wehub-resource-sync
629 lines
26 KiB
Python
629 lines
26 KiB
Python
# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import re
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import paddle
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from paddle.base.backward import (
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ProgramStats,
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_append_grad_suffix_,
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_find_op_path_,
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_get_no_grad_set_name,
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_rename_arg_,
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)
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from paddle.distributed.fleet.meta_optimizers.common import OP_ROLE_KEY, OpRole
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from paddle.framework import core
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from paddle.utils import unique_name
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from ..auto_parallel.static.dist_attribute import OperatorDistAttr
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from ..auto_parallel.static.utils import (
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get_loss_op,
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insert_dependencies_for_two_ops,
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is_backward_op,
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is_recompute_exclude_op,
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is_recompute_op,
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naive_set_dist_op_attr_for_program_by_mesh_and_mapping,
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set_dist_op_desc_original_id,
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set_var_dist_attr,
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)
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from ..utils.log_utils import get_logger
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from .pass_base import PassBase, register_pass
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logger = get_logger(logging.INFO)
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class RecomputeState(ProgramStats):
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def __init__(self, block, ops):
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super().__init__(block=block, ops=ops)
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self.seg_op_deps = {}
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self._checkpoints = []
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self._reserved_vars = []
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@property
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def checkpoints(self):
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return self._checkpoints
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@property
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def reserved_vars(self):
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return self._reserved_vars
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def is_recompute(self):
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return any(is_recompute_op(op) for op in self.ops)
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def build_states(self):
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for i, op in enumerate(self.ops):
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if is_backward_op(op):
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break
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for name in op.input_arg_names:
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if name in self.var_op_deps:
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self.var_op_deps[name]["var_as_input_ops"].extend([i])
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else:
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self.var_op_deps[name] = {}
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self.var_op_deps[name]["var_as_input_ops"] = [i]
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self.var_op_deps[name]["var_as_output_ops"] = []
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for name in op.output_arg_names:
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if name in self.var_op_deps:
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self.var_op_deps[name]["var_as_output_ops"].extend([i])
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else:
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self.var_op_deps[name] = {}
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self.var_op_deps[name]["var_as_input_ops"] = []
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self.var_op_deps[name]["var_as_output_ops"] = [i]
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if not is_recompute_op(op):
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self._checkpoints.extend(op.output_arg_names)
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if not is_recompute_exclude_op(op):
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continue
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seg_name = op.attr('op_namescope')
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res = re.search("/auto_parallel/rc_[0-9]*", seg_name)
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seg_name = res.group(0)
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if seg_name not in self.seg_op_deps:
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self.seg_op_deps[seg_name] = [i]
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else:
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assert self.seg_op_deps[seg_name][-1] + 1 == i, (
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"The recompute segment's ops should be continuous"
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)
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self.seg_op_deps[seg_name].extend([i])
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def get_recompute_segments(self, no_recompute_segments=[]):
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segments = []
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for segment_idx in self.seg_op_deps.values():
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if len(segment_idx) == 1:
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continue
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segments.append([segment_idx[0], segment_idx[-1] + 1])
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self._checkpoints.extend(self.ops[segment_idx[-1]].output_arg_names)
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for i in sorted(no_recompute_segments, reverse=True):
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assert i < len(segments), (
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f"the no_recompute_segments idx [{i}] should be lower the number of segment [{len(segments)}]"
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)
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segments.pop(i)
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return segments
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def modify_forward_desc_for_recompute(self, dist_context):
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"""
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If program's forward part has 'dropout' op, this function will insert
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a seed op before it to guarantee that two dropout op have the same outputs.
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"""
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op_types = [op.type for op in self.ops]
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if "dropout" not in op_types and "fused_dropout_add" not in op_types:
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return
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op_idx = 0
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while op_idx < len(self.ops):
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cur_op = self.ops[op_idx]
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if "grad" in cur_op.type:
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break
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if cur_op.type == "seed":
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self._reserved_vars.extend(cur_op.output_arg_names)
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op_idx += 1
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continue
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if cur_op.type not in ["dropout", "fused_dropout_add"]:
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op_idx += 1
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continue
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seed_tensor_name = (
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"seed_tensor" if cur_op.type == "fused_dropout_add" else "Seed"
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)
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if cur_op.input(seed_tensor_name) is not None and len(
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cur_op.input(seed_tensor_name)
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):
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op_idx += 1
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continue
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cur_op_dist_attr = dist_context.get_op_dist_attr_for_program(cur_op)
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# insert seed op to guarantee that two dropout op have the same outputs
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# NOTE Hack for adopt recompute for random control, for more info see dist_dropout.py
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# new seed added by recompute should have a prefix to distinguish with seed added by user or other module.
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op_unique_name = unique_name.generate("rc_seed")
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var_unique_name = unique_name.generate_with_ignorable_key(
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".".join([op_unique_name, 'tmp'])
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)
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self._reserved_vars.append(var_unique_name)
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seed_var = self.block.create_var(
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name=var_unique_name,
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dtype='int32',
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type=core.VarDesc.VarType.DENSE_TENSOR,
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persistable=False,
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stop_gradient=False,
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)
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# set new seed_var's dist_attr
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ref_dims_mapping = [-1]
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ref_process_mesh = cur_op_dist_attr.process_mesh
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seed_var_dist_attr = set_var_dist_attr(
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dist_context,
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seed_var,
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ref_dims_mapping,
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ref_process_mesh,
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chunk_id=cur_op_dist_attr.chunk_id,
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)
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seed = (
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0
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if cur_op.attr("fix_seed") is False
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else int(cur_op.attr("seed"))
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)
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# TODO add dependency for seed op to ensure it be issued just before recompute.
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seed_op = self.block._insert_op_without_sync(
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index=cur_op.idx,
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type="seed",
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inputs={},
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outputs={"Out": seed_var},
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attrs={"seed": seed, "force_cpu": True},
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)
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seed_op._set_attr('op_namescope', cur_op.attr('op_namescope'))
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# set new seed op's dist_attr
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naive_set_dist_op_attr_for_program_by_mesh_and_mapping(
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seed_op,
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ref_process_mesh,
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ref_dims_mapping,
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dist_context,
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chunk_id=cur_op_dist_attr.chunk_id,
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)
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# modify dropout op's desc
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self.ops.insert(op_idx, seed_op)
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cur_op.desc.set_input(seed_tensor_name, [var_unique_name])
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cur_op.desc._set_attr("fix_seed", False)
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cur_op.desc._set_attr("seed", 0)
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cur_op_dist_attr.set_input_dist_attr(
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seed_var.name, seed_var_dist_attr
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)
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op_idx += 2
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self.block._sync_with_cpp()
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def _find_op_index(block, cur_op):
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for idx in range(block.desc.op_size()):
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if cur_op.desc == block.desc.op(idx):
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return idx
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return -1
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def _get_stop_gradients(program, no_grad_set=None):
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"""get no grad var"""
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if no_grad_set is None:
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no_grad_set = set()
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else:
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no_grad_set = _get_no_grad_set_name(no_grad_set)
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no_grad_set_name = set()
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for var in program.list_vars():
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if "@GRAD" in var.name:
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break
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if var.stop_gradient:
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no_grad_set_name.add(_append_grad_suffix_(var.name))
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no_grad_set_name.update(list(map(_append_grad_suffix_, no_grad_set)))
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return no_grad_set_name
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def _add_needed_descs_to_block(
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descs, block, main_block, vars_should_be_hold, dist_context
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):
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"""
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Get the recomputed ops which will insert the backward part
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"""
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if len(descs) == 0:
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return []
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result_descs = []
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for desc in descs:
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# if isinstance(desc, framework.Operator):
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if isinstance(desc, paddle.static.Operator):
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desc = desc.desc
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if isinstance(desc, tuple):
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desc = desc[0]
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is_needed = False
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for name in desc.output_arg_names():
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if main_block.has_var(name) and main_block.var(name).persistable:
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continue
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if name not in vars_should_be_hold:
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is_needed = True
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if is_needed:
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new_op_desc = block.desc.append_op()
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new_op_desc.copy_from(desc)
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set_dist_op_desc_original_id(new_op_desc, desc, dist_context)
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new_op_desc._set_attr(OP_ROLE_KEY, OpRole.Backward)
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result_descs.append(new_op_desc)
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return result_descs
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def _find_op_path(main_program, loss, no_grad_set=None):
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no_grad_set_name = _get_stop_gradients(main_program, no_grad_set)
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op_path = _find_op_path_(
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main_program.global_block(), [loss], [], no_grad_set_name
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)
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return op_path
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@register_pass("auto_parallel_recompute")
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class RecomputePass(PassBase):
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def __init__(self):
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super().__init__()
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self.set_attr("loss", None)
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self.set_attr("dist_context", None)
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self.set_attr("no_grad_set", None)
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self.set_attr("no_recompute_segments", [])
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def _check_self(self):
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if self.get_attr("dist_context") is None:
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return False
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if self.get_attr("loss") is None:
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return False
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return True
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def _check_conflict(self, other_pass):
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return True
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def get_ops_per_device(self, ops, all_ops_process_meshes, sr=0):
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"""
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Get ops and op_names of each process mesh excluding ops within the first "sr" chunks
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"""
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def reset_recompute_op(op):
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if is_recompute_op(op) or is_recompute_exclude_op(op):
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op._set_attr("op_namescope", "")
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all_process_meshes_count = len(all_ops_process_meshes)
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ops_of_stages = [[] for _ in range(all_process_meshes_count)]
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op_names_of_stages = [[] for _ in range(all_process_meshes_count)]
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pushed_ops_count = 0
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reset_ops_count = 0
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chunk_id = 0
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for op_id, op in enumerate(ops):
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if chunk_id // all_process_meshes_count < sr:
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reset_ops_count += 1
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reset_recompute_op(op)
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if (
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op_id < len(ops) - 1
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and op.dist_attr.process_mesh
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!= ops[op_id + 1].dist_attr.process_mesh
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):
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chunk_id += 1
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if chunk_id // all_process_meshes_count < sr:
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continue
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for id, process_mesh in enumerate(all_ops_process_meshes):
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if op.dist_attr.process_mesh == process_mesh:
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pushed_ops_count += 1
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ops_of_stages[id].append(op)
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op_names_of_stages[id].append(op.type)
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assert len(ops) == reset_ops_count + pushed_ops_count, (
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f"The sum of pushed_ops_count and reset_ops_count must be the same as length of ops, but the sum is {reset_ops_count + pushed_ops_count} while length of ops is {len(ops)}"
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)
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return ops_of_stages, op_names_of_stages
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def _apply_single_impl(self, main_program, startup_program, context):
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loss = self.get_attr("loss")
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no_grad_set = self.get_attr("no_grad_set")
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no_recompute_segments = self.get_attr("no_recompute_segments")
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self._dist_context = self.get_attr("dist_context")
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self._sr = self.get_attr("sr", 0)
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self._refined_ops_patterns = self.get_attr("refined_ops_patterns", [])
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# 0. get op_path which is related to loss
