[Zerobubble] merge main. (#6142)

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* [zerobubble]Support ZeroBubble Pipeline (#6034)

* [feat] add zerobubble pp (just a frame now); add POC test for dx_dw; add test for zerobubble;

* [feat] add dw test;

* [fix] fix weight not close;

* [update] update text;

* [feat] add test run_fwd_bwd automatic scheduling;

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* [feat] zerobubble support moehybridplugin;

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cast_to_fp8, cast_from_fp8, all_reduce_fp8

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* [Feature] Enable PP + SP for llama (#5868)

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* [ShardFormer] Add Ulysses Sequence Parallelism support for Command-R, Qwen2 and ChatGLM (#5897)

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* fix test data

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* remove real data path

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* [Hotfix] Fix ZeRO typo #5936

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* fix style

* fix style

* fix style

* [shardformer] hotfix attn mask (#5945)

* [shardformer] hotfix attn mask (#5947)

* [Feat] Distrifusion Acceleration Support for Diffusion Inference (#5895)

* Distrifusion Support source

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* sd3 benchmark

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* [chore] minor fix

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* [lora] lora support hybrid parallel plugin (#5956)

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* [fp8] add fp8 linear (#5967)

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* [hotfix] moe hybrid parallelism benchmark & follow-up fix (#6048)

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* [fix] fix llama, mixtral benchmark zbv loss none bug; update mixtral & llama policy and modeling;

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* [fix] fix llama modeling policy;

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* [fix] fix test zerobubble

* [fix] fix handle name; rm useless comments;

* [fix] fix send recv signature;

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* [fix] rm debug info; update llama policy; update wait handle

* [fix] fix test_lora

* [fix] fix test_lora in llama policy

* [fix] fix wait handle in run_fwd_bwd

* [fix] remove debug info;

* [fix] rm unused comments

* [fix] fix fp8 overlap code

* [fix] fix yml file & v_schedule comments

* [fix] rm fwd only meta cache comments;

---------

Co-authored-by: flybird11111 <1829166702@qq.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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This commit is contained in:
duanjunwen
2024-11-19 19:00:36 +08:00
committed by GitHub
parent 184a653704
commit e0c68ab6d3
35 changed files with 3681 additions and 122 deletions

View File

@@ -1,9 +1,11 @@
from .base import PipelineSchedule
from .interleaved_pp import InterleavedSchedule
from .one_f_one_b import OneForwardOneBackwardSchedule
from .zero_bubble_pp import ZeroBubbleVPipeScheduler
__all__ = [
"PipelineSchedule",
"OneForwardOneBackwardSchedule",
"InterleavedSchedule",
"ZeroBubbleVPipeScheduler",
]

View File

@@ -137,6 +137,16 @@ def retain_grad(x: Any) -> None:
x.retain_grad()
def require_grad(x: Any) -> None:
"""Call require_grad on a tensor.
Args:
x (Any): Object to be called.
"""
if isinstance(x, torch.Tensor) and not x.requires_grad:
x.requires_grad_()
def detach(x: Any) -> Any:
"""Call detach() on a tensor.
@@ -151,6 +161,34 @@ def detach(x: Any) -> Any:
return x
def clone(x: Any) -> Any:
"""Call clone() on a tensor.
Args:
x (Any): Object to be called.
Returns:
Any: The cloned object.
"""
if isinstance(x, torch.Tensor):
return x.clone()
return x
def release_tensor_data(x: Any) -> Any:
"""Call untyped_storage().resize_(0) on a tensor. Use to release tensor.data and keep grad_fn.
Args:
x (Any): Object to be called.
Returns:
Any: The deallocate .data object.
"""
if isinstance(x, torch.Tensor):
return x.data.untyped_storage().resize_(0)
return x
def merge_batch(data: List[Any], batch_size_dim=0) -> Any:
"""Merge micro batches into a batch.

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@@ -0,0 +1,449 @@
# Refer from Zero Bubble Pipeline Parallelism.
# Github: https://github.com/sail-sg/zero-bubble-pipeline-parallelism
# Paper: https://arxiv.org/abs/2401.10241
# The following applies to all files unless otherwise noted:
# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of NVIDIA CORPORATION nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from collections import deque
from dataclasses import dataclass
@dataclass(eq=True, frozen=True)
class ScheduledNode:
type: str
chunk: int
stage: int
minibatch: int
start_time: int = 0
completion_time: int = 0
rollback: bool = False
class PipelineGraph(object):
"""PipelineGraph"""
def __init__(
self,
n_stage,
n_micro,
f_cost,
b_cost,
w_cost,
c_cost,
f_mem,
b_mem,
w_mem,
max_mem=None,
):
self.n_node = 6 * n_stage * n_micro
self.n_stage = n_stage
self.n_micro = n_micro
self.f_cost = f_cost
self.b_cost = b_cost
self.w_cost = w_cost
self.c_cost = c_cost
self.f_mem = f_mem
self.b_mem = b_mem
self.w_mem = w_mem
self.fbw_cost = [f_cost, b_cost, w_cost]
self.fbw_mem = [f_mem, b_mem, w_mem]
self.max_mem = max_mem or f_mem * self.n_stage * 2
def get_id(self, cat, chunk, stage, micro):
return (
cat * 2 * self.n_stage * self.n_micro + chunk * self.n_stage * self.n_micro + stage * self.n_micro + micro
)
def try_v_schedule(self, fill_f=True, fill_b=True, approved_bubble=None):
count = []
for i in range(self.n_stage):
count.append([0] * 6)
end_time = [-1] * self.n_node
cur_time = [0] * self.n_stage
mem = [0] * self.n_stage
stage_bubble = [0] * self.n_stage
pending_w = [deque() for _ in range(self.n_stage)]
schedule = [[] for _ in range(self.n_stage)]
stage_str = [" " * i for i in range(self.n_stage)]
if approved_bubble is None:
approved_bubble = [-1] * self.n_stage
max_approved_bubble = max(approved_bubble)
def get_max_stage_bubble(stage=-1):
max_stage_bubble = 0
for bb in stage_bubble:
max_stage_bubble = max(max_stage_bubble, bb)
if stage >= 0:
max_stage_bubble = max(max_stage_bubble, max_approved_bubble - approved_bubble[stage])
return max_stage_bubble
def put_w(stage):
assert len(pending_w[stage]) > 0
_, chunk_, _ = pending_w[stage].popleft()
put(2, chunk_, stage)
def put(cat, chunk, stage, assert_cnt=True):
_tmp = _no_bubble = cur_time[stage] + self.fbw_cost[cat]
_cnt = count[stage][cat * 2 + chunk]
# assert _cnt < self.n_micro
if _cnt >= self.n_micro:
if not assert_cnt:
stage_str[stage] += " "
cur_time[stage] = _tmp # TODO
return
assert False
assert mem[stage] + self.fbw_mem[cat] <= self.max_mem
stage_str[stage] += "FfBbWw"[cat * 2 + chunk] + str(_cnt + 1) + " " * (3 - len(str(_cnt + 1)))
if cat > 0 or chunk > 0:
last_id = cat * 2 + chunk - 1
if cat < 2:
assert end_time[self.get_id(last_id // 2, last_id % 2, stage, _cnt)] >= 0
else:
assert end_time[self.get_id(1, chunk, stage, _cnt)] >= 0
if chunk == 1 and cat < 2:
if stage < self.n_stage - 1:
_fa_id = self.get_id(cat, chunk, stage + 1, _cnt)
assert end_time[_fa_id] >= 0
_tmp = max(_tmp, end_time[_fa_id] + self.c_cost + self.fbw_cost[cat])
if chunk == 0 and cat < 2:
if stage > 0:
_fa_id = self.get_id(cat, chunk, stage - 1, _cnt)
assert end_time[_fa_id] >= 0, f"{cat}, {chunk}, {stage}, {_cnt}"
_tmp = max(_tmp, end_time[_fa_id] + self.c_cost + self.fbw_cost[cat])
_id = self.get_id(cat, chunk, stage, _cnt)
if count[stage][0] > 0:
stage_bubble[stage] += _tmp - _no_bubble
end_time[_id] = _tmp
cur_time[stage] = _tmp
mem[stage] += self.fbw_mem[cat]
# noinspection PyTypeChecker
schedule[stage].append((cat, chunk, _cnt))
if cat == 1:
pending_w[stage].append((2, chunk, _cnt))
count[stage][cat * 2 + chunk] += 1
for i in range(self.n_stage):
put(0, 0, i)
for i in range(self.n_stage - 1, -1, -1):
if i == self.n_stage - 1:
put(0, 1, i)
continue
tmp = end_time[self.get_id(0, 1, i + 1, 0)] + self.c_cost
while (
mem[i] + self.fbw_mem[0] * (2 + i * 2) <= self.max_mem
and cur_time[i] + self.fbw_cost[0] <= tmp
and count[i][0] < self.n_micro
):
for j in range(i + 1):
put(0, 0, j)
put(0, 1, i)
iter_chunk_ = 0
end_tmp = 0
for i in range(self.n_stage):
if i == 0:
end_tmp = cur_time[0] + self.fbw_cost[1]
continue
tmp = end_tmp + self.c_cost
while (
count[i][0] + count[i][1] < count[i - 1][0] + count[i - 1][1]
or count[i][1] <= count[i - 1][1] < self.n_micro
):
for j in range(self.n_stage - 1, i - 1, -1):
if count[j][iter_chunk_] < self.n_micro:
put(0, iter_chunk_, j)
iter_chunk_ = 1 - iter_chunk_
for _ in range(2 * self.n_micro):
# check mem before putting b
for i in range(self.n_stage):
while mem[i] + self.fbw_mem[1] > self.max_mem:
assert len(pending_w[i]) > 0
put_w(i)
b0_ranks, b1_ranks = [], []
for i in range(self.n_stage):
if count[i][3] >= count[i][2]:
b0_ranks.append(i)
elif i == self.n_stage - 1:
b1_ranks.append(i)
else:
fa_id = self.get_id(1, 1, i + 1, count[i][3])
if end_time[fa_id] >= 0 or count[i][2] >= self.n_micro:
b1_ranks.append(i)
else:
b0_ranks.append(i)
b_ranks = []
# put b1
for i in reversed(b1_ranks):
b_ranks.append((i, 1))
# put b0
for i in b0_ranks:
b_ranks.append((i, 0))
for i, _chunk_ in b_ranks:
fa_id = -1
if _chunk_ == 1 and i < self.n_stage - 1:
fa_id = self.get_id(1, 1, i + 1, count[i][3])
if _chunk_ == 0 and i > 0:
fa_id = self.get_id(1, 0, i - 1, count[i][2])
while (
len(pending_w[i]) > 0
and fa_id >= 0
and end_time[fa_id] + self.c_cost >= cur_time[i] + self.fbw_cost[2]
):
# fill the bubble
put_w(i)
if (
len(pending_w[i]) > 0
and end_time[fa_id] + self.c_cost - cur_time[i] > get_max_stage_bubble(i) - stage_bubble[i]
):
if _chunk_ == 1:
put_w(i)
elif fill_b:
put_w(i)
put(1, _chunk_, i)
# put f
for i in range(self.n_stage):
if count[i][1] >= self.n_micro:
continue
put_item = None
if count[i][1] >= count[i][0]:
put_item = 0
elif i == self.n_stage - 1:
put_item = 1
else:
if end_time[self.get_id(0, 1, i + 1, count[i][1])] >= 0:
put_item = 1
elif count[i][0] < self.n_micro:
if i == 0:
put_item = 0
elif end_time[self.get_id(0, 0, i - 1, count[i][0])] >= 0:
