[GitLabCI] Add numpy dependancy for unittest.

.gitlab/ci/build.gitlab-ci.yml

@@ -27,6 +27,8 @@ build:ubuntu_python:
     - python3 -m pip install virtualenv
     - virtualenv venv
     - source venv/bin/activate
+    # Numpy dependancy for unit test
+    - python3 -m pip install numpy
     - export AIDGE_INSTALL=`pwd`/install
     - python3 -m pip install .
   artifacts: