Enhance the execution speed of CPM dataloaders (#230)

* Update start_pytorch_task.py - Handle non-zero return code in process execution

feat: Handle non-zero return code in process execution

Refactor the code to check the return code of each process execution.
If the return code is non-zero, an exception is raised with a descriptive
error message indicating the process ID and suggesting to check the relevant
issue for further details.

* Enhance the execution speed of CPM dataloaders

Enhance the execution speed of CPM dataloaders, potentially reducing the time by around 30 seconds, subject to potential variations due to different environments 

Initialize jieba library using jieba.initialize()

training/benchmarks/cpm/pytorch/dataloaders/tokenization_gpt2.py

@@ -21,6 +21,11 @@
 import sentencepiece as spm
 import jieba
 
+try:
+    jieba.initialize()
+except Exception:
+    pass
+
 try:
     from functools import lru_cache
 except ImportError: