diff --git a/.github/workflows/gpu-ci.yml b/.github/workflows/gpu-ci.yml
index 7b02c043..9f22d96c 100644
--- a/.github/workflows/gpu-ci.yml
+++ b/.github/workflows/gpu-ci.yml
@@ -57,7 +57,7 @@ jobs:
         if: ${{ github.event_name == 'pull_request' }}
         shell: bash
         run: |
-          echo "HEAD_SHA=$(echo ${{ github.event.pull_request.head.sha }} | cut cut -c1-8)" >> ${GITHUB_ENV}
+          echo "HEAD_SHA=$(echo ${{ github.event.pull_request.head.sha }} | cut -c1-8)" >> ${GITHUB_ENV}
 
       - name: Setup Environment (Push)
         if: ${{ github.event_name == 'push' }}
diff --git a/crossfit/backend/cudf/array.py b/crossfit/backend/cudf/array.py
index 57350415..1c98cbda 100644
--- a/crossfit/backend/cudf/array.py
+++ b/crossfit/backend/cudf/array.py
@@ -29,7 +29,7 @@ def __init__(self):
         def concatenate(self, series_list, *, axis=None):
             return cudf.concat(series_list, axis=axis or 0)
 
-    np_backend_dispatch.register((cudf.Series, cudf.GenericIndex))(CudfBackend())
+    np_backend_dispatch.register((cudf.Series, cudf.Index))(CudfBackend())
 
 
 @conversion.dispatch_to_dlpack.register_lazy("cudf")
diff --git a/crossfit/backend/cudf/series.py b/crossfit/backend/cudf/series.py
index 9b2d0070..941c8910 100644
--- a/crossfit/backend/cudf/series.py
+++ b/crossfit/backend/cudf/series.py
@@ -30,7 +30,7 @@ def create_list_series_from_1d_or_2d_ar(ar, index):
         return RuntimeError(f"Unexpected input shape: {ar.shape}")
     data = as_column(ar.flatten())
     offset_col = as_column(cp.arange(start=0, stop=len(data) + 1, step=n_cols), dtype="int32")
-    mask_col = cp.full(shape=n_rows, fill_value=True)
+    mask_col = cp.full(shape=n_rows, fill_value=cp.bool_(True))
     mask = cudf._lib.transform.bools_to_mask(as_column(mask_col))
     lc = cudf.core.column.ListColumn(
         size=n_rows,
diff --git a/crossfit/backend/torch/hf/model.py b/crossfit/backend/torch/hf/model.py
index d48eaa80..93b39ea0 100644
--- a/crossfit/backend/torch/hf/model.py
+++ b/crossfit/backend/torch/hf/model.py
@@ -30,7 +30,7 @@
 class HFModel(Model):
     def __init__(self, path_or_name: str, max_mem_gb: int = 16, training=False):
         super().__init__(path_or_name, max_mem_gb)
-
+    
         if not training:
             with torch.no_grad():
                 self.fit_memory_estimate_curve()
@@ -129,7 +129,14 @@ def estimate_memory(self, max_num_tokens: int, batch_size: int) -> int:
         return predicted_memory[0] / 1024  # Convert from MB to GB
 
     def max_seq_length(self) -> int:
-        return self.load_cfg().max_position_embeddings
+        max_seq_length = self.load_tokenizer().model_max_length
+        # Gaurd against the HF bug
+        # which sets max_seq_length to max(int) for some models
+        if max_seq_length > 1e5:
+            max_seq_length = AutoConfig.from_pretrained(
+                self.model_name_or_path
+            ).max_position_embeddings
+        return max_seq_length
 
 
 class SentenceTransformerModel(HFModel):
diff --git a/crossfit/backend/torch/loader.py b/crossfit/backend/torch/loader.py
index 63c7ef79..444c57da 100644
--- a/crossfit/backend/torch/loader.py
+++ b/crossfit/backend/torch/loader.py
@@ -1,4 +1,4 @@
-# Copyright 2023 NVIDIA CORPORATION
+# Copyright 2023-2024 NVIDIA CORPORATION
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,7 +14,7 @@
 
 import warnings
 from itertools import islice
-from typing import Dict, overload
+from typing import Dict, overload, Optional
 
 import torch
 
@@ -35,7 +35,7 @@ def __init__(self, data: Dict[str, torch.Tensor], batch_size: int, progress_bar=
     def __init__(self, data: CrossFrame, batch_size: int, progress_bar=None):
         ...
 
