Why can't I sort or filter metrics with certain characters?

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Valid metric names

• Allowed characters: Letters (A-Z, a-z), digits (0-9), and underscores (_).
• Starting character: Names must start with a letter or underscore.
• Pattern: Metric names should match /^[_a-zA-Z][_a-zA-Z0-9]*$/.

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Examples

with wandb.init() as run:
  run.log({"accuracy": 0.9, "val_loss": 0.1, "epoch_5": 5})
  run.log({"modelAccuracy": 0.95, "learning_rate": 0.001})

with wandb.init() as run:
  run.log({"acc,val": 0.9})  # Contains comma
  run.log({"loss-train": 0.1})  # Contains hyphen
  run.log({"test acc": 0.95})  # Contains space
  run.log({"5_fold_cv": 0.8})  # Starts with number

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Recommended solution

• Instead of "test acc", use "test_acc".
• Instead of "loss-train", use "loss_train".
• Instead of "acc,val", use "acc_val".