Replace #trials with `trial number`
See original GitHub issueMotivation
In a few visualisation methods, Optuna uses #Trials to represent trial id. For example, the colour bar on https://optuna.readthedocs.io/en/latest/reference/visualization/generated/optuna.visualization.plot_slice.html.
Personally, #Trials seems confusing. If the number of trials increases, I may misunderstand that #Trials indicates the duplicated parameter combination. Indeed, https://github.com/optuna/optuna/issues/2967 asks the meaning of #Trials.
Description
~I propose using trial id instead of #Trials in plot_slice, plot_pareto_front, and plot_optimization_history. But I’d like to know the users and dev-member opinions before creating the PR.~
I propose using Trial Number instead of #Trials in plot_slice, plot_pareto_front, and plot_optimization_history
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Additional context (optional)
Issue Analytics
- State:
- Created 2 years ago
- Comments:8 (4 by maintainers)

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Hi, seems like an easy fix! I would be happy to deal with this issue!
I think
#is commonly used as a number sign. https://en.wikipedia.org/wiki/Number_sign But it is OK to replace it with explicit form.I prefer
trial numbertotrial id. They are different conceptions.