paguro.Collection.to_torch(return_type: TorchExportType = 'tensor', *, label: str | Expr | Sequence[str | Expr] | None = None, features: str | Expr | Sequence[str | Expr] | None = None, dtype: PolarsDataType | None = None) → dict[str, torch.Tensor | dict[str, torch.Tensor] | PolarsDataset]