tweak process handoff

Dockerfile

@@ -23,12 +23,13 @@ RUN apt -qq update && apt -qq install --no-install-recommends -y \
         # python-prctl \
         numpy \
         imutils \
+        scipy \
+    && python3.7 -m pip install -U \
         SharedArray \
         # Flask \
         # paho-mqtt \
         # PyYAML \
         # matplotlib \
-        scipy \
     && echo "deb https://packages.cloud.google.com/apt coral-edgetpu-stable main" > /etc/apt/sources.list.d/coral-edgetpu.list \
     && wget -q -O - https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \
     && apt -qq update \