put_item = 0
if put_item is None:
continue
# check mem before putting f
while mem[i] + self.fbw_mem[0] > self.max_mem:
assert len(pending_w[i]) > 0
put_w(i)
fa_id = -1
if put_item == 0 and i > 0:
fa_id = self.get_id(0, 0, i - 1, count[i][0])
if put_item == 1 and i < self.n_stage - 1:
fa_id = self.get_id(0, 1, i + 1, count[i][1])
while (
len(pending_w[i]) > 0
and fa_id >= 0
and end_time[fa_id] + self.c_cost >= cur_time[i] + self.fbw_cost[2]
):
# fill the bubble
put_w(i)
if (
len(pending_w[i]) > 0
and end_time[fa_id] + self.c_cost - cur_time[i] > get_max_stage_bubble(i) - stage_bubble[i]
):
if fill_f:
put_w(i)
put(0, put_item, i)
for i in range(self.n_stage):
while len(pending_w[i]) > 0:
put_w(i)
max_bubble = get_max_stage_bubble()
expected_time = sum(self.fbw_cost) * self.n_micro * 2
max_bubble / expected_time
if max_approved_bubble < 0 or max_bubble < max_approved_bubble:
_schedule, _end_time, _max_bubble = self.try_v_schedule(
fill_f=fill_f,
fill_b=fill_b,
approved_bubble=stage_bubble,
)
if _max_bubble < max_bubble:
return _schedule, _end_time, _max_bubble
return schedule, end_time, max_bubble
def print_details(self, end_time, print_scaling=1):
for stage in range(self.n_stage):
stage_str = ["."] * int(max(end_time) / print_scaling)
for _cat in range(3):
for _chunk in range(2):
for _micro in range(self.n_micro):
_id = self.get_id(_cat, _chunk, stage, _micro)
if end_time[_id] < 0:
continue
end = int(end_time[_id] / print_scaling)
start = int((end_time[_id] - self.fbw_cost[_cat]) / print_scaling)
for j in range(start, end):
if j == start or j == end - 1:
stage_str[j] = "FfBbWw"[_cat * 2 + _chunk]
elif j == start + 1:
if _micro >= 10:
stage_str[j] = str(_micro // 10)
else:
stage_str[j] = str(_micro)
elif j == start + 2 and _micro >= 10:
stage_str[j] = str(_micro % 10)
else:
stage_str[j] = "-"
_str = ""
for _c in stage_str:
_str += _c
print(_str)
def get_v_schedule(self, only_run_time=False):
schedule, end_time, max_bubble = None, None, None
expected_time = sum(self.fbw_cost) * self.n_micro * 2
for fill_b in [True, False]:
for fill_f in [True, False]:
_schedule, _end_time, _max_bubble = self.try_v_schedule(fill_b=fill_b, fill_f=fill_f)
if max_bubble is None or _max_bubble < max_bubble:
max_bubble = _max_bubble
schedule = _schedule
end_time = _end_time
if only_run_time:
return max_bubble + expected_time
max_bubble / (expected_time + max_bubble)
local_order = [[] for _ in range(self.n_stage)]
comm_id = {}
comm_id_counter = 0
post_validation_time = 0
for i in range(self.n_stage - 1, -1, -1):
pv_id = min(2 * (self.n_stage - 1 - i), self.n_micro - 1)
post_validation_time = max(
post_validation_time, end_time[self.get_id(0, 0, i, pv_id)] - self.fbw_cost[0] - self.c_cost
)
# post_validation_time = 0
for it in ["RECV_", "SEND_", ""]:
if i == 0 and it == "SEND_":
continue
if i == self.n_stage - 1 and it == "RECV_":
continue
# stage_ = i - 1 if it == "RECV_" else i
stage_ = i
local_order[stage_].append(
ScheduledNode(
type=it + "POST_VALIDATION",
chunk=0,
stage=stage_,
minibatch=0,
start_time=post_validation_time,
completion_time=post_validation_time,
)
)
comm_id[local_order[stage_][-1]] = comm_id_counter
comm_id_counter += 1
for i in range(self.n_stage):
for _cat_, _chunk_, _micro_ in schedule[i]:
complete_time = end_time[self.get_id(_cat_, _chunk_, i, _micro_)]
local_order[i].append(
ScheduledNode(
type="FBW"[_cat_],
chunk=_chunk_ if _cat_ == 0 else 1 - _chunk_,
stage=i,
minibatch=_micro_,
start_time=complete_time - self.fbw_cost[_cat_],
completion_time=complete_time,
)
)
if _cat_ == 2: # no communication for W
continue
cat_str = "FORWARD" if _cat_ == 0 else "BACKWARD"
def communicate(send_recv, stage_):
# noinspection PyTypeChecker
local_order[stage_].append(
ScheduledNode(
type=send_recv + cat_str,
chunk=_chunk_ if _cat_ == 0 else 1 - _chunk_,
stage=stage_,
minibatch=_micro_,
start_time=complete_time,
completion_time=complete_time,
)
)
comm_id[local_order[stage_][-1]] = comm_id_counter
if _chunk_ == 1 and i > 0:
communicate("SEND_", i)
communicate("RECV_", i - 1)
if _chunk_ == 0 and i < self.n_stage - 1:
communicate("SEND_", i)
communicate("RECV_", i + 1)
comm_id_counter += 1
for rank in range(self.n_stage):
# For nodes with the same timestamp on the same stage, communication will be prioritized.
def even_breaker(x: ScheduledNode):
# Compute nodes are always delayed.
if x.type in ["F", "B", "W"]:
return comm_id_counter
# For comm nodes, order by their unique comm id
return comm_id[x]
local_order[rank] = list(sorted(local_order[rank], key=lambda x: (x.start_time, even_breaker(x))))
# If a recv with intersects with previous computation, reorder them so that recv
# is executed before computation and hence can be overlapped.
for i in range(len(local_order[rank])):
if (
i > 0
and local_order[rank][i - 1].type in {"F", "B", "W"}
and local_order[rank][i].type.startswith("RECV")
and "POST_VALIDATION" not in local_order[rank][i].type
and local_order[rank][i].start_time <= local_order[rank][i - 1].completion_time
):
local_order[rank][i], local_order[rank][i - 1] = local_order[rank][i - 1], local_order[rank][i]
local_order_with_rollback = [[] for _ in range(self.n_stage)]
for rank in range(self.n_stage):
rollback_comm = set()
if rank > 0:
for node in local_order[rank - 1]:
if node.type == "POST_VALIDATION":
break
if node.type == "SEND_FORWARD":
assert node.chunk == 0
rollback_comm.add(node.minibatch)
for node in local_order[rank]:
if node.type == "RECV_FORWARD" and node.chunk == 0 and node.minibatch in rollback_comm:
rollback = True
rollback_comm.remove(node.minibatch)
else:
rollback = False
local_order_with_rollback[rank].append(
ScheduledNode(
type=node.type,
chunk=node.chunk,
stage=node.stage,
minibatch=node.minibatch,
start_time=node.start_time,
completion_time=node.completion_time,
rollback=rollback,
)
)
assert len(rollback_comm) == 0
return local_order_with_rollback

