Make xlabel customizable about livelossplot HOT 4 CLOSED

@stared maybe we should add some metadata to metrics / groups - to notify plugins about metric-wise properties like step units?

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@vfdev-5 So, in general, I want to make plots more customizable.

I kind of procrastinate on that because there are a few possibilities:

• custom name for x-label
• custom function for plot labels, annotations, anything (so e.g. people can change also legend)
• whole custom function for a plot (the most general)

And on top of that, there is a long-overdue idea of switching to object-oriented API #16.

I like the idea of @Bartolo1024 to attach the x-label to groups (as plots are per group) - so one can combine per-batch and per-epoch plots.

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Either solution works for as far as it show correct plots with right axes :)

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With 0.5.2 it is customizable, vide https://github.com/stared/livelossplot/blob/master/examples/matplotlib.ipynb, thanks to @Bartolo1024.

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