-    def __init__(self, data, batch_size: int, progress_bar=None, max_seq_len=None):
+    def __init__(self, data, batch_size: int, progress_bar=None, max_seq_len=None, padding_side:str = "right"):
         self.data = CrossFrame(data).cast(torch.Tensor)
         self.tensor_dict = self.data.to_dict()
         self._batch_size = batch_size
@@ -44,6 +44,7 @@ def __init__(self, data, batch_size: int, progress_bar=None, max_seq_len=None):
         self._to_map = []
         self.progress_bar = progress_bar
         self.max_seq_len = max_seq_len
+        self.padding_side = padding_side
 
     def map(self, fn):
         self._to_map.append(fn)
@@ -65,8 +66,10 @@ def __next__(self):
 
         batch = {key: val[self.current_idx : end] for key, val in self.tensor_dict.items()}
         if self.max_seq_len is not None:
-            batch = {key: val[:, : self.max_seq_len] for key, val in batch.items()}
-
+            if self.padding_side == "right":
+                batch = {key: val[:, : self.max_seq_len] for key, val in batch.items()}
+            else:
+                batch = {key: val[:, -self.max_seq_len :] for key, val in batch.items()}
         self.current_idx += self.batch_size
 
         for fn in self._to_map:
@@ -96,15 +99,20 @@ def __init__(
         self.to_ignore = to_ignore or []
         self.to_ignore.append("seq_length")
         self.model = model
+        self.pad_token_id = self.model.load_tokenizer().pad_token_id
+        self.padding_side = self.model.load_tokenizer().padding_side
 
         frame = CrossFrame(data).cast(torch.Tensor)
-        seq_length = (frame[sort_key] != 0).sum(axis=1)
+        seq_length = (frame[sort_key] != self.pad_token_id).sum(axis=1)
         self.sorted_indices = seq_length.argsort(descending=True)
         frame = frame.apply(lambda x: x[self.sorted_indices])
         frame = frame.assign(seq_length=seq_length[self.sorted_indices])
 
         super().__init__(frame, initial_batch_size, progress_bar=progress_bar)
         self.splits = self._find_optimal_splits()
+        # TODO: Debug PRINTS
+        print(f"Padding side: {self.padding_side}")
+        print(f"Pad token id: {self.pad_token_id}")
 
     def sort_column(self, col):
         indices = convert_array(self.sorted_indices, type(col))
@@ -138,7 +146,10 @@ def __next__(self):
                     if key not in self.to_ignore
                 }
                 clip_len = min(max(_tokens[start], _tokens[end - 1]), self.model.max_seq_length())
-                batch = {key: val[:, :clip_len] for key, val in batch.items()}
+                if self.padding_side == "right":
+                    batch = {key: val[:, :clip_len] for key, val in batch.items()}
+                else:
+                    batch = {key: val[:, -clip_len:] for key, val in batch.items()}
 
                 for fn in self._to_map:
                     batch = fn(batch)
diff --git a/crossfit/backend/torch/op/base.py b/crossfit/backend/torch/op/base.py
index 28528f64..c83e985a 100644
--- a/crossfit/backend/torch/op/base.py
+++ b/crossfit/backend/torch/op/base.py
@@ -66,6 +66,7 @@ def call(self, data, partition_info=None):
             loader = InMemoryLoader(
                 data[["input_ids", "attention_mask"]],
                 batch_size=self.batch_size,
+                padding_side=self.model.load_tokenizer().padding_side,
                 progress_bar=self.create_progress_bar(len(data), partition_info),
                 max_seq_len=self.model.max_seq_length(),
             )
diff --git a/crossfit/op/tokenize.py b/crossfit/op/tokenize.py
index e4d659ef..b14613d7 100644
--- a/crossfit/op/tokenize.py
+++ b/crossfit/op/tokenize.py
@@ -1,4 +1,4 @@
-# Copyright 2023 NVIDIA CORPORATION
+# Copyright 2023-2024 NVIDIA CORPORATION
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@
 class TokenizerType(Enum):
     SUBWORD = 1
     SENTENCE_PIECE = 2
+    DEFAULT = 3
 
 
 class Tokenizer(Op):
@@ -55,8 +56,10 @@ def __init__(
             GPUTokenizer.from_pretrained(self.model)
 
     def tokenize_strings(self, sentences, max_length=None):
-        if self.tokenizer_type == TokenizerType.SENTENCE_PIECE:
+        if self.tokenizer_type in [TokenizerType.SENTENCE_PIECE, TokenizerType.DEFAULT]:
             tokenizer = self.model.load_tokenizer()
+            self.padding_side = tokenizer.padding_side
+            self.pad_token_id = tokenizer.pad_token_id
 
             if isinstance(sentences, cudf.Series):
                 sentences = sentences.to_arrow().to_pylist()
@@ -81,6 +84,8 @@ def tokenize_strings(self, sentences, max_length=None):
                 tokenizer = GPUTokenizer.from_pretrained(self.model)
                 worker.tokenizer = tokenizer
 
