add needed helper functions

Signed-off-by: Abhinav Khattar <aklife97@gmail.com>

megatron/core/parallel_state.py

@@ -233,6 +233,11 @@ def initialize_model_parallel(
     _set_global_memory_buffer()
 
 
+def is_unitialized():
+    """Useful for code segments that may be accessed with or without mpu initialization"""
+    return _DATA_PARALLEL_GROUP is None
+
+
 def model_parallel_is_initialized():
     """Check if model and data parallel groups are initialized."""
     if _TENSOR_MODEL_PARALLEL_GROUP is None or \
@@ -454,6 +459,12 @@ def get_virtual_pipeline_model_parallel_world_size():
     return _VIRTUAL_PIPELINE_MODEL_PARALLEL_WORLD_SIZE
 
 
+def set_virtual_pipeline_model_parallel_world_size(world_size):
+    """Set the virtual pipeline-parallel world size"""
+    global _VIRTUAL_PIPELINE_MODEL_PARALLEL_WORLD_SIZE
+    _VIRTUAL_PIPELINE_MODEL_PARALLEL_WORLD_SIZE = world_size
+
+
 def get_tensor_model_parallel_src_rank():
     """Calculate the global rank corresponding to the first local rank
     in the tensor model parallel group."""