Limiting intel-tensorflow version to 1.13.1 to re-enable CI; Updating nightly schedule to run on Saturdays as well

.circleci/config.yml

@@ -712,7 +712,7 @@ workflows:
   nightly:
     triggers:
       - schedule:
-          cron: "0 1 * * 0-5"
+          cron: "0 1 * * 0-6"
           filters:
             branches:
               only:

setup.py

@@ -68,7 +68,10 @@ if not using_GPU:
     if not slim_package:
         # For linux wth no GPU, we install the Intel optimized version of TensorFlow
         if sys.platform == "linux" or sys.platform == "linux2":
-            install_requires.append('intel-tensorflow>=1.9.0')
+            # CI: limiting version to 1.13.1 due to
+            # https://github.com/tensorflow/tensorflow/issues/29617
+            # (reproduced with intel-tensorflow 1.14.0 but not with 1.13.1)
+            install_requires.append('intel-tensorflow==1.13.1')
         else:
             install_requires.append('tensorflow>=1.9.0')
     extras['mxnet'] = ['mxnet-mkl>=1.3.0']