pin versions of all python dependencies (#56)

Author: icywang86rui

docker/1.13/Dockerfile.cpu

@@ -41,7 +41,7 @@ ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1
 
 # cython, falcon, gunicorn
 RUN \
-    ${PIP} install cython falcon gunicorn gevent requests
+    ${PIP} install cython==0.29.10 falcon==2.0.0 gunicorn==19.9.0 gevent==1.4.0 requests==2.21.0
 
 COPY ./ /
 

docker/1.13/Dockerfile.gpu

@@ -92,11 +92,11 @@ RUN \
     apt-get clean
 
 RUN ${PIP} install -U --no-cache-dir awscli==1.16.130 \
-                                     cython \
-                                     falcon \
-                                     gunicorn \
-                                     gevent \
-                                     requests
+                                     cython==0.29.10 \
+                                     falcon==2.0.0 \
+                                     gunicorn==19.9.0 \
+                                     gevent==1.4.0 \
+                                     requests==2.21.0
 
 COPY ./ /