Lightning-AI
Shuffle order is the same across runs when using strategy='ddp'
Bug description
The batches and their order are the same across different executions of the script when using strategy='ddp' and dataloader with shuffle=True
What version are you seeing the problem on?
v2.2
How to reproduce the bug
Say you have train.py that prints the current input on each training iteration and has shuffling enabled in the dataloader:
import torch
from torch.utils.data import TensorDataset, DataLoader
import torch.nn.functional as F
import lightning.pytorch as pl
class SomeLightningModule(pl.LightningModule):
def __init__(self):
super().__init__()
self.p1 = torch.nn.Parameter(torch.tensor(0.0))
self.p2 = torch.nn.Parameter(torch.tensor(0.0))
def training_step(self, batch):
x, y = batch
print(x.item())
return F.mse_loss(x * self.p1 + self.p2, y)
def configure_optimizers(self):
optimizer = torch.optim.Adam(
self.parameters(),
)
return {
"optimizer": optimizer,
}
lightning_module = SomeLightningModule()
trainer = pl.Trainer(
strategy='ddp',
max_epochs=1,
)
train_dataset = TensorDataset(torch.arange(5).float(), torch.arange(5).float())
train_loader = DataLoader(train_dataset, shuffle=True)
trainer.fit(lightning_module, train_dataloaders=train_loader)
When strategy='ddp', the script will print the same numbers across different runs:
$ python3 train.py
4.0
0.0
1.0
3.0
2.0
$ python3 train.py
4.0
0.0
1.0
3.0
2.0
Such behavior can be unwanted, as people might want to try different orders of batches (e.g. to construct ensembles or get the average performance)
Error messages and logs
# Error messages and logs here please
Environment
Current environment
- CUDA:
- GPU:
- Graphics Device
- available: True
- version: 11.8
- GPU:
- Lightning:
- lightning: 2.2.0.post0
- lightning-utilities: 0.10.1
- pytorch-lightning: 1.7.7
- torch: 2.1.2
- torchaudio: 2.1.2
- torchmetrics: 0.10.3
- torchvision: 0.16.2
- Packages:
- absl-py: 1.3.0
- aiohttp: 3.8.3
- aiosignal: 1.3.1
- alphafold-colabfold: 2.3.6
- altair: 5.4.0
- anarci: 1.3
- antiberty: 0.1.3
- antlr4-python3-runtime: 4.9.3
- anyio: 3.5.0
- appdirs: 1.4.4
- argon2-cffi: 21.3.0
- argon2-cffi-bindings: 21.2.0
- asttokens: 2.0.5
- astunparse: 1.6.3
- async-lru: 2.0.4
- async-timeout: 4.0.2
- attrs: 22.1.0
- babel: 2.11.0
- backcall: 0.2.0
- beautifulsoup4: 4.12.2
- biopython: 1.79
- bleach: 4.1.0
- blinker: 1.5
- bottleneck: 1.3.5
