Peg pip version to 19.3.1

test/ci/buildkite/ngtf-cpu_centos-grappler.yaml

@@ -56,6 +56,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_centos.yaml

@@ -55,6 +55,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_macos.yaml

@@ -39,7 +39,7 @@
       source /usr/local/var/buildkite-agent/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install -U \
         /usr/local/var/buildkite-agent/tf_1.14.0_install/artifacts/tensorflow/tensorflow-1.14.0-cp37-cp37m-macosx_10_7_x86_64.whl
-      pip install psutil && \
+      pip install psutil pip==19.3.1 && \
         pip install -U /usr/local/var/buildkite-agent/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_model-test.yaml

@@ -26,6 +26,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_ubuntu-bin-build.yaml

@@ -38,6 +38,7 @@
   - command: |
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil 
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
       PYTHONPATH=`pwd` python3 test/ci/buildkite/test_runner.py \
         --artifacts /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID --test_resnet

test/ci/buildkite/ngtf-cpu_ubuntu-external-fork.yaml

@@ -68,6 +68,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_ubuntu-variables.yaml

@@ -54,6 +54,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_ubuntu.yaml

@@ -68,6 +68,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-cpu_ubuntu_18_04.yaml

@@ -63,6 +63,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp36-cp36m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

test/ci/buildkite/ngtf-gpu_ubuntu.yaml

@@ -42,6 +42,7 @@
       source /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/venv/bin/activate 
       pip install psutil && pip install -U \
         /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/tensorflow/tensorflow-1.14.0-cp??-cp??m-linux_x86_64.whl
+      pip install -U pip==19.3.1
       pip install -U /localdisk/buildkite/artifacts/$BUILDKITE_BUILD_ID/ngraph_tensorflow_bridge-*.whl
 
     label: ":gear: Install"

tools/build_utils.py

@@ -148,7 +148,7 @@ def setup_venv(venv_dir):
         "pip",
         "install",
         "-U",
-        "pip",
+        "pip==19.3.1",
         "setuptools",
         "psutil",
         "six>=1.10.0",