Try this Dockerfile?

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.7
+
+WORKDIR /code
+
+COPY ./requirements.txt /code/requirements.txt
+
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+COPY . .
+
+CMD ["bokeh", "serve", "naacl_demo", "--allow-websocket-origin=*"]

README.md

@@ -5,6 +5,7 @@ colorFrom: red
 colorTo: yellow
 sdk: docker
 pinned: false
+app_port: 5006
 ---
 
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference