How to initialize if using tf.Session to get a new session?

It's line `29` in file `tensorflow2.0/deep-sort-yolov4/yolo.py` .
```python3
self.sess = tf.compat.v1.keras.backend.get_session()
```
How to initialize the session if I change this line to:
```python3
self.sess = tf.Session()
```