update to spark 2.4.5

Author: Lee Yang

scripts/travis_before_install.sh

@@ -10,10 +10,10 @@ sudo apt-get install -y openjdk-8-jdk --no-install-recommends
 sudo update-java-alternatives -s java-1.8.0-openjdk-amd64
 
 # Download and install Spark
-curl -LO http://www-us.apache.org/dist/spark/spark-2.4.4/spark-2.4.4-bin-hadoop2.7.tgz
+curl -LO http://www-us.apache.org/dist/spark/spark-2.4.5/spark-2.4.5-bin-hadoop2.7.tgz
 export SPARK_HOME=./spark
 mkdir $SPARK_HOME
-tar -xf spark-2.4.4-bin-hadoop2.7.tgz -C $SPARK_HOME --strip-components=1
+tar -xf spark-2.4.5-bin-hadoop2.7.tgz -C $SPARK_HOME --strip-components=1
 export SPARK_LOCAL_IP=127.0.0.1
 export SPARK_CLASSPATH=./lib/tensorflow-hadoop-1.0-SNAPSHOT.jar
 export PATH=$SPARK_HOME/bin:$PATH