mv test_data_collator.py to test/data (#4843)

* mv test_data_collator.py to test/data

* set proper seed 3 for paddle.bernoulli

* remove unused comments

Author: w5688414

tests/trainer/test_data_collator.py renamed to tests/data/test_data_collator.py

@@ -215,7 +215,7 @@ def _test_no_pad_and_pad(self, no_pad_features, pad_features):
             # Expect error due to padding token missing
             data_collator(pad_features)
 
-        set_seed(42)  # For reproducibility
+        set_seed(3)  # For reproducibility
         tokenizer = BertTokenizer(self.vocab_file)
         data_collator = DataCollatorForLanguageModeling(tokenizer)
         batch = data_collator(no_pad_features)