Environments side-by-side

Side-by-side is one of a run’s tabs, alongside Environments and Compare. It lays environments out in a grid: one column per environment and one row per metric, so each environment’s curves stay in their own column instead of overlaid on shared axes.

Like the other two, the tab only applies to reinforcement learning runs — it’s disabled on a run that logged no environments.

It’s the environment-level counterpart to Side-by-side for runs.

How it works

Selection works just like Compare environments: pick environments with the visibility control in the left list, and metrics in the middle tree. The right panel then fills a grid:

Columns are environments; their IDs stay pinned along the top as you scroll.
Rows are metrics; their names stay pinned down the left side.
The grid is virtualized, so it stays responsive with many environments and metrics.
Use the fullscreen toggle to expand the whole grid.

The RL Step / Episode toggle and slider sit in the toolbar and pin the point in time the grid is drawn for, the same as on Compare. The chart x-axis mode isn’t offered for the same reason — the pinned scale point determines the axis.

Each cell is an ordinary chart, so tooltips, zoom, highlighting, and export all work as usual, and Settings applies across the grid.

When to use it

Side-by-side — best when you want each environment’s curves kept separate and aligned so you can scan across a matrix, or when an overlay has become too crowded to read.
Compare — best when you want environments overlaid on the same axes to spot divergence directly.