fix requirement and setup

requirements.txt

@@ -14,3 +14,4 @@ flake8
 tb-paddle
 tensorboard >= 1.15
 cma == 2.7.0
+sentencepiece

requirements_py2.txt

@@ -13,3 +13,4 @@ flask >= 1.1.0
 tb-paddle
 tensorboard >= 1.15
 cma == 2.7.0
+sentencepiece

setup.py

@@ -32,7 +32,8 @@ max_version, mid_version, min_version = python_version()
 
 REQUIRED_PACKAGES = [
     'six >= 1.10.0', 'protobuf >= 3.6.0', 'pyyaml', 'Pillow', 'requests',
-    'tb-paddle', 'tensorboard >= 1.15', 'cma == 2.7.0', 'flask >= 1.1.0'
+    'tb-paddle', 'tensorboard >= 1.15', 'cma == 2.7.0', 'flask >= 1.1.0',
+    'sentencepiece'
 ]
 
 if max_version < 3: