Situation:
I have trained own model with google colab (tensorflow 1.15). it works good.
Trying to prepare pbtxt file for opencv with this tutorial https://github.com/opencv/opencv/wiki/TensorFlow-Object-Detection-API
Recieve file which is only 24Kb (last worked file prepared at June was 124Kb).
This pbtxt file with frozen model raise mistake (core dumped).
I have test saved previous own frozen graph model prepared before and generate good worked pbtxt file.
That means problem is in new tf 1.15 or with colab environments probably... somebody have this mistakes?

name of nodes is different in last and new pbtxt files.