I installed tensorflow using this link: https://docs.nvidia.com/deeplearning/frameworks/install-tf-jetson-platform/index.html
It was successful.
I installed keras using
sudo pip3 install keras. It succeeded.
I installed opencv using this guide: Install OpenCV 3.2.0 with Jetpack 4.2.2 and How to install opencv-python for python3.6. It installs successfully.
BUT I am unable to import them in my Python Code. If I check
help('modules'). None of installed packages are showing.