background heatmap range is limited by maximal value of current epoch, rather than maximum value over all epochs

[gfrogat]

not sure whether this is intended, but for me this is unexpected behaviour. In my opinion it would make more sense to scale the heatmaps by the maximum possible value or the maximum attained value over all epochs rather than per epoch.

In the screenshot below you can see that the scaling is completely off for the selected epoch. The actual values are very close but difference in the heatmap is very big.

[thinkh]

The range of the color scale should be [0,1] for relative values.