ['angry', 'happy', 'neutral', 'sad']
 no_reuse = True
 [FEATS]
diff --git a/tests/exp_multidb.ini b/tests/exp_multidb.ini
index 9f7d0e51..f681a3e6 100644
--- a/tests/exp_multidb.ini
+++ b/tests/exp_multidb.ini
@@ -1,9 +1,10 @@
 [EXP]
 root = ./tests/results/multidb
 epochs = 100
-databases = ['emodb', 'polish']
+databases = ['emodb', 'crema-d']
 [DATA]
 root_folders = ./tests/data_roots.ini
+crema-d.limit_samples = 1000
 target = emotion
 labels = ['neutral', 'happy', 'sad', 'angry']
 [FEATS]