Epoch {epoch}: {metric} became undefined (NaN). The run diverged — the last usable reading was {value} at epoch {last_epoch}.
{metric} stopped being a number at epoch {epoch}. Training diverged; the last real value was {value} at epoch {last_epoch}.
The run diverged at epoch {epoch}: {metric} is no longer a number. Nothing after epoch {last_epoch} ({value}) can be read.
