Update Dockerfile

Dockerfile

@@ -30,6 +30,7 @@ RUN wget --quiet --no-check-certificate https://repo.continuum.io/miniconda/Mini
 # Install Python packages and keras
 ENV NB_USER keras
 ENV NB_UID 1000
+RUN mkdir /userdata/kerasData
 
 RUN useradd -m -s /bin/bash -N -u $NB_UID $NB_USER && \
     chown $NB_USER $CONDA_DIR -R && \