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@@ -0,0 +1,958 @@
from functools import partial
from typing import Any, Callable, Dict, Iterable, List, Optional, Union
import torch
import torch.cuda
import torch.distributed
from torch.nn import Module, ModuleList
from torch.utils._pytree import tree_flatten, tree_map
from colossalai.accelerator import get_accelerator
from colossalai.interface import OptimizerWrapper
from colossalai.pipeline.p2p import PipelineP2PCommunication, create_send_metadata
from colossalai.pipeline.schedule.v_schedule import ScheduledNode
from colossalai.pipeline.stage_manager import PipelineStageManager
from colossalai.pipeline.weight_grad_store import WeightGradStore
from ._utils import (
clone,
detach,
get_batch_size,
get_micro_batch,
merge_batch,
model_forward,
release_tensor_data,
require_grad,
retain_grad,
to_device,
)
from .base import PipelineSchedule
AUTO_SCHEDULE_COMMUNICATION_TYPES = {"RECV_FORWARD", "RECV_BACKWARD", "SEND_FORWARD", "SEND_BACKWARD"}
def _wait_p2p(wait_handles: List[torch.cuda.Event]) -> None:
if wait_handles is not None:
for req in wait_handles:
req.wait()
class ZeroBubbleVPipeScheduler(PipelineSchedule):
def __init__(
self,
stage_manager: PipelineStageManager,
schedule: List[ScheduledNode],
num_model_chunks: int,
num_microbatch: Optional[int] = None,
microbatch_size: Optional[int] = None,
enable_metadata_cache: bool = True,
overlap_p2p: bool = True,
):
super().__init__(stage_manager)
# batch info
self.num_microbatch = num_microbatch
self.microbatch_size = microbatch_size
self.num_model_chunks = num_model_chunks
self.batch: Any
self.batch_size: int
self.last_batch_size: Optional[int] = None
self.microbatch_offset: List[int]
self.schedules = schedule
# TODO: optim post valid
self.do_post_validation = False
# P2PMeta cache
self.enable_metadata_cache = enable_metadata_cache
# check send_tensor_metadata, send_grad_metadata
# pp4 as sample, we should follow this meta strategy
# send_tensor_meta(fwd) send_grad_meta(bwd)
# chunk0 | chunk1 chunk0 | chunk 1
# stage 0 T | F F | T
# stage 1 T | T T | T
# stage 2 T | T T | T
# stage 3 F | T F | T
if stage_manager.is_first_stage(ignore_chunk=True):
self.send_tensor_metadata = [True, False]
self.send_grad_metadata = [False, True]
elif stage_manager.is_last_stage(ignore_chunk=True):
self.send_tensor_metadata = [False, True]
self.send_grad_metadata = [True, False]
else:
self.send_tensor_metadata = [True, True]
self.send_grad_metadata = [True, True]
# meta cache buffer
self.tensor_metadata_recv = [None, None] # [chunk 0 meta, chunk 1 meta]
self.grad_metadata_recv = [None, None]
# P2P communication
self.comm = PipelineP2PCommunication(stage_manager, overlap_p2p=overlap_p2p)
# init communication map
self.communication_map = {
"SEND_FORWARD": self.send_forward,
"RECV_FORWARD": self.recv_forward,
"SEND_BACKWARD": self.send_backward,
"RECV_BACKWARD": self.recv_backward,
}
# init buffer
self._free_buffers()
def _free_buffers(self):
# free local buffer
# two dim array, first dim is the model chunk, second dim is the microbatch queue
# x & y buffer for schedule b
self.input_tensors = [[], []]
self.output_tensors = [[], []]
# y & dy buffer for schedule w
self.output_tensors_dw = [[], []]
self.output_tensors_grad_dw = [[], []]
# buffer for communication
self.send_forward_buffer = [[], []] # [chunk0:[torch.Tensor], chunk1:[torch.Tensor]]
self.recv_forward_buffer = [
[],
[],
] # [chunk0:[(torch.Tensor, wait_handle)], chunk1:[(torch.Tensor, wait_handle)]]
self.send_backward_buffer = [[], []] # [chunk0:[torch.Tensor], chunk1:[torch.Tensor]]
self.recv_backward_buffer = [
[],
[],
] # [chunk0:[(torch.Tensor, wait_handle)], chunk1:[(torch.Tensor, wait_handle)]]
# y buffer for local send fwd
self.local_send_forward_buffer = []
# dy buffer for local send bwd
self.local_send_backward_buffer = []
# wait pp buffer
self.wait_handles = []
def assert_buffer_empty(self):
# assert buffer is empty at end
assert len(self.input_tensors[0]) == 0
assert len(self.input_tensors[1]) == 0
assert len(self.output_tensors[0]) == 0
assert len(self.output_tensors[1]) == 0
assert len(self.output_tensors_dw[0]) == 0
assert len(self.output_tensors_dw[1]) == 0
assert len(self.output_tensors_grad_dw[0]) == 0
assert len(self.output_tensors_grad_dw[1]) == 0
assert len(self.send_forward_buffer[0]) == 0
assert len(self.send_forward_buffer[1]) == 0
assert len(self.recv_forward_buffer[0]) == 0
assert len(self.recv_forward_buffer[1]) == 0
assert len(self.send_backward_buffer[0]) == 0
assert len(self.send_backward_buffer[1]) == 0
assert len(self.recv_backward_buffer[0]) == 0
assert len(self.recv_backward_buffer[1]) == 0
assert len(self.local_send_forward_buffer) == 0
assert len(self.local_send_backward_buffer) == 0
def load_batch(self, data_iter: Iterable, device: Optional[torch.device] = None) -> None:
"""Load a batch from data iterator.
Args:
data_iter (Iterable): Data iterator.
device (Optional[torch.device], optional): Target device. Defaults to None.
"""
batch = next(data_iter)
if device is not None:
batch = tree_map(partial(to_device, device=device), batch)
self.microbatch_offset = [0 for _ in range(self.num_model_chunks)]
self.batch = batch
self.batch_size = get_batch_size(batch)
if self.microbatch_size is None:
assert self.batch_size % self.num_microbatch == 0, "Batch size should divided by the number of microbatch"
self.microbatch_size = self.batch_size // self.num_microbatch
if self.num_microbatch is None:
assert self.batch_size % self.microbatch_size == 0, "Batch size should divided by the microbatch size"
self.num_microbatch = self.batch_size // self.microbatch_size
if not self.forward_only:
assert self.last_batch_size is None or self.last_batch_size == self.batch_size
assert self.batch_size == self.microbatch_size * self.num_microbatch
assert (
self.num_microbatch % self.stage_manager.num_stages == 0
), "Number of microbatch should be an integer multiple of number of pipeline parallel devices"
if self.forward_only:
self.num_microbatch = (self.batch_size - 1) // self.microbatch_size + 1
self.last_batch_size = self.batch_size
def load_micro_batch(self, model_chunk_id: int) -> Any:
"""Load a micro batch from the current batch.
