diff --git a/fastNLP/__init__.py b/fastNLP/__init__.py
index ce68d5f3..85b9831e 100644
--- a/fastNLP/__init__.py
+++ b/fastNLP/__init__.py
@@ -69,6 +69,8 @@ __all__ = [
     "BCELoss",
     "NLLLoss",
     "LossInForward",
+    "LossBase",
+    "CMRC2018Loss",
     
     "cache_results",