mirror of https://github.com/hpcaitech/ColossalAI
531 lines
24 KiB
Python
531 lines
24 KiB
Python
import math
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from copy import deepcopy
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from dataclasses import dataclass
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from typing import Dict, List, Tuple
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import torch
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from colossalai.context.singleton_meta import SingletonMeta
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from colossalai.tensor.sharding_spec import ShardingSpec, ShardingSpecException
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from colossalai.tensor.utils import all_gather_simulator, all_to_all_simulator, shard_simulator
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from .comm_spec import *
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__all__ = ['ShapeConsistencyManager', 'ShapeConsistencyOptions', 'set_shape_consistency_options']
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@dataclass
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class ShapeConsistencyOptions:
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"""
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ShapeConsistencyOptions is a dataclass which specifies the preferences for shape consistency.
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"""
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# TODO: shape consistency option is not implemented yet
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pass
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def to_global(distributed_tensor: torch.Tensor, sharding_spec: ShardingSpec) -> torch.Tensor:
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shape_consistency_manager = ShapeConsistencyManager()
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global_sharding_spec = ShardingSpec(sharding_spec.device_mesh, sharding_spec.entire_shape, {})
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with torch.no_grad():
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global_tensor = shape_consistency_manager.apply_for_autoparallel_runtime(distributed_tensor, sharding_spec,
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global_sharding_spec)
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return global_tensor
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def set_shape_consistency_options(options: ShapeConsistencyOptions):
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"""
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Configure the shape consistency manager via function call.
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"""
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manager = ShapeConsistencyManager()
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manager.options = options
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class ShapeConsistencyManager(metaclass=SingletonMeta):
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def __init__(self):
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self._options = None
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self._forward_only = False
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self.total_communication_cost = 0
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self.total_transform_steps = 0
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self.cached_spec_pairs_transform_path = {}
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@property
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def options(self):
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return self._options
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@options.setter
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def options(self, options_: ShapeConsistencyOptions):
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assert isinstance(options_, ShapeConsistencyOptions)
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self._options = options_
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@property
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def forward_only(self):
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return self._forward_only
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@forward_only.setter
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def forward_only(self, value):
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assert isinstance(value, bool)
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self._forward_only = value
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def get_all_all_gather_spec(self, source_spec: ShardingSpec,
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orig_cost_dict: Dict[str, float]) -> Dict[ShardingSpec, float]:
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'''
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Get all valid sharding specs from source_spec with single all-gather operation, and
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accumulate commucation cost on origin cost which will finally be used in auto sharding solver.
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For the all-gather operation, we just care about the S dimension.
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Argument:
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source_spec(ShardingSpec): the ShardingSpec of the source_spec.
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orig_cost(Dict[str, float]): the original communication cost before this operation.
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Return:
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valid_spec_dict(Dict[ShardingSpec, float]): all valid sharding specs from source_spec with single all-gather operation.
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Example:
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dim_partition_dict = {0: [0], 1: [1]}
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# DistSpec:
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# shard_sequence: S0,S1,R
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# device_mesh_shape: (4, 4)
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sharding_spec = ShardingSpec(device_mesh, entire_shape, dim_partition_dict)
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shape_consistency_manager = ShapeConsistencyManager()
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rst_dict = shape_consistency_manager.get_all_all_gather_spec(sharding_spec, {'forward': 0, 'backward': 0, 'total': 0})
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print(rst_dict)
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Output:
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{DistSpec:
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shard_sequence: R,S1,R
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device_mesh_shape: (4, 4): 0, DistSpec:
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shard_sequence: S0,R,R
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device_mesh_shape: (4, 4): 0}
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'''
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valid_spec_dict = {}
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comm_pattern = CollectiveCommPattern.GATHER_FWD_SPLIT_BWD
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for target_pair in source_spec.dim_partition_dict.items():
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shard_list = all_gather_simulator(target_pair)
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index = target_pair[0]
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new_dim_partition_dict = deepcopy(source_spec.dim_partition_dict)
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# We won't add empty list into dim_partition_dict
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# The key will be popped if the related shard_list is empty
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if shard_list:
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new_dim_partition_dict[index] = shard_list
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else:
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new_dim_partition_dict.pop(index)
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# generate the CommSpec to record the action of source_sharding_spec->new_sharding_spec
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gather_dim = index
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logical_process_axis = target_pair[1][-1]
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comm_spec = CommSpec(
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comm_pattern,
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sharding_spec=source_spec,
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gather_dim=gather_dim,
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# shard_dim will be used during backward
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shard_dim=gather_dim,
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logical_process_axis=logical_process_axis,
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forward_only=self.forward_only)
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# compute the communication cost with CommSpec
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cost_dict = comm_spec.get_comm_cost()
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# generate new sharding spec
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try:
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new_sharding_spec = ShardingSpec(source_spec.device_mesh,
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source_spec.entire_shape,
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dim_partition_dict=new_dim_partition_dict)
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for phase, cost in cost_dict.items():
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cost_dict[phase] = cost + orig_cost_dict[phase]
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valid_spec_dict[new_sharding_spec] = (comm_spec, cost_dict)
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except ShardingSpecException:
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pass
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return valid_spec_dict
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def get_all_all_to_all_spec(self, source_spec: ShardingSpec,
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orig_cost_dict: Dict[str, float]) -> Dict[ShardingSpec, float]:
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'''
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Get all valid sharding specs from source_spec with single all-to-all operation, and
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accumulate commucation cost on origin cost which will finally be used in auto sharding solver.
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For the all-to-all operation, we just care about the pairs containing S dimension.
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Argument:
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source_spec(ShardingSpec): the ShardingSpec of the source_spec.
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orig_cost(Dict[str, float]): the original communication cost before this operation.
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Return:
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valid_spec_dict(Dict[ShardingSpec, float]): all valid sharding specs from source_spec with single all-to-all operation.
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Example:
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dim_partition_dict = {0: [0], 1: [1]}
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# DistSpec:
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# shard_sequence: S0,S1,R
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# device_mesh_shape: (4, 4)
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sharding_spec = ShardingSpec(device_mesh, entire_shape, dim_partition_dict)
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shape_consistency_manager = ShapeConsistencyManager()
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rst_dict = shape_consistency_manager.get_all_all_to_all_spec(sharding_spec, {'forward': 0, 'backward': 0, 'total': 0})
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print(rst_dict)
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Output:
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{DistSpec:
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shard_sequence: S01,R,R
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device_mesh_shape: (4, 4): 0, DistSpec:
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shard_sequence: R,S1,S0
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device_mesh_shape: (4, 4): 0, DistSpec:
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shard_sequence: S0,R,S1
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device_mesh_shape: (4, 4): 0}
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'''
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valid_spec_dict = {}
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comm_pattern = CollectiveCommPattern.ALL2ALL_FWD_ALL2ALL_BWD
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tensor_dims = len(source_spec.entire_shape)
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for f_index in range(tensor_dims - 1):
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for b_index in range(f_index + 1, tensor_dims):
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# skip (R, R) cases
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if f_index not in source_spec.dim_partition_dict and b_index not in source_spec.dim_partition_dict:
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continue
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else:
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if f_index in source_spec.dim_partition_dict:
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# skip (S01, R) -> (R, S01) is NOT allowed
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if len(source_spec.dim_partition_dict[f_index]) >= 2:
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continue
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f_target_pair = (f_index, deepcopy(source_spec.dim_partition_dict[f_index]))
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else:
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f_target_pair = (f_index, [])
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if b_index in source_spec.dim_partition_dict:
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# skip (R, S01) -> (S01, R) is NOT allowed
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if len(source_spec.dim_partition_dict[b_index]) >= 2:
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continue
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b_target_pair = (b_index, deepcopy(source_spec.dim_partition_dict[b_index]))
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else:
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b_target_pair = (b_index, [])
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# skip (S1, S0) -> S10
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if f_target_pair[1] and b_target_pair[1] and f_target_pair[1][0] >= b_target_pair[1][0]:
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continue
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f_shard_list, b_shard_list = all_to_all_simulator(f_target_pair, b_target_pair)
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f_index = f_target_pair[0]
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b_index = b_target_pair[0]
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# generate the CommSpec to record the action of source_sharding_spec->new_sharding_spec
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if len(f_shard_list) < len(f_target_pair[1]):
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gather_dim = f_index
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shard_dim = b_index
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logical_process_axis = f_target_pair[1][-1]
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else:
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gather_dim = b_index
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shard_dim = f_index
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logical_process_axis = b_target_pair[1][-1]
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comm_spec = CommSpec(comm_pattern,
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sharding_spec=source_spec,
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gather_dim=gather_dim,
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shard_dim=shard_dim,
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logical_process_axis=logical_process_axis,
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forward_only=self.forward_only)
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# compute the communication cost with CommSpec
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cost_dict = comm_spec.get_comm_cost()
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new_dim_partition_dict = deepcopy(source_spec.dim_partition_dict)
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# We won't add empty list into dim_partition_dict
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# The key will be popped if the related shard_list is empty
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if f_shard_list:
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new_dim_partition_dict[f_index] = f_shard_list
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else:
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new_dim_partition_dict.pop(f_index)
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if b_shard_list:
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new_dim_partition_dict[b_index] = b_shard_list
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else:
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new_dim_partition_dict.pop(b_index)
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# generate new sharding spec
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try:
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new_sharding_spec = ShardingSpec(source_spec.device_mesh,
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source_spec.entire_shape,
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dim_partition_dict=new_dim_partition_dict)
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for phase, cost in cost_dict.items():
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cost_dict[phase] = cost + orig_cost_dict[phase]
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valid_spec_dict[new_sharding_spec] = (comm_spec, cost_dict)
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except ShardingSpecException:
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pass
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return valid_spec_dict
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def get_all_shard_spec(self, source_spec: ShardingSpec, orig_cost_dict):
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'''
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Get all valid sharding specs from source_spec with single shard operation, and
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accumulate commucation cost on origin cost which will finally be used in auto sharding solver.
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For the sharding operation, we just care about legal sharding dimensions.
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Argument:
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source_spec(ShardingSpec): the ShardingSpec of the source_spec.
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orig_cost(float): the original communication cost before this operation.
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Return:
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valid_spec_dict(Dict[ShardingSpec, float]): all valid sharding specs from source_spec with single all-to-all operation.
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Example:
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dim_partition_dict = {0: [0]}
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# DistSpec:
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# shard_sequence: S0,R,R
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# device_mesh_shape: (4, 4)
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sharding_spec = ShardingSpec(device_mesh, entire_shape, dim_partition_dict)
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shape_consistency_manager = ShapeConsistencyManager()
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rst_dict = shape_consistency_manager.get_all_shard_spec(sharding_spec, {'forward': 0, 'backward': 0, 'total': 0})
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print(rst_dict)
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Output:
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{DistSpec:
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shard_sequence: S01,R,R
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device_mesh_shape: (4, 4): 0, DistSpec:
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shard_sequence: S0,S1,R
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device_mesh_shape: (4, 4): 0, DistSpec:
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shard_sequence: S0,R,S1
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device_mesh_shape: (4, 4): 0}
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'''
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valid_spec_dict = {}
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comm_pattern = CollectiveCommPattern.SPLIT_FWD_GATHER_BWD
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# legal sharding dims means the mesh_id is still available to use.
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legal_sharding_dims = [i for i in range(len(source_spec.device_mesh.mesh_shape))]
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for dim, shard_list in source_spec.dim_partition_dict.items():
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for element in shard_list:
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legal_sharding_dims.remove(element)
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if len(legal_sharding_dims) == 0:
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return valid_spec_dict
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tensor_dims = len(source_spec.entire_shape)
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for index in range(tensor_dims):
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if index not in source_spec.dim_partition_dict:
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shard_list_list = shard_simulator((index, []), legal_sharding_dims)
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else:
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shard_list_list = shard_simulator((index, source_spec.dim_partition_dict[index]), legal_sharding_dims)
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if not shard_list_list:
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continue
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for shard_list in shard_list_list:
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new_dim_partition_dict = deepcopy(source_spec.dim_partition_dict)
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new_dim_partition_dict[index] = shard_list
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# generate the CommSpec to record the action of source_sharding_spec->new_sharding_spec
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shard_dim = index
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logical_process_axis = shard_list[-1]
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comm_spec = CommSpec(comm_pattern,
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sharding_spec=source_spec,
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gather_dim=shard_dim,
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shard_dim=shard_dim,
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logical_process_axis=logical_process_axis,
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forward_only=self.forward_only)
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# compute the communication cost with CommSpec
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cost_dict = comm_spec.get_comm_cost()
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# generate new sharding spec
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try:
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new_sharding_spec = ShardingSpec(source_spec.device_mesh,
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source_spec.entire_shape,
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dim_partition_dict=new_dim_partition_dict)
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for phase, cost in cost_dict.items():
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cost_dict[phase] = cost + orig_cost_dict[phase]
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valid_spec_dict[new_sharding_spec] = (comm_spec, cost_dict)
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except ShardingSpecException:
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pass
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return valid_spec_dict
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def get_all_one_step_transform_spec(self, source_spec: ShardingSpec, orig_cost_dict) -> Dict[ShardingSpec, float]:
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'''
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Get all valid sharding specs from source_spec with one step transform, and
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accumulate commucation cost on origin cost which will finally be used in auto sharding solver.
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Note:
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all-gather will eliminate a sharding dimension, all-to-all will keep sharding dimension same as before,
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and shard will add a sharding dimension. Therefore, the result of above operations are mutual exclusive,
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we could safely put them together.
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Argument:
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source_spec(ShardingSpec): the ShardingSpec of the source_spec.
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orig_cost(float): the original communication cost before this operation.
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Return:
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valid_spec_dict(Dict[ShardingSpec, float]): all valid sharding specs from source_spec with single all-to-all operation.
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'''
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valid_spec_dict = {}
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valid_spec_dict.update(self.get_all_all_gather_spec(source_spec, orig_cost_dict))
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valid_spec_dict.update(self.get_all_all_to_all_spec(source_spec, orig_cost_dict))
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valid_spec_dict.update(self.get_all_shard_spec(source_spec, orig_cost_dict))
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return valid_spec_dict
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def shape_consistency(self, source_spec: ShardingSpec,
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target_spec: ShardingSpec) -> Tuple[List[ShardingSpec], List[CommSpec], float]:
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'''
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This method will find a path to transform source_spec to target_spec with
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a greedy algorithm.
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The basic idea is:
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Step1:
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Generate all one-step transform sequences from source_spec.
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Step2:
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Pick the 'best' sharding spec following the heuristic function.
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Step3:
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Repeat above steps until the source spec transform to target spec.
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During finding the transform path, commucation cost will be accumulated, and it
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will be finally used in auto parallel solver.
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Additionally, to avoid repeating the path search in runtime, we cached all solved path
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in auto parallel strategy building time, which could handle most of cases in runtime.
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Argument:
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source_spec(ShardingSpec): ShardingSpec of the source activation.
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target_spec(ShardingSpec): ShardingSpec of the target activation.
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Return:
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transform_path(List[ShardingSpec]): The transform path from source_spec to target_spec,
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it contains the source_spec and target_spec.
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comm_action_sequence(List[CommSpec]): Keep the communication operations to complete the shape consistency in order.
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total_cost(float): total cost to complete shape consistency transform.
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Example:
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dim_partition_source = {1: [0, 1]}
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dim_partition_target = {0: [0, 1]}
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# DistSpec:
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# shard_sequence: R,S01,R
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# device_mesh_shape: (4, 4)
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sharding_spec_source = ShardingSpec(device_mesh, entire_shape, dim_partition_source)
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# DistSpec:
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# shard_sequence: S01,R,R
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# device_mesh_shape: (4, 4)
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sharding_spec_target = ShardingSpec(device_mesh, entire_shape, dim_partition_target)
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transform_path, comm_action_sequence, total_cost = shape_consistency_manager.shape_consistency(sharding_spec_source, sharding_spec_target)
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print(f'transform_path: {transform_path}')
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print(f'comm_action_sequence: {comm_action_sequence}')
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print(f'total_cost: {total_cost}')
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output:
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transform_path: [DistSpec:
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shard_sequence: R,S01,R
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device_mesh_shape: (4, 4), DistSpec:
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shard_sequence: R,S0,R
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device_mesh_shape: (4, 4), DistSpec:
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shard_sequence: S0,R,R
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device_mesh_shape: (4, 4), DistSpec:
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shard_sequence: S01,R,R
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device_mesh_shape: (4, 4)]
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comm_action_sequence: [CommSpec:(comm_pattern:allgather, gather_dim:1, logical_process_axis:1),
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CommSpec:(comm_pattern:all2all, gather_dim:1, shard_dim:0, logical_process_axis: 0),
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CommSpec:(comm_pattern:shard, shard_dim:0, logical_process_axis:1)]
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total_cost: 12294.402000000002
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'''
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MAX_TRANSFORM_STEPS = 20
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total_cost_dict = {'forward': 0, 'backward': 0, 'total': 0}
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total_steps = 0
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transform_path = []
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comm_action_sequence = []
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spec_pairs = (str(source_spec.sharding_sequence), str(target_spec.sharding_sequence))
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self.cached_spec_pairs_transform_path[spec_pairs] = (None, None)
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# We do nothing if the sharding spec is all the same.
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if source_spec.sharding_sequence_difference(target_spec) == 0:
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self.cached_spec_pairs_transform_path[spec_pairs] = (transform_path, comm_action_sequence)
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return (transform_path, comm_action_sequence, total_cost_dict)
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temp_sharding_spec = source_spec
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transform_path.append(temp_sharding_spec)
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# To avoid dead loop, the loop will break after MAX_TRANSFORM_STEPS transforms
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while total_steps <= MAX_TRANSFORM_STEPS:
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valid_transform_spec_dict = self.get_all_one_step_transform_spec(temp_sharding_spec, total_cost_dict)
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best_difference_score = math.inf
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for sharding_spec, info_pairs in valid_transform_spec_dict.items():
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comm_spec, cost_dict = info_pairs
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spec_difference = sharding_spec.sharding_sequence_difference(target_spec)
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|
|
|
if spec_difference == 0:
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|
for phase, cost in total_cost_dict.items():
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|
total_cost_dict[phase] = cost + cost_dict[phase]
|
|
transform_path.append(sharding_spec)
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|
comm_action_sequence.append(comm_spec)
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|
self.cached_spec_pairs_transform_path[spec_pairs] = (transform_path, comm_action_sequence)
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|
return (transform_path, comm_action_sequence, total_cost_dict)
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|
|
|
if spec_difference < best_difference_score:
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|
temp_sharding_spec = sharding_spec
|
|
temp_cost_dict = cost_dict
|
|
temp_comm_spec = comm_spec
|
|
best_difference_score = spec_difference
|
|
|
|
transform_path.append(temp_sharding_spec)
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|
comm_action_sequence.append(temp_comm_spec)
|
|
for phase, cost in total_cost_dict.items():
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|
total_cost_dict[phase] = cost + temp_cost_dict[phase]
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|
total_steps += 1
|
|
|
|
raise RuntimeError(f"Could not find a valid transform path with in {MAX_TRANSFORM_STEPS} steps.")
