I am trying to add 1 new class to existing 20 classes of VOC dataset. I am new to tensorflow and following this tutorial: TensorFlow Object Detection API tutorial — TensorFlow Object Detection API tutorial documentation 3. Unfortunately total loss never was less than around 10 and after 30000 steps it started increasing. I also tried to train with 20 original classes but result was the same.
log is here:  https://paste2.org/Ax8jZFLO 3
My setup:

AMD Radeon RX570 GPU
Windows 10
DirectML
Tensorflow 1.15
TensorFlow Model v.1.13.0

Any help will be highly appreciated.