code: def is_empty(self):
      return len(self._bucket) == 0
  
file_path: colossalai/colossalai/zero/low_level/bookkeeping/tensor_bucket.py
imports: from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
label_desc: Use image node_id 5 for calling the TensorBucket obj's underlying member method code with example usage: obj.is_empty() and returns: unknown