Args:
microbatch_id (int): the current model chunk idx.
Returns:
Any: Micro batch.
"""
assert self.microbatch_offset[model_chunk_id] <= self.batch_size, "Microbatches exhausted"
micro_batch = get_micro_batch(self.batch, self.microbatch_offset[model_chunk_id], self.microbatch_size)
self.microbatch_offset[model_chunk_id] += self.microbatch_size
return tree_map(partial(to_device, device=get_accelerator().get_current_device()), micro_batch)
def get_model_chunk_id(self, microbatch_id: int, is_forward: bool) -> int:
"""Helper method to get the model chunk ID given the iteration number.
Args:
microbatch_id (int): the current microbatch idx
forward (bool): if is the forward process
Returns:
int: The model chunk idx of the input microbatch_id
"""
assert (
microbatch_id < self.num_microbatch * self.num_model_chunks
), f"microbatch_id {microbatch_id} is out of range ({self.num_microbatch * self.num_model_chunks})"
microbatch_id_in_group = microbatch_id % (self.stage_manager.num_stages * self.num_model_chunks)
model_chunk_id = microbatch_id_in_group // self.stage_manager.num_stages
if not is_forward:
# Reverse order
model_chunk_id = self.num_model_chunks - model_chunk_id - 1
return model_chunk_id
def recv_forward(self, model_chunk_id: int, prev_rank: int = None) -> List:
"""Copy the forward output from the previous stage in pipeline as the input tensor of this stage.
For ZBV.
Args:
model_chunk_id (int): The current model chunk idx.
prev_rank (int, optional): The rank of the source of the tensor.
Returns:
Any: The input tensor or input tensor list.
Any: The wait handles for the communication.
"""
with self.stage_manager.switch_model_chunk_id(model_chunk_id):
if model_chunk_id == 0:
################
# chunk = 0 & is_first_stage
# do nothing; cause u are chunk 0 in first rank, u have no prev rank;
#################
if self.stage_manager.is_first_stage(ignore_chunk=True):
return []
################
# chunk = 0 & not is_first_stage
# Recv y from PREV_rank as input
#################
else:
prev_rank = self.stage_manager.get_prev_rank()
input_tensor, wait_handles = self.comm.recv_forward(
prev_rank=prev_rank, metadata_recv=self.tensor_metadata_recv[model_chunk_id]
)
if self.enable_metadata_cache and self.tensor_metadata_recv[model_chunk_id] is None:
self.tensor_metadata_recv[model_chunk_id] = create_send_metadata(input_tensor)
self.recv_forward_buffer[model_chunk_id].append((input_tensor, wait_handles))
return wait_handles
else:
################
# chunk = 1 & is_last_stage
# do nothing; cause u get y from local_send_forward_buffer in schedule f
################
if self.stage_manager.is_last_stage(ignore_chunk=True):
# return None, []
return []
################
# chunk = 1 & not is_last_stage
# recv y from NEXT_rank as input
################
else:
next_rank = self.stage_manager.get_next_rank()
input_tensor, wait_handles = self.comm.recv_forward(
next_rank, metadata_recv=self.tensor_metadata_recv[model_chunk_id]
)
if self.enable_metadata_cache and self.tensor_metadata_recv[model_chunk_id] is None:
self.tensor_metadata_recv[model_chunk_id] = create_send_metadata(input_tensor)
self.recv_forward_buffer[model_chunk_id].append((input_tensor, wait_handles))
return wait_handles
def recv_backward(self, model_chunk_id: int, next_rank: int = None) -> List:
"""Copy the gradient tensor from the next stage in pipeline as the input gradient of this stage.
For ZBV.
Args:
model_chunk_id (int): The current model chunk idx.
next_rank (int, optional): The rank of the source of the tensor.
Returns:
Any: The input gradient tensor or gradient tensor list.
Any: The wait handles for the communication.
"""
with self.stage_manager.switch_model_chunk_id(model_chunk_id):
if model_chunk_id == 0:
# bwd chunk0 is right V;
################
# chunk = 0 & is_last_stage
# do nothing; Already get dy from local_send_backward_buffer in schedule b
################
if self.stage_manager.is_last_stage(ignore_chunk=True):
return []
################
# chunk = 0 & not is_last_stage
# Recv bwd from next stage;
################
else:
next_rank = self.stage_manager.get_next_rank()
output_tensor_grad, wait_handles = self.comm.recv_backward(
next_rank, metadata_recv=self.grad_metadata_recv[model_chunk_id]
)
if self.enable_metadata_cache and self.grad_metadata_recv[model_chunk_id] is None:
self.grad_metadata_recv[model_chunk_id] = create_send_metadata(output_tensor_grad)
self.recv_backward_buffer[model_chunk_id].append((output_tensor_grad, wait_handles))
return wait_handles
else:
# bwd chunk1 is left V;
################
# chunk = 1 & is_first_stage
# do nothing; get loss from local
################
if self.stage_manager.is_first_stage(ignore_chunk=True):
return []
################
# chunk = 1 & not first stage
# recv_backward recv bwd from prev stage;
################
else:
prev_rank = self.stage_manager.get_prev_rank()
output_tensor_grad, wait_handles = self.comm.recv_backward(
next_rank=prev_rank, metadata_recv=self.grad_metadata_recv[model_chunk_id]
)
if self.enable_metadata_cache and self.grad_metadata_recv[model_chunk_id] is None:
self.grad_metadata_recv[model_chunk_id] = create_send_metadata(output_tensor_grad)
self.recv_backward_buffer[model_chunk_id].append((output_tensor_grad, wait_handles))
return wait_handles
def send_forward(self, model_chunk_id: int, next_rank: int = None) -> List:
"""Sends the input tensor to the next stage in pipeline.
For ZBV.
Args:
model_chunk_id (int): The current model chunk idx.
next_rank (int, optional): The rank of the recipient of the tensor.
Returns:
Any: The wait handles for the communication.
"""
with self.stage_manager.switch_model_chunk_id(model_chunk_id):
if model_chunk_id == 0:
################
# chunk = 0 && is_last_stage
# do nothing; hold y on local_send_forward_buffer
################
if self.stage_manager.is_last_stage(ignore_chunk=True):
self.send_tensor_metadata[model_chunk_id] = not self.enable_metadata_cache
return []
################
# chunk = 0 && not is_last_stage
# self.comm.send_forward send y to NEXT stage
################
else:
next_rank = self.stage_manager.get_next_rank()
output_tensor = self.send_forward_buffer[model_chunk_id].pop(0)
