diff --git a/fastNLP/core/trainer.py b/fastNLP/core/trainer.py
index 5fa89e24..c9f16b9a 100644
--- a/fastNLP/core/trainer.py
+++ b/fastNLP/core/trainer.py
@@ -867,10 +867,6 @@ def _get_value_info(_dict):
     return strs
 
 
-from numbers import Number
-from .batch import _to_tensor
-
-
 def _check_code(dataset, model, losser, metrics, forward_func, batch_size=DEFAULT_CHECK_BATCH_SIZE,
                 dev_data=None, metric_key=None, check_level=0):
     # check get_loss 方法
diff --git a/fastNLP/io/utils.py b/fastNLP/io/utils.py
index 4a40b83a..c5dc7fd7 100644
--- a/fastNLP/io/utils.py
+++ b/fastNLP/io/utils.py
@@ -36,6 +36,7 @@ def check_loader_paths(paths: Union[str, Dict[str, str]]) -> Dict[str, str]:
             return {'train': paths}
         elif os.path.isdir(paths):
             filenames = os.listdir(paths)
+            filenames.sort()
             files = {}
             for filename in filenames:
                 path_pair = None
diff --git a/fastNLP/models/seq2seq_generator.py b/fastNLP/models/seq2seq_generator.py
index aa270b5f..81eb344d 100644
--- a/fastNLP/models/seq2seq_generator.py
+++ b/fastNLP/models/seq2seq_generator.py
@@ -1,3 +1,5 @@
+r"""undocumented"""
+
 import torch
 from torch import nn
 from .seq2seq_model import Seq2SeqModel
diff --git a/fastNLP/modules/decoder/seq2seq_decoder.py b/fastNLP/modules/decoder/seq2seq_decoder.py
index 987679b3..41f255b6 100644
--- a/fastNLP/modules/decoder/seq2seq_decoder.py
+++ b/fastNLP/modules/decoder/seq2seq_decoder.py
@@ -1,4 +1,4 @@
-
+r"""undocumented"""
 from typing import Union, Tuple
 import math
 
diff --git a/fastNLP/modules/encoder/seq2seq_encoder.py b/fastNLP/modules/encoder/seq2seq_encoder.py
index c38fa896..b35ca2d5 100644
--- a/fastNLP/modules/encoder/seq2seq_encoder.py
+++ b/fastNLP/modules/encoder/seq2seq_encoder.py
@@ -1,3 +1,4 @@
+r"""undocumented"""
 import torch.nn as nn
 import torch
 from torch.nn import LayerNorm
diff --git a/test/io/loader/test_classification_loader.py b/test/io/loader/test_classification_loader.py
index 72db136c..6ed8eb15 100644
--- a/test/io/loader/test_classification_loader.py
+++ b/test/io/loader/test_classification_loader.py
@@ -30,7 +30,7 @@ class TestLoad(unittest.TestCase):
             'imdb': ('test/data_for_tests/io/imdb', IMDBLoader, (6, 6, 6), False),
             'ChnSentiCorp': ('test/data_for_tests/io/ChnSentiCorp', ChnSentiCorpLoader, (6, 6, 6), False),
             'THUCNews': ('test/data_for_tests/io/THUCNews', THUCNewsLoader, (9, 9, 9), False),
-            'WeiboSenti100k': ('test/data_for_tests/io/WeiboSenti100k', WeiboSenti100kLoader, (6, 6, 7), False),
+            'WeiboSenti100k': ('test/data_for_tests/io/WeiboSenti100k', WeiboSenti100kLoader, (6, 7, 6), False),
         }
         for k, v in data_set_dict.items():
             path, loader, data_set, warns = v
diff --git a/test/io/loader/test_matching_loader.py b/test/io/loader/test_matching_loader.py
index d2b221c5..30ace410 100644
--- a/test/io/loader/test_matching_loader.py
+++ b/test/io/loader/test_matching_loader.py
@@ -31,8 +31,8 @@ class TestMatchingLoad(unittest.TestCase):
             'MNLI': ('test/data_for_tests/io/MNLI', MNLILoader, (5, 5, 5, 5, 6), True),
             'Quora': ('test/data_for_tests/io/Quora', QuoraLoader, (2, 2, 2), False),
             'BQCorpus': ('test/data_for_tests/io/BQCorpus', BQCorpusLoader, (5, 5, 5), False),
-            'XNLI': ('test/data_for_tests/io/XNLI', CNXNLILoader, (6, 8, 6), False),
-            'LCQMC': ('test/data_for_tests/io/LCQMC', LCQMCLoader, (6, 6, 5), False),
+            'XNLI': ('test/data_for_tests/io/XNLI', CNXNLILoader, (6, 6, 8), False),
+            'LCQMC': ('test/data_for_tests/io/LCQMC', LCQMCLoader, (6, 5, 6), False),
         }
         for k, v in data_set_dict.items():
             path, loader, instance, warns = v
diff --git a/test/io/pipe/test_matching.py b/test/io/pipe/test_matching.py
index ea687b2e..92993690 100644
--- a/test/io/pipe/test_matching.py
+++ b/test/io/pipe/test_matching.py
@@ -38,8 +38,8 @@ class TestRunMatchingPipe(unittest.TestCase):
             'QNLI': ('test/data_for_tests/io/QNLI', QNLIPipe, QNLIBertPipe, (5, 5, 5), (372, 2), True),
             'MNLI': ('test/data_for_tests/io/MNLI', MNLIPipe, MNLIBertPipe, (5, 5, 5, 5, 6), (459, 3), True),
             'BQCorpus': ('test/data_for_tests/io/BQCorpus', BQCorpusPipe, BQCorpusBertPipe, (5, 5, 5), (32, 2), False),
-            'XNLI': ('test/data_for_tests/io/XNLI', CNXNLIPipe, CNXNLIBertPipe, (6, 8, 6), (39, 3), False),
-            'LCQMC': ('test/data_for_tests/io/LCQMC', LCQMCPipe, LCQMCBertPipe, (6, 6, 5), (36, 2), False),
+            'XNLI': ('test/data_for_tests/io/XNLI', CNXNLIPipe, CNXNLIBertPipe, (6, 6, 8), (39, 3), False),
+            'LCQMC': ('test/data_for_tests/io/LCQMC', LCQMCPipe, LCQMCBertPipe, (6, 5, 6), (36, 2), False),
         }
         for k, v in data_set_dict.items():
             path, pipe1, pipe2, data_set, vocab, warns = v