If you’re having an issue where TensorBoard isn’t working according to this guide:
https://dev.epicgames.com/community/learning/tutorials/Zen7/unreal-engine-setting-up-tensorboard
And it’s not generating the files that should be in this folder:
{YourProjectLocation}\Intermediate\LearningAgents\TensorBoard\runs
I found a solution. You need to install TensorBoard in this specific Python instance:
your_project\Intermediate\PipInstall\Scripts\python.exe
Because during training, Unreal Engine refers to this Python version.
(I couldn’t get the TensorBoard viewer session to run using this Python, so I also installed TensorBoard in the engine itself and launched it from there.)