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main_block = main_program.global_block()
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op_path = _find_op_path(main_program, loss, no_grad_set)
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# 1. mark exclude ops for refined-recompute according to ops-patterns(mainly linear and flash_attn)
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# 1.1 get all process_meshes in op_path
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all_ops_process_meshes = []
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for op in op_path:
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if op.dist_attr.process_mesh not in all_ops_process_meshes:
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all_ops_process_meshes.append(op.dist_attr.process_mesh)
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# 1.2 get ops_devices and op_names_devices
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ops_devices, op_names_devices = self.get_ops_per_device(
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op_path, all_ops_process_meshes, self._sr
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)
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all_ops_len = len(op_path)
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all_exclude_ops_ids = [[] for _ in op_names_devices]
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# 1.3 find exclude ops for refined-recompute according to ops-patterns
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for refined_ops_pattern in self._refined_ops_patterns:
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num = refined_ops_pattern['num']
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num = (
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num if num >= 0 else all_ops_len
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) # 'num == -1' represents to all ops
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main_ops = refined_ops_pattern['main_ops']
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pre_ops = refined_ops_pattern['pre_ops']
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suf_ops = refined_ops_pattern['suf_ops']
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main_start_id = len(pre_ops)
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main_ops_len = len(main_ops)
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pattern_ops = pre_ops + main_ops + suf_ops
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pattern_ops_len = len(pattern_ops)
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for id, op_names_device in enumerate(op_names_devices):
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pattern_count = 0
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ops_len_device = len(op_names_device)
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for i in range(ops_len_device - pattern_ops_len + 1):
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if (
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op_names_device[i : i + pattern_ops_len] == pattern_ops
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and pattern_count < num
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):
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pattern_count += 1
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all_exclude_ops_ids[id].extend(
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list(
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range(
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i + main_start_id,
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i + main_start_id + main_ops_len,
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)
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)
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)
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logger.info(
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f"The excluded ops in recompute segments are:\n{all_exclude_ops_ids}"
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)
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# 1.4 mark exclude ops in exclude_ops_ids
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for id, exclude_ops_ids in enumerate(all_exclude_ops_ids):
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for op_id in exclude_ops_ids:
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if is_recompute_op(ops_devices[id][op_id]):
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rc_mark_str = ops_devices[id][op_id].attr("op_namescope")
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ops_devices[id][op_id]._set_attr(
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"op_namescope", rc_mark_str + "_exclude_rc"
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)
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# 2. build recompute state
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rc_state = RecomputeState(main_block, op_path)
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if not rc_state.is_recompute():
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return
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# 3. get the segments to be recomputed
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rc_state.modify_forward_desc_for_recompute(self._dist_context)
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rc_state.build_states()
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segments = rc_state.get_recompute_segments(no_recompute_segments)
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if segments == []:
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return
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for i, (idx1, idx2) in enumerate(segments):
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logger.debug(f"recompute segment[{i + 1}/{len(segments)}]")
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logger.debug(
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f"segment start op: [{rc_state.ops[idx1].type}]: [{rc_state.ops[idx1].input_arg_names}] [{rc_state.ops[idx1].output_arg_names}]"
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)
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logger.debug(
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f"segment end op: [{rc_state.ops[idx2 - 1].type}]: [{rc_state.ops[idx2 - 1].input_arg_names}] [{rc_state.ops[idx2 - 1].output_arg_names}]"
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)
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# 4. get vars that should be hold in memory
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# list of var_names
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vars_should_be_hold = []
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for segment in segments:
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vars_should_be_hold.extend(
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rc_state.get_out_of_subgraph_vars(segment[0], segment[1])
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)
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cross_vars = set(vars_should_be_hold) - set(rc_state.checkpoints)
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logger.debug(
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f"found [{len(cross_vars)}] vars which cross recompute segment: [{cross_vars}],"
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"better checkpoints might be set to reduce those vars"
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)
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vars_should_be_hold.extend(rc_state.reserved_vars)
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vars_should_be_hold.extend(rc_state.get_input_nodes())
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vars_should_be_hold = list(
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set(vars_should_be_hold) | set(rc_state.checkpoints)
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)
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# 5. get the fwd ops desc to be recomputed.