|
|
|
|
def apply(self, tensor_with_sharding_spec: torch.Tensor, target_spec: ShardingSpec) -> torch.Tensor:
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|
'''
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|
Apply target_spec to tensor with source sharding spec, the transform path is generated by the
|
|
shape_consistency method.
|
|
|
|
Argument:
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|
tensor_with_sharding_spec (torch.Tensor): a tensor with source sharding spec to be transformed to the target spec.
|
|
target_spec (ShardingSpec): The tensor transform processes will be directed by the target_spec.
|
|
|
|
Example:
|
|
physical_mesh_id = torch.arange(0, 4)
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|
mesh_shape = (2, 2)
|
|
# [[0, 1,
|
|
# [2, 3]]
|
|
device_mesh = DeviceMesh(physical_mesh_id, mesh_shape, init_process_group=True)
|
|
entire_shape = torch.Size((4, 2))
|
|
shape_consistency_manager = ShapeConsistencyManager()
|
|
dim_partition_source = {0: [0]}
|
|
dim_partition_target = {1: [0]}
|
|
|
|
# DistSpec:
|
|
# shard_sequence: S0,R
|
|
# device_mesh_shape: (2, 2)
|
|
sharding_spec_source = ShardingSpec(device_mesh, entire_shape, dim_partition_source)
|
|
|
|
# DistSpec:
|
|
# shard_sequence: R,S0
|
|
# device_mesh_shape: (2, 2)
|
|
sharding_spec_target = ShardingSpec(device_mesh, entire_shape, dim_partition_target)
|
|
|
|
if rank in (0, 1):
|
|
sharded_tensor_0 = torch.zeros(2, 1)
|
|
sharded_tensor_1 = torch.ones(2, 1)
|
|
# tensor([[0., 1.],
|
|
# [0., 1.]])
|
|
tensor_to_comm = torch.cat((sharded_tensor_0, sharded_tensor_1), 1).cuda()
|
|
if rank in (2, 3):
|
|
sharded_tensor_0 = torch.ones(2, 1) * 2
|
|
sharded_tensor_1 = torch.ones(2, 1) * 3
|
|
# tensor([[2., 3.],
|
|
# [2., 3.]])
|
|
tensor_to_comm = torch.cat((sharded_tensor_0, sharded_tensor_1), 1).cuda()
|
|
|
|
tensor_to_comm.sharding_spec = sharding_spec_source
|
|
shape_consistency_manager.apply(tensor_to_comm, sharding_spec_target)
|
|
print(tensor_to_comm)
|
|
|
|
Output in rank0 and rank2:
|
|
tensor([[0.],
|
|
[0.],
|
|
[2.],
|
|
[2.]])
|
|
|
|
Output in rank1 and rank3:
|
|
tensor([[1.],
|
|
[1.],
|
|
[3.],
|
|
[3.]])
|
|
'''
|
|
_, comm_action_sequence, _ = self.shape_consistency(tensor_with_sharding_spec.sharding_spec, target_spec)
|
|
for comm_spec in comm_action_sequence:
|
|
tensor_with_sharding_spec = comm_spec.covert_spec_to_action(tensor_with_sharding_spec)
|
|
tensor_with_sharding_spec.sharding_spec = target_spec
|
|
return tensor_with_sharding_spec
|
|
|
|
def apply_for_autoparallel_runtime(self, tensor, source_spec, target_spec):
|
|
_, comm_action_sequence, _ = self.shape_consistency(source_spec, target_spec)
|
|
for comm_spec in comm_action_sequence:
|
|
tensor = comm_spec.covert_spec_to_action(tensor)
|
|
tensor.sharding_spec = target_spec
|
|
return tensor
|