Train, halt, and resume

Start, stop, and continue training from the Arena UI. You do not need a separate HTTP client.

Train (start a draft)

Where:

  • Train on wizard Summary (tooltip: training begins when resources are ready, usually within about ten minutes).

  • Train in the Train column on the project Experiments tab.

When it works:

  • Experiments table: status Draft, Succeeded, or Stopped, plus a valid algorithm and environment or dataset (the row is runnable). Resource class is not required for the table button.

  • Wizard Summary: status Draft and a resource class selected (Train on Summary checks compute only).

  • Custom gym environments with a missing or invalid implementation keep Train disabled.

What happens:

  • Success toast: Experiment {name} scheduled for training. Training will begin shortly when resources are ready, usually within 10 minutes.

  • Status becomes Pending, then Running when the job starts.

  • Train from Summary returns you to the project Experiments tab.

Failure shows: Failed to schedule experiment: {error}

Halt (stop a run)

Where: Row menu (⋮) → Stop training on the Experiments or Results tab.

Dialog: Stop Experiment asks Are you sure you want to stop {name}? with Stop and Cancel.

When it works: Status is Running, Stopping, or Pending. Otherwise Stop training is disabled or not offered.

What happens:

  • Status moves to Stopping, then a terminal state such as Stopped or Failed.

  • Success toast: Experiment ‘{name}’ stopped.

Resume

Where:

  • Resume on Summary (for non-draft experiments that are not Running or Pending).

  • Resume in the Train column when the run finished or stopped and checkpoints exist.

Dialog: Resume Experiment

  • Select a checkpoint to resume training from: table with Select, Steps, Training Score, Evaluation Score (scores show N/A when missing).

  • Name for new experiment * (placeholder Enter experiment name).

  • If the experiment belongs to a pipeline, a warning explains that resuming triggers that pipeline stage.

What happens:

  • Same schedule success message as Train.

  • A new experiment row (or renamed run) picks up from the checkpoint you chose.

Resume is hidden for Draft, Running, and Pending.

Status reference

Typical flow: Pending → Running → Succeeded / Failed / Stopped, with Stopping after halt. Full list: Experiment statuses.