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var_name_dict = {} # varname --> varname.subprog_XXX
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ckpt_ops_dict = {} # ckpt_op_id --> segment_descs
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buffer_block = main_block.program._create_block()
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for i, segment in enumerate(segments[::-1]):
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fwd_ops = op_path[segment[0] : segment[1]]
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var_suffix = f".subprog_{i}"
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for op in fwd_ops:
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input_and_output_names = []
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input_and_output_names.extend(op.input_arg_names)
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input_and_output_names.extend(op.output_arg_names)
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cur_op_dist_attr = (
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self._dist_context.get_op_dist_attr_for_program(op)
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)
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assert cur_op_dist_attr is not None
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for name in input_and_output_names:
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if (
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main_block.var(name).persistable
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or name in vars_should_be_hold
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):
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continue
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|
if name not in var_name_dict:
|
|
ref_process_mesh = cur_op_dist_attr.process_mesh
|
|
if name in op.input_arg_names:
|
|
ref_dims_mapping = (
|
|
cur_op_dist_attr.get_input_dims_mapping(name)
|
|
)
|
|
else:
|
|
ref_dims_mapping = (
|
|
cur_op_dist_attr.get_output_dims_mapping(name)
|
|
)
|
|
|
|
# record recomputed var's old_name and new_name (old_name.subprog_XXX)
|
|
# create new var with new name
|
|
var_name_dict[name] = name + var_suffix
|
|
ref_var = main_block.var(name)
|
|
rc_var = main_block.create_var(
|
|
name=var_name_dict[name],
|
|
shape=ref_var.shape,
|
|
dtype=ref_var.dtype,
|
|
type=ref_var.type,
|
|
persistable=ref_var.persistable,
|
|
stop_gradient=ref_var.stop_gradient,
|
|
)
|
|
# set new recomputed var's dist attr
|
|
set_var_dist_attr(
|
|
self._dist_context,
|
|
rc_var,
|
|
ref_dims_mapping,
|
|
ref_process_mesh,
|
|
chunk_id=cur_op_dist_attr.chunk_id,
|
|
)
|
|
# get recomputed segment's descs
|
|
segment_descs = _add_needed_descs_to_block(
|
|
fwd_ops,
|
|
buffer_block,
|
|
main_block,
|
|
vars_should_be_hold,
|
|
self._dist_context,
|
|
)
|
|
# rename recomputed ops' input and output var name
|
|
for key in var_name_dict:
|
|
_rename_arg_(segment_descs, key, var_name_dict[key])
|
|
|
|
# NOTE: one forward op could be correspond to multiple xxx_grad op.
|
|
# When traversing all grad_ops in reverse, need to set a flag to indicate
|
|
# whether the ckpt and its segment_descs can be used.
|
|
ckpt_op = op_path[segment[1] - 1]
|
|
ckpt_ops_dict[ckpt_op.desc.original_id()] = [True, segment_descs]
|
|
|
|
# 6. insert recomputed fwd ops into backward parse
|
|
ops = main_block.ops
|
|
loss_op = get_loss_op(main_block)
|
|
loss_op_idx = _find_op_index(main_block, loss_op)
|
|
dist_op_context = self._dist_context.dist_op_context
|
|
assert loss_op_idx != -1
|
|
# Traversing all grad_ops in reverse, and if the fwd op corresponding to reverse op is checkpoints,
|
|
# segments ops should be inserted.
|
|
for i in range(len(ops) - 1, loss_op_idx, -1):
|
|
grad_op = ops[i]
|
|
|
|
