tensorboardX is converting white/blank space and other non alphanumeric characters to underscore
Example:
writer.add_scalar("Episode / Total timesteps (mean)", -1500, 1)
generates Episode_/_Total_timesteps__mean_
instead of the expected tag as done using PyTorch
![Screenshot from 2023-04-30 15-44-05](https://user-images.githubusercontent.com/22400377/235356401-ac248806-07e4-454a-b189-d6d1233df3b4.png)