send_handles = self.comm.send_forward(
output_object=output_tensor,
next_rank=next_rank,
send_metadata=self.send_tensor_metadata[model_chunk_id],
)
self.send_tensor_metadata[model_chunk_id] = not self.enable_metadata_cache
return send_handles
else:
################
# chunk = 1 && is_first_stage
# do nothing; Already send LOSS to local_send_backward_buffer in schedule f send part
################
if self.stage_manager.is_first_stage(ignore_chunk=True):
self.send_tensor_metadata[model_chunk_id] = not self.enable_metadata_cache
return []
################
# chunk = 1 && not is_first_stage
# self.comm.send_forward send y to PREV stage
################
else:
prev_rank = self.stage_manager.get_prev_rank()
output_tensor = self.send_forward_buffer[model_chunk_id].pop(0)
send_handles = self.comm.send_forward(
output_tensor, prev_rank, send_metadata=self.send_tensor_metadata[model_chunk_id]
)
self.send_tensor_metadata[model_chunk_id] = not self.enable_metadata_cache
return send_handles
def send_backward(self, model_chunk_id: int, prev_rank: int = None) -> List:
"""Sends the gradient tensor to the previous stage in pipeline.
For ZBV.
Args:
model_chunk_id (int): The current model chunk idx.
prev_rank (int, optional): The rank of the recipient of the tensor
Returns:
Any: The wait handles for the communication.
"""
with self.stage_manager.switch_model_chunk_id(model_chunk_id):
if model_chunk_id == 0:
# bwd chunk0 is right V;
################
# chunk = 0 && is_first_stage
# do nothing; cause u are the first chunk in first stage; bwd end
################
if self.stage_manager.is_first_stage(ignore_chunk=True):
self.send_grad_metadata[model_chunk_id] = not self.enable_metadata_cache
return []
################
# chunk = 0 && not is_first_stage
# Send dx to PREV stage;
################
else:
prev_rank = self.stage_manager.get_prev_rank()
input_tensor_grad = self.send_backward_buffer[model_chunk_id].pop(0)
send_handles = self.comm.send_backward(
input_tensor_grad, prev_rank, send_metadata=self.send_grad_metadata[model_chunk_id]
)
self.send_grad_metadata[model_chunk_id] = not self.enable_metadata_cache
return send_handles
# bwd chunk1 is left V;
else:
################
# chunk = 1 && is_last_stage
# do nothing; Already send input_tensor_grad to local_send_bwd_buffer in schedule b;
################
if self.stage_manager.is_last_stage(ignore_chunk=True):
self.send_grad_metadata[model_chunk_id] = not self.enable_metadata_cache
return []
################
# chunk = 1 && not is_last_stage
# Send dx to NEXT stage;
################
else:
next_rank = self.stage_manager.get_next_rank()
input_tensor_grad = self.send_backward_buffer[model_chunk_id].pop(0)
send_handles = self.comm.send_backward(
input_tensor_grad, next_rank, send_metadata=self.send_grad_metadata[model_chunk_id]
)
self.send_grad_metadata[model_chunk_id] = not self.enable_metadata_cache
return send_handles
def forward_step(
self,
model_chunk: Union[ModuleList, Module],
model_chunk_id: int,
micro_batch: Optional[dict],
input_obj: Optional[dict],
criterion: Callable,
accum_loss: Optional[torch.Tensor] = None,
outputs: Optional[List[Any]] = None,
) -> Union[torch.Tensor, dict]:
"""Forward one step of the pipeline
Args:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
input_obj (Optional[dict]): x;
criterion (Callable): loss function;
accum_loss (Optional[torch.Tensor], optional): Accumulated loss. Defaults to None.
outputs (Optional[List[Any]], optional): List to store the output of the last stage (final output). Defaults to None.
Returns:
Union[torch.Tensor, dict]: The intermediate output (dict) of the current stage. If it is the last stage, the output is the loss (Tensor).
"""
# Load input ids, attention mask and labels
# for the first stage, input_obj is None; So,we use micro_batch as input_obj
# for other stages, input_obj is the output of the previous/next stage containing hidden_states etc.
# Only attention_mask from micro_batch is used
with self.stage_manager.switch_model_chunk_id(model_chunk_id):
# fwd calculate
internal_inputs = {} if input_obj is None else input_obj
internal_inputs["stage_index"] = self.stage_manager.stage_indices[model_chunk_id]
output_obj = model_forward(model_chunk, micro_batch, internal_inputs)
# last layer in model
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
loss = criterion(output_obj, micro_batch) / self.num_microbatch
if accum_loss is not None:
accum_loss.add_(loss.detach())
if outputs is not None:
outputs.append(tree_map(detach, output_obj))
return loss
else:
return output_obj
def backward_b_step(
self,
model_chunk: Union[ModuleList, Module],
model_chunk_id: int,
optimizer: OptimizerWrapper,
# micro_batch: Optional[dict],
input_obj: Optional[dict],
output_obj: Union[dict, torch.Tensor],
output_obj_grad: Optional[dict],
) -> Optional[dict]:
"""Backward dx step of the pipeline; we calculate "dx = w*dy" here;
Args:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
optimizer (OptimizerWrapper): Optimizer to update the model
input_obj (Optional[Tuple(dict)]): x. (microbatch, input_obj)
output_obj (Union[dict, torch.Tensor]): y.
output_obj_grad (dict): dy.
Returns:
Optional[dict]: dx.
"""
# calculate bwd b step ; only dx = w*dy;
# Retain the grad on the input_obj. No need retain_grad microbatch
if input_obj is not None:
tree_map(retain_grad, input_obj)
# x, y, dy list for backward_by_grad; Type: list[tensor];
input_obj_ = []
output_obj_ = []
output_obj_grad_ = []
# For chunk 0 stage 0, use micro_batch as input_obj_; and we don't have to cal microbatch dx.
# For loss backward; output_obj is loss; output_obj_grad should be None
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
assert output_obj_grad is None
input_obj_, _ = tree_flatten(input_obj)
output_obj_.append(output_obj) # LOSS
output_obj_grad_.append(output_obj_grad) # None
# For other chunk stage, use input_obj as input_obj_;
else:
input_obj_, _ = tree_flatten(input_obj)
output_obj_, _ = tree_flatten(output_obj) # y
output_obj_grad_, _ = tree_flatten(output_obj_grad) # dy
# filter item which is not torch.Tensor
input_obj_ = [v for v in input_obj_ if isinstance(v, torch.Tensor) or v is None]