+            self.padding_side = tokenizer.padding_side
+            self.pad_token_id = tokenizer.pad_token_id
             return worker.tokenizer(
                 sentences,
                 max_length=max_length or self.max_length,
@@ -110,7 +115,11 @@ def call_column(self, data):
             text = text.str.slice(0, self.max_chars)
 
         tokenized_data = self.tokenize_strings(text).copy()
-        tokenized_data = clip_tokens(tokenized_data, max_length=self.max_length, return_type="cp")
+        tokenized_data = clip_tokens(tokenized_data,
+                                     max_length=self.max_length,
+                                     padding_side=self.padding_side,
+                                     pad_token_id=self.pad_token_id,
+                                     return_type="cp")
 
         input_ids = create_list_series_from_1d_or_2d_ar(
             tokenized_data["input_ids"].astype("int32"), data.index
@@ -173,6 +182,8 @@ def _convert_to_tokenizer_type(
             tokenizer_type = TokenizerType.SENTENCE_PIECE
         elif tokenizer_type in ["subword", "bert", TokenizerType.SUBWORD]:
             tokenizer_type = TokenizerType.SUBWORD
+        elif tokenizer_type in ["default", TokenizerType.DEFAULT]:
+            tokenizer_type = TokenizerType.DEFAULT
         return tokenizer_type
 
 
@@ -180,6 +191,13 @@ class GPUTokenizer(SubwordTokenizer):
     def __init__(self, hash_file: str, do_lower_case: bool = True, config=None):
         super().__init__(str(hash_file), do_lower_case=do_lower_case)
         self.config = config or {"_name_or_path": hash_file}
+        self.padding_side = self.config.get("padding_side", "right")
+        self.pad_token_id = self.config.get("pad_token_id", 0)
+        if self.padding_side!="right":
+            raise ValueError(f"Only right padding is supported for GPUTokenizer, got {self.padding_side}")
+        if self.pad_token_id!=0:
+            raise ValueError(f"Only pad_token_id=0 is supported for GPUTokenizer, got {self.pad_token_id}")
+
 
     @classmethod
     def get_tokenizer_config(cls, name):
@@ -224,17 +242,26 @@ def from_pretrained(cls, name, cache_dir=None):
         return cls(hashed_vocab_path, config=config)
 
 
-def clip_tokens(token_o, max_length, return_type="pt"):
+def clip_tokens(token_o, max_length, padding_side, pad_token_id, return_type="pt"):
     if not isinstance(token_o["input_ids"], cp.ndarray):
         token_o = {k: cp.asarray(v) for k, v in token_o.items()}
 
-    clip_len = max_length - int((token_o["input_ids"][:, ::-1] != 0).argmax(1).min())
-    token_o["input_ids"] = _cast_to_appropriate_type(
-        token_o["input_ids"][:, :clip_len], return_type
-    )
-    token_o["attention_mask"] = _cast_to_appropriate_type(
-        token_o["attention_mask"][:, :clip_len], return_type
-    )
+    clip_len = max_length - int((token_o["input_ids"][:, ::-1] != pad_token_id).argmax(1).min())
+
+    if padding_side == "right":
+        token_o["input_ids"] = _cast_to_appropriate_type(
+            token_o["input_ids"][:, :clip_len], return_type
+        )
+        token_o["attention_mask"] = _cast_to_appropriate_type(
+            token_o["attention_mask"][:, :clip_len], return_type
+        )
+    else:
+        token_o["input_ids"] = _cast_to_appropriate_type(
+            token_o["input_ids"][:, -clip_len:], return_type
+        )
+        token_o["attention_mask"] = _cast_to_appropriate_type(
+            token_o["attention_mask"][:, -clip_len:], return_type
+        )
 
     if "metadata" in token_o:
         del token_o["metadata"]
diff --git a/tests/op/test_tokenize.py b/tests/op/test_tokenize.py
index bc79bc2f..6b01494f 100644
--- a/tests/op/test_tokenize.py
+++ b/tests/op/test_tokenize.py
@@ -44,3 +44,19 @@ def test_tokenizer_max_chars(model_name="sentence-transformers/all-MiniLM-L6-v2"
 
     assert results1["input_ids"][0] == results2["input_ids"][0]
     assert results1["input_ids"][1] == results2["input_ids"][1]
+
+
+def test_tokenizer_padded(model_name="microsoft/deberta-v3-base"):
+    model = cf.HFModel(model_name)
+    tokenizer = op.Tokenizer(model, cols=["text"], tokenizer_type="spm")
+    ddf = dask_cudf.from_cudf(
+        cudf.DataFrame({"text": ["hello world", "this is a sentence"]}),
+        npartitions=2,
+    )
+    results = tokenizer(ddf)
+    results = results.compute()
+
+    hf_tokenizer = transformers.AutoTokenizer.from_pretrained(model_name)
+    assert isinstance(results, cudf.DataFrame)
+    assert results["input_ids"][0] == hf_tokenizer(["hello world"])["input_ids"][0]
+    assert results["input_ids"][1] == hf_tokenizer(["this is a sentence"])["input_ids"][0]