input_and_output_names = []
|
|
input_and_output_names.extend(grad_op.input_arg_names)
|
|
input_and_output_names.extend(grad_op.output_arg_names)
|
|
|
|
for varname in var_name_dict:
|
|
if varname not in input_and_output_names:
|
|
continue
|
|
self.reset_op_dist_attr(grad_op, var_name_dict)
|
|
_rename_arg_([grad_op.desc], varname, var_name_dict[varname])
|
|
|
|
# insert recomputed ops
|
|
original_id = grad_op.desc.original_id()
|
|
if original_id in dist_op_context.grad_op_id_to_op_id:
|
|
fwd_op_id = dist_op_context.grad_op_id_to_op_id[original_id]
|
|
if fwd_op_id in ckpt_ops_dict and ckpt_ops_dict[fwd_op_id][0]:
|
|
idx = grad_op.idx
|
|
while idx - 1 >= 0 and ops[idx - 1].type == "sum":
|
|
idx -= 1
|
|
segment_descs = ckpt_ops_dict[fwd_op_id][1]
|
|
rc_op = None
|
|
for _, op_desc in reversed(list(enumerate(segment_descs))):
|
|
rc_op = main_block._insert_op_without_sync(
|
|
idx, type='nop'
|
|
)
|
|
rc_desc = rc_op.desc
|
|
rc_desc.copy_from(op_desc)
|
|
rc_desc.set_original_id(rc_desc.id())
|
|
# set recomputed ops' dist attr
|
|
fwd_op_dist_attr = self._dist_context.get_op_dist_attr_for_program_with_id(
|
|
op_desc.original_id()
|
|
)
|
|
assert fwd_op_dist_attr is not None
|
|
self.set_op_dist_attr(
|
|
rc_op, fwd_op_dist_attr, var_name_dict
|
|
)
|
|
|
|
ckpt_ops_dict[fwd_op_id][0] = False
|
|
if rc_op:
|
|
prior_op = main_block.ops[rc_op.idx - 1]
|
|
posterior_op = rc_op
|
|
prior_mesh = (
|
|
self._dist_context.get_op_dist_attr_for_program(
|
|
prior_op
|
|
).process_mesh
|
|
)
|
|
posterior_mesh = (
|
|
self._dist_context.get_op_dist_attr_for_program(
|
|
posterior_op
|
|
).process_mesh
|
|
)
|
|
# NOTE if two recompute segments across two pipeline stages
|
|
# not need dependencies for it
|
|
if prior_mesh == posterior_mesh:
|
|
insert_dependencies_for_two_ops(
|
|
main_block,
|
|
idx,
|
|
prior_op,
|
|
posterior_op,
|
|
self._dist_context,
|
|
is_recompute=True,
|
|
sync=False,
|
|
op_namescope="recompute_segment_dep",
|
|
)
|
|
main_program._sync_with_cpp()
|
|
|
|
def reset_op_dist_attr(self, op, var_name_dict):
|
|
op_dist_attr = self._dist_context.get_op_dist_attr_for_program(op)
|
|
assert op_dist_attr is not None
|
|
for input in op.input_arg_names:
|
|
if input in var_name_dict.keys():
|
|
in_dist_attr = op_dist_attr.get_input_dist_attr(input)
|
|
op_dist_attr.set_input_dist_attr(
|
|
var_name_dict[input], in_dist_attr
|
|
)
|
|
for output in op.output_arg_names:
|
|
if output in var_name_dict.keys():
|
|
out_dist_attr = op_dist_attr.get_output_dist_attr(output)
|
|
op_dist_attr.set_output_dist_attr(
|
|
var_name_dict[output], out_dist_attr
|
|
)
|
|
|
|
def set_op_dist_attr(self, op, old_dist_attr, var_name_dict):
|
|
new_dist_attr = OperatorDistAttr()
|
|
new_dist_attr.is_recompute = True
|
|
new_dist_attr.impl_idx = old_dist_attr.impl_idx
|
|
new_dist_attr.impl_type = old_dist_attr.impl_type
|
|
new_dist_attr.process_mesh = old_dist_attr.process_mesh
|
|
new_dist_attr.chunk_id = old_dist_attr.chunk_id
|
|
for input in old_dist_attr.inputs_dist_attrs.keys():
|
|
if input in var_name_dict.keys():
|
|
in_dist_attr = old_dist_attr.inputs_dist_attrs[input]
|
|
new_dist_attr.set_input_dist_attr(
|
|
var_name_dict[input], in_dist_attr
|
|
)
|
|
else:
|
|
in_dist_attr = old_dist_attr.inputs_dist_attrs[input]
|
|
new_dist_attr.set_input_dist_attr(input, in_dist_attr)
|
|
for output in old_dist_attr.outputs_dist_attrs.keys():
|
|
if output in var_name_dict.keys():
|
|
out_dist_attr = old_dist_attr.outputs_dist_attrs[output]
|
|
new_dist_attr.set_output_dist_attr(
|
|
var_name_dict[output], out_dist_attr
|
|
)
|
|
else:
|
|
out_dist_attr = old_dist_attr.outputs_dist_attrs[output]
|
|
new_dist_attr.set_output_dist_attr(output, out_dist_attr)
|
|
self._dist_context.set_op_dist_attr_for_program(op, new_dist_attr)
|