How to allow different conda environment inside jupyter notebook

allow_conda_env_in_jupyter_notebook

1. For example:
conda create --name tf
conda activate tf
conda install -c conda-forge tensorflow
2. It is good to have the conda tab in jupyter notebook:
conda install nb_conda
3. It is also good to update conda env. kernels automatically:
conda install nb_conda_kernels
4. You should have ipython kernel in the environment:
conda install ipykernel
5. Then install it in conda environment to appear in kernel list:
python -m ipykernel install --user --name tf