diff --git a/test/torchtext_unittest/datasets/test_cnndm.py b/test/torchtext_unittest/datasets/test_cnndm.py
index a2de23cc3c..c3b5561e36 100644
--- a/test/torchtext_unittest/datasets/test_cnndm.py
+++ b/test/torchtext_unittest/datasets/test_cnndm.py
@@ -87,8 +87,7 @@ def test_cnndm(self, split):
         dataset = CNNDM(root=self.root_dir, split=split)
         samples = list(dataset)
         expected_samples = self.samples[split]
-        for sample, expected_sample in zip_equal(samples, expected_samples):
-            self.assertEqual(sample, expected_sample)
+        self.assertEqual(expected_samples, samples)
 
     @parameterized.expand(["train", "val", "test"])
     @patch("torchtext.datasets.cnndm._get_split_list", _mock_split_list)
diff --git a/torchtext/datasets/cnndm.py b/torchtext/datasets/cnndm.py
index 3b5f6aa42b..db65680d17 100644
--- a/torchtext/datasets/cnndm.py
+++ b/torchtext/datasets/cnndm.py
@@ -1,8 +1,7 @@
 import hashlib
 import os
-from collections import defaultdict
 from functools import partial
-from typing import Union, Tuple
+from typing import Union, Set, Tuple
 
 from torchtext._internal.module_utils import is_module_available
 from torchtext.data.datasets_utils import (
@@ -52,8 +51,6 @@
     "test": 11490,
 }
 
-story_fnames = defaultdict(set)
-
 
 def _filepath_fn(root: str, source: str, _=None):
     return os.path.join(root, PATH_LIST[source])
@@ -61,19 +58,17 @@ def _filepath_fn(root: str, source: str, _=None):
 
 # called once per tar file, therefore no duplicate processing
 def _extracted_folder_fn(root: str, source: str, split: str, _=None):
-    global story_fnames
     key = source + "_" + split
-    story_fnames[key] = set(_get_split_list(source, split))
-    filepaths = [os.path.join(root, _EXTRACTED_FOLDERS[source], story) for story in story_fnames[key]]
-    return filepaths
+    filepath = os.path.join(root, key)
+    return filepath
 
 
 def _extracted_filepath_fn(root: str, source: str, x: str):
     return os.path.join(root, _EXTRACTED_FOLDERS[source], os.path.basename(x))
 
 
-def _filter_fn(source: str, split: str, x: tuple):
-    return os.path.basename(x[0]) in story_fnames[source + "_" + split]
+def _filter_fn(split_list: Set[str], x: tuple):
+    return os.path.basename(x[0]) in split_list
 
 
 def _hash_urls(s: tuple):
@@ -96,6 +91,7 @@ def _get_split_list(source: str, split: str):
 
 
 def _load_stories(root: str, source: str, split: str):
+    split_list = set(_get_split_list(source, split))
     story_dp = IterableWrapper([URL[source]])
     cache_compressed_dp = story_dp.on_disk_cache(
         filepath_fn=partial(_filepath_fn, root, source),
@@ -108,7 +104,7 @@ def _load_stories(root: str, source: str, split: str):
         filepath_fn=partial(_extracted_folder_fn, root, source, split)
     )
     cache_decompressed_dp = (
-        FileOpener(cache_decompressed_dp, mode="b").load_from_tar().filter(partial(_filter_fn, source, split))
+        FileOpener(cache_decompressed_dp, mode="b").load_from_tar().filter(partial(_filter_fn, split_list))
     )
     cache_decompressed_dp = cache_decompressed_dp.end_caching(
         mode="wb", filepath_fn=partial(_extracted_filepath_fn, root, source)
diff --git a/torchtext/datasets/imdb.py b/torchtext/datasets/imdb.py
index debb5c06f3..d9962342b4 100644
--- a/torchtext/datasets/imdb.py
+++ b/torchtext/datasets/imdb.py
@@ -32,7 +32,7 @@ def _filepath_fn(root, _=None):
 
 
 def _decompressed_filepath_fn(root, decompressed_folder, split, labels, _=None):
-    return [os.path.join(root, decompressed_folder, split, label) for label in labels]
+    return os.path.join(root, decompressed_folder, split)
 
 
 def _filter_fn(filter_imdb_data, split, t):
diff --git a/torchtext/datasets/iwslt2017.py b/torchtext/datasets/iwslt2017.py
index 5d51c75a62..1691e0c89c 100644
--- a/torchtext/datasets/iwslt2017.py
+++ b/torchtext/datasets/iwslt2017.py
@@ -240,7 +240,24 @@ def IWSLT2017(root=".data", split=("train", "valid", "test"), language_pair=("de
         filepath_fn=partial(_inner_iwslt_tar_filepath_fn, inner_iwslt_tar)
     )
     cache_decompressed_dp = cache_decompressed_dp.open_files(mode="b").load_from_tar()
-    cache_decompressed_dp = cache_decompressed_dp.end_caching(mode="wb", same_filepath_fn=True)
+    # As we had filenames duplicated, any trash files in archive can become tgz
+
+    def extracted_file_name(inner_iwslt_tar, inner_tar_name):
+        name = os.path.basename(inner_tar_name)
+        path = os.path.dirname(inner_iwslt_tar)
+        return os.path.join(path, name)
+
+    cache_decompressed_dp = cache_decompressed_dp.end_caching(
+        mode="wb", filepath_fn=partial(extracted_file_name, inner_iwslt_tar)
+    )
+    # As we corrected path, we need to leave tgz files only now and no dot files
+
+    def leave_only_tgz(file_name):
+        name = os.path.basename(file_name)
+        _, file_extension = os.path.splitext(file_name)
+        return file_extension == ".tgz" and name[0] != "."
+
+    cache_decompressed_dp = cache_decompressed_dp.filter(leave_only_tgz)
     cache_decompressed_dp_1, cache_decompressed_dp_2 = cache_decompressed_dp.fork(num_instances=2)
 
     src_filename = file_path_by_lang_and_split[src_language][split]