output_obj_ = [v for v in output_obj_ if isinstance(v, torch.Tensor) or v is None]
output_obj_grad_ = [v for v in output_obj_grad_ if isinstance(v, torch.Tensor) or v is None]
try:
ctx = optimizer.no_sync()
except AttributeError:
ctx = model_chunk.no_sync()
with ctx:
optimizer.backward_by_grad(
tensor=output_obj_,
grad=output_obj_grad_,
# inputs=input_obj_,
retain_graph=False,
)
# Format output_obj_grad
input_obj_grad = dict()
if model_chunk_id == 0 and self.stage_manager.is_first_stage(ignore_chunk=True):
pass
else:
for k, v in input_obj.items():
if isinstance(v, torch.Tensor) and v.grad is not None:
input_obj_grad[k] = v.grad
return input_obj_grad
def backward_w_step(
self,
model_chunk: Union[ModuleList, Module],
model_chunk_id: int,
optimizer: OptimizerWrapper,
output_obj: Union[dict, torch.Tensor],
output_obj_grad: Optional[dict],
):
"""Backward dw step of the pipeline; we calculate "dw = x*dy" here;
Args:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
optimizer (OptimizerWrapper): Optimizer to update the model
output_obj (Union[dict, torch.Tensor]): y.
output_obj_grad (dict): dy.
Returns:
Nothing need to return; we only calculate dw then update w;
"""
# calculate bwd w step ; only dw = x*dy;
# y, dy list for w backward_by_grad; Type: list[tensor];
output_obj_ = []
output_obj_grad_ = []
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
# loss backward; output_obj is loss;
output_obj_.append(output_obj) # LOSS
output_obj_grad_.append(None) # None
else:
output_obj_, _ = tree_flatten(output_obj) # y
output_obj_grad_, _ = tree_flatten(output_obj_grad) # dy
# filter item which is not torch.Tensor
output_obj_ = [v for v in output_obj_ if isinstance(v, torch.Tensor) or v is None]
output_obj_grad_ = [v for v in output_obj_grad_ if isinstance(v, torch.Tensor) or v is None]
optimizer.backward_by_grad(
tensor=output_obj_,
grad=output_obj_grad_,
inputs=list(model_chunk.parameters()),
retain_graph=False,
)
def schedule_f(
self,
scheduled_node,
model_chunk: torch.nn.ModuleList,
model_chunk_id: int,
criterion: Callable,
accum_loss: Optional[torch.Tensor] = None,
outputs: Optional[List[Any]] = None,
):
"""A complete forward schedule; Include recv fwd --> cal fwd --> send fwd;
Args:
scheduled_node:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
criterion (Callable): loss function;
accum_loss (Optional[torch.Tensor], optional): Accumulated loss. Defaults to None.
outputs (Optional[List[Any]], optional): List to store the output of the last stage (final output). Defaults to None.
Returns:
Nothing.
"""
micro_batch = self.load_micro_batch(model_chunk_id=model_chunk_id)
# Step1: recv fwd
if model_chunk_id == 0:
# is first stage; get input from microbatch
if self.stage_manager.is_first_stage(ignore_chunk=True):
input_obj = None # (tensor, wait_handle)
else:
input_obj = self.recv_forward_buffer[model_chunk_id].pop(0)
for h in input_obj[1]:
h.wait()
input_obj = input_obj[0]
else:
# is last stage; recv from local
if self.stage_manager.is_last_stage(ignore_chunk=True):
input_obj = self.local_send_forward_buffer.pop(0)
# not last stage; recv from next
else:
input_obj = self.recv_forward_buffer[model_chunk_id].pop(0)
for h in input_obj[1]:
h.wait()
input_obj = input_obj[0]
# Here, let input_obj.requires_grad_()
# if input_obj is not None:
if not isinstance(input_obj, torch.Tensor):
tree_map(require_grad, input_obj)
# Also requires_grad_ for micro_batch in stage 0 chunk 0 fwd,
# tree_map(torch.Tensor.requires_grad_, micro_batch)
# Step2: fwd step
output_obj = self.forward_step(
model_chunk=model_chunk,
model_chunk_id=model_chunk_id,
micro_batch=micro_batch,
input_obj=input_obj,
criterion=criterion,
accum_loss=accum_loss,
outputs=outputs,
)
# Step3:
# 3-1:detach output; detach output for send fwd;
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
# We should not detach bwd LOSS
pass
else:
# detach output
detached_output_obj = tree_map(detach, output_obj)
# 3-2 clone detached_output_obj
detached_output_obj = tree_map(clone, detached_output_obj)
# 3-3 release cloned output.data; release_tensor_data output for bwd b & w; (do not detach output)
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
# We should not release_tensor_data bwd LOSS
pass
else:
# release_tensor_data output
tree_map(release_tensor_data, output_obj)
# add input and output object for backward b
self.input_tensors[model_chunk_id].append(input_obj)
# for bwd b&w, we only need the graph(grad_fn) of output_obj
# Do not release_tensor_data loss, release_tensor_data other output_obj;
if model_chunk_id == 1 and self.stage_manager.is_first_stage(ignore_chunk=True):
self.output_tensors[model_chunk_id].append(output_obj)
else:
self.output_tensors[model_chunk_id].append(output_obj)
# add output to send_fwd_buffer
if model_chunk_id == 0: # chunk 0
# is last stage; send to local_send_forward_buffer
if self.stage_manager.is_last_stage(ignore_chunk=True):
self.local_send_forward_buffer.append(detached_output_obj)
else:
self.send_forward_buffer[model_chunk_id].append(detached_output_obj)
else: # chunk 1
# is first stage; end of fwd; do nothing
if self.stage_manager.is_first_stage(ignore_chunk=True):
pass
else:
self.send_forward_buffer[model_chunk_id].append(detached_output_obj)
def schedule_b(
self,
scheduled_node,
model_chunk: Union[ModuleList, Module],
model_chunk_id: int,
optimizer: OptimizerWrapper,
):
"""A complete backward b schedule; Include recv bwd --> cal bwd step --> send bwd;
Args:
scheduled_node:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
Returns:
Nothing.
"""
# Step1: recv bwd
if model_chunk_id == 0:
# chunk0 is last stage; recv output_grad from local_send_backward_buffer
if self.stage_manager.is_last_stage(ignore_chunk=True):
output_tensor_grad = self.local_send_backward_buffer.pop(0)
# chunk0 not last stage; recv output_grad from recv_backward_buffer
else:
output_tensor_grad = self.recv_backward_buffer[model_chunk_id].pop(0)
for h in output_tensor_grad[1]:
h.wait()
output_tensor_grad = output_tensor_grad[0]
else:
# chunk1, is first stage; recv LOSS from local send bwd buffer
if self.stage_manager.is_first_stage(ignore_chunk=True):
output_tensor_grad = None
# chunk1, not first stage; recv output_grad from recv_backward_buffer
else:
