docstr: Returns a bool indicating whether this instance is enabled.
code: def is_enabled(self):
      r"""
      Returns a bool indicating whether this instance is enabled.
      """
      return self._enabled
  
imports: import warnings
  from collections import abc, defaultdict
  from enum import Enum
  from typing import Any, Dict, List, Optional, Tuple
  import torch
  import torch.distributed
  from packaging import version
  from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
  from colossalai.legacy.context import ParallelMode
  from colossalai.legacy.core import global_context
label_desc: Use image node_id 19 for calling the GradScaler obj's underlying member method code with example usage: obj.is_enabled() and returns: self