ColossalAI/colossalai/context/process_group_initializer/initializer_1d.py

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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
import torch.distributed as dist
from colossalai.global_variables import tensor_parallel_env as env
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from colossalai.registry import DIST_GROUP_INITIALIZER
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from ..parallel_mode import ParallelMode
from .process_group_initializer import ProcessGroupInitializer
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@DIST_GROUP_INITIALIZER.register_module
class Initializer_1D(ProcessGroupInitializer):
'''A ProcessGroupInitializer for 1d tensor parallelism.
'''
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def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.num_group = self.world_size // self.tensor_parallel_size
def init_dist_group(self):
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"""Initialize 1D tensor parallel groups, and assign local_ranks and groups to each gpu.
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:return: (local_rank, group_world_size, process_group, ranks_in_group, mode)
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:rtype: Tuple
"""
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local_rank = None
ranks_in_group = None
process_group = None
group_world_size = None
mode = ParallelMode.PARALLEL_1D
env.parallel_input_1d = False
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for i in range(self.num_group):
ranks = [i * self.tensor_parallel_size + j for j in range(self.tensor_parallel_size)]
group = dist.new_group(ranks)
if self.rank in ranks:
local_rank = ranks.index(self.rank)
group_world_size = len(ranks)
process_group = group
ranks_in_group = ranks
return local_rank, group_world_size, process_group, ranks_in_group, mode