Add Experience-Change Logging to WandBLogger

[HamedHemati]

This PR adds experience-change logging to the WandB logger by explicitly setting the step in wandb.log(.). This can be useful to have more meaningful visualizations in some of the plots.

Example:

is mapped to:

)

[coveralls]

Pull Request Test Coverage Report for Build 1676850052

• 3 of 16 (18.75%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 79.9%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
avalanche/logging/wandb_logger.py	3	16	18.75%

Totals
Change from base Build 1667756401:	-0.05%
Covered Lines:	11560
Relevant Lines:	14468

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💛 - Coveralls

[AndreaCossu]

Hi @HamedHemati ! I haven't tried your changes, yet. If I got this correctly, the user will be able to modify the x-axis interactively on W&B platform by either leaving it as default (minibatch ID) or by selecting experience ID, right?

[HamedHemati]

Hi @HamedHemati ! I haven't tried your changes, yet. If I got this correctly, the user will be able to modify the x-axis interactively on W&B platform by either leaving it as default (minibatch ID) or by selecting experience ID, right?

Hi @AndreaCossu. Yes exactly. By default, the x-axis in all plots remains as "step" (which is the mini-batch increments) but for plots based on streams (eg. acc/loss for test streams), you can change it to experience ID. I use this very often, so I thought it might be useful to be merged.

[AndreaCossu]

Great, thanks 😄 I think it can be useful, especially for long streams. Can you just change the name to TrainingExperience instead of Experience? In this way we avoid confusion with test experiences ID.

[HamedHemati]

Yea sure, done :)