output_tensor_grad = self.recv_backward_buffer[model_chunk_id].pop(0)
for h in output_tensor_grad[1]:
h.wait()
output_tensor_grad = output_tensor_grad[0]
# get input and output object from buffer;
input_obj = self.input_tensors[model_chunk_id].pop(0)
output_obj = self.output_tensors[model_chunk_id].pop(0)
input_object_grad = self.backward_b_step(
model_chunk=model_chunk,
model_chunk_id=model_chunk_id,
optimizer=optimizer,
input_obj=input_obj,
output_obj=output_obj,
output_obj_grad=output_tensor_grad,
)
# Step3: send bwd
if model_chunk_id == 0:
# do nothing; end of bwd;
if self.stage_manager.is_first_stage(ignore_chunk=True):
pass
# save input_object_grad to send_backward_buffer
else:
self.send_backward_buffer[model_chunk_id].append(input_object_grad)
else:
# send to local_send_backward_buffer
if self.stage_manager.is_last_stage(ignore_chunk=True):
self.local_send_backward_buffer.append(input_object_grad)
# send to next
else:
self.send_backward_buffer[model_chunk_id].append(input_object_grad)
WeightGradStore.flush(chunk=model_chunk_id)
def schedule_w(
self,
scheduled_node,
model_chunk: Union[ModuleList, Module],
model_chunk_id: int,
optimizer: OptimizerWrapper,
):
"""A complete backward w schedule; Include get y & dy from buffer --> cal bwd w step(cal dw & update w);
Args:
scheduled_node:
model_chunk (ModuleList or Module): Model Chunk to be run;
model_chunk_id (int): The current model chunk idx;
Returns:
Nothing.
"""
WeightGradStore.pop(chunk=model_chunk_id)
def run_forward_only(
self,
model_chunk: Union[ModuleList, Module],
data_iter: Iterable,
criterion: Callable[..., Any],
return_loss: bool = False,
return_outputs: bool = False,
) -> Dict:
assert self.forward_only
# prepare batch
self.load_batch(data_iter)
# prepare accum loss & output
accum_loss = None
# reset accum loss at fwd end;
if return_loss and self.stage_manager.is_first_stage(ignore_chunk=True):
accum_loss = torch.scalar_tensor(0, device=get_accelerator().get_current_device())
outputs = [] if return_outputs and self.stage_manager.is_first_stage(ignore_chunk=True) else None
# while we still have schedules_node in self.schedules
for it in range(len(self.schedules)):
scheduled_node = self.schedules[it]
if scheduled_node.type in {"RECV_FORWARD", "SEND_FORWARD"}:
# communication
communication_func = self.communication_map[scheduled_node.type]
communication_func(scheduled_node.chunk)
if scheduled_node.type == "F":
self.schedule_f(
scheduled_node=scheduled_node,
model_chunk=model_chunk,
model_chunk_id=scheduled_node.chunk,
criterion=criterion,
accum_loss=accum_loss,
outputs=outputs,
)
# return loss & output
if outputs is not None:
outputs = merge_batch(outputs)
return {"loss": accum_loss, "outputs": outputs}
def run_forward_backward(
self,
model_chunk: Union[ModuleList, Module],
data_iter: Iterable,
criterion: Callable[..., Any],
optimizer: Optional[OptimizerWrapper] = None,
return_loss: bool = False,
return_outputs: bool = False,
) -> Dict:
"""
Runs Zerobubble schedule, with communication between pipeline stages.
"""
# prepare batch
self.load_batch(data_iter)
# prepare accum loss & output
accum_loss = None
# reset accum loss at fwd end;
if return_loss and self.stage_manager.is_first_stage(ignore_chunk=True):
accum_loss = torch.scalar_tensor(0, device=get_accelerator().get_current_device())
outputs = [] if return_outputs and self.stage_manager.is_first_stage(ignore_chunk=True) else None
# while we still have schedules_node in self.schedules
schedule = self.schedules[self.stage_manager.stage] # get schedule by stage (rank)
for it in range(len(schedule)):
scheduled_node = schedule[it]
if scheduled_node.type in AUTO_SCHEDULE_COMMUNICATION_TYPES:
# communication
communication_func = self.communication_map[scheduled_node.type]
wait_handle = communication_func(scheduled_node.chunk)
# We wait recv handle in fwd step and bwd step. Here only need to wait for send handle
if scheduled_node.type in {"SEND_FORWARD", "SEND_BACKWARD"}:
self.wait_handles.append(wait_handle)
elif scheduled_node.type == "F":
self.schedule_f(
scheduled_node=scheduled_node,
model_chunk=model_chunk,
model_chunk_id=scheduled_node.chunk,
criterion=criterion,
accum_loss=accum_loss,
outputs=outputs,
)
elif scheduled_node.type == "B":
self.schedule_b(
scheduled_node=scheduled_node,
model_chunk=model_chunk,
model_chunk_id=scheduled_node.chunk,
optimizer=optimizer,
)
elif scheduled_node.type == "W":
self.schedule_w(
scheduled_node=scheduled_node,
model_chunk=model_chunk,
model_chunk_id=scheduled_node.chunk,
optimizer=optimizer,
)
# wait here to ensure all communication is done
for h in self.wait_handles:
for hh in h:
hh.wait()
# return loss & output
if outputs is not None:
outputs = merge_batch(outputs)
return {"loss": accum_loss, "outputs": outputs}
def forward_backward_step(
self,
model_chunk: Union[ModuleList, Module],
data_iter: Iterable,
criterion: Callable[..., Any],
optimizer: Optional[OptimizerWrapper] = None,
return_loss: bool = False,
return_outputs: bool = False,
) -> dict:
"""
Args:
model_chunk (ModuleList or Module): Model Chunk to be trained. Original interleaved uses a module list whereas shardformer uses entire model + layer specification
data_iter (Iterable): Data iterator.
criterion (Callable[[Any, Any], Tensor]): Criterion to be used. It should take two arguments: model outputs and inputs, and returns loss tensor.
optimizer (OptimizerWrapper, optional): Optimizer to be used. Can be None when only forward is executed. Defaults to None.
return_loss (bool, optional): Whether to return loss. Defaults to False. Whether to return loss.
return_outputs (bool, optional): Whether to return model outputs. Defaults to False. Whether to return model outputs.
Returns:
dict: A dict with keys: 'loss' and 'outputs'.
"""
self.forward_only = not torch.is_grad_enabled()
if optimizer is None:
assert self.forward_only, "Optimizer should be passed when doing backward."
if self.forward_only:
result = self.run_forward_only(model_chunk, data_iter, criterion, return_loss, return_outputs)
else:
result = self.run_forward_backward(
model_chunk, data_iter, criterion, optimizer, return_loss, return_outputs
)
self.assert_buffer_empty()
return result