diff --git a/torchnlp/encoders/text/__init__.py b/torchnlp/encoders/text/__init__.py
index 645314c..f220350 100755
--- a/torchnlp/encoders/text/__init__.py
+++ b/torchnlp/encoders/text/__init__.py
@@ -15,7 +15,7 @@
 from torchnlp.encoders.text.spacy_encoder import SpacyEncoder
 from torchnlp.encoders.text.static_tokenizer_encoder import StaticTokenizerEncoder
 from torchnlp.encoders.text.subword_encoder import SubwordEncoder
-from torchnlp.encoders.text.text_encoder import BatchedSequences
+from torchnlp.encoders.text.text_encoder import SequenceBatch
 from torchnlp.encoders.text.text_encoder import pad_tensor
 from torchnlp.encoders.text.text_encoder import stack_and_pad_tensors
 from torchnlp.encoders.text.text_encoder import TextEncoder
@@ -28,5 +28,5 @@
     'DEFAULT_RESERVED_TOKENS', 'DEFAULT_SOS_INDEX', 'DEFAULT_SOS_TOKEN', 'DEFAULT_UNKNOWN_INDEX',
     'DEFAULT_UNKNOWN_TOKEN', 'DelimiterEncoder', 'MosesEncoder', 'pad_tensor',
     'stack_and_pad_tensors', 'TextEncoder', 'SpacyEncoder', 'StaticTokenizerEncoder',
-    'SubwordEncoder', 'TreebankEncoder', 'WhitespaceEncoder', 'BatchedSequences'
+    'SubwordEncoder', 'TreebankEncoder', 'WhitespaceEncoder', 'SequenceBatch'
 ]
diff --git a/torchnlp/encoders/text/text_encoder.py b/torchnlp/encoders/text/text_encoder.py
index f06ec78..44fa6c6 100644
--- a/torchnlp/encoders/text/text_encoder.py
+++ b/torchnlp/encoders/text/text_encoder.py
@@ -1,4 +1,4 @@
-from collections import namedtuple
+import typing
 
 import torch
 
@@ -25,7 +25,9 @@ def pad_tensor(tensor, length, padding_index=DEFAULT_PADDING_INDEX):
     return torch.cat((tensor, padding), dim=0)
 
 
-BatchedSequences = namedtuple('BatchedSequences', ['tensor', 'lengths'])
+class SequenceBatch(typing.NamedTuple):
+    tensor: torch.Tensor
+    lengths: torch.Tensor
 
 
 def stack_and_pad_tensors(batch, padding_index=DEFAULT_PADDING_INDEX, dim=0):
@@ -37,8 +39,7 @@ def stack_and_pad_tensors(batch, padding_index=DEFAULT_PADDING_INDEX, dim=0):
         dim (int, optional): Dimension on to which to concatenate the batch of tensors.
 
     Returns
-        BatchedSequences(torch.Tensor, torch.Tensor): Padded tensors and original lengths of
-            tensors.
+        SequenceBatch: Padded tensors and original lengths of tensors.
     """
     lengths = [tensor.shape[0] for tensor in batch]
     max_len = max(lengths)
@@ -48,7 +49,7 @@ def stack_and_pad_tensors(batch, padding_index=DEFAULT_PADDING_INDEX, dim=0):
     for _ in range(dim):
         lengths = lengths.unsqueeze(0)
 
-    return BatchedSequences(padded, lengths)
+    return SequenceBatch(padded, lengths)
 
 
 class TextEncoder(Encoder):
diff --git a/torchnlp/utils.py b/torchnlp/utils.py
index 2b6c266..7b62137 100644
--- a/torchnlp/utils.py
+++ b/torchnlp/utils.py
@@ -7,10 +7,9 @@
 logger = logging.getLogger(__name__)
 
 
-def _get_tensors(object_, seen=set()):
+def _get_tensors(object_, seen=None):
     if torch.is_tensor(object_):
         return [object_]
-
     elif isinstance(object_, (str, float, int)) or id(object_) in seen:
         return []
 
@@ -42,7 +41,7 @@ def get_tensors(object_):
     Returns:
         (list of torch.tensor): List of tensors that are associated with ``object_``.
     """
-    return _get_tensors(object_)
+    return _get_tensors(object_, set())
 
 
 def sampler_to_iterator(dataset, sampler):