diff --git a/alpha_automl/utils.py b/alpha_automl/utils.py
index 66eedc10..73313108 100644
--- a/alpha_automl/utils.py
+++ b/alpha_automl/utils.py
@@ -8,6 +8,7 @@
 import numpy as np
 import pandas as pd
 import torch
+from enum import Enum
 from sklearn.compose import ColumnTransformer
 from sklearn.preprocessing import LabelEncoder
 from sklearn.model_selection import ShuffleSplit, train_test_split
@@ -24,6 +25,25 @@
 RANDOM_SEED = 0
 
 
+class PrimitiveType(Enum):
+    IMPUTER = 'IMPUTER'
+    CATEGORICAL_ENCODER = 'CATEGORICAL_ENCODER'
+    DATETIME_ENCODER = 'DATETIME_ENCODER'
+    TEXT_ENCODER = 'TEXT_ENCODER'
+    IMAGE_ENCODER = 'IMAGE_ENCODER'
+    FEATURE_SCALER = 'FEATURE_SCALER'
+    FEATURE_SELECTOR = 'FEATURE_SELECTOR'
+    COLUMN_TRANSFORMER = 'COLUMN_TRANSFORMER'
+    TIME_SERIES_FORECASTER = 'TIME_SERIES_FORECASTER'
+    CLASSIFIER = 'CLASSIFIER'
+    REGRESSOR = 'REGRESSOR'
+    CLUSTERER = 'CLUSTERER'
+    SINGLE_ENSEMBLER = 'SINGLE_ENSEMBLER'
+    MULTI_ENSEMBLER = 'MULTI_ENSEMBLER'
+    SEMISUPERVISED_SELFTRAINER = 'SEMISUPERVISED_SELFTRAINER'
+    SEMISUPERVISED_LABELPROPAGATOR = 'SEMISUPERVISED_LABELPROPAGATOR'
+
+
 def create_object(import_path, class_params=None):
     if class_params is None:
         class_params = {}