class_docstr: Gather the input from model parallel region and concatinate.
class_docstr_tok: ["Gather","the","input","from","model","parallel","region","and","concatinate","."]
code: def forward(ctx, input_):
      return _gather_along_last_dim(input_)
  
imports: import torch
  from megatron.core.parallel_state import get_tensor_and_expert_parallel_group, get_tensor_model_parallel_group, get_tensor_model_parallel_rank, get_tensor_model_parallel_world_size
  from .utils import split_tensor_along_last_dim
label_desc: Use image node_id 2 for calling the _GatherFromModelParallelRegion obj's underlying member method code with example usage: obj.forward(ctx, input_) and returns: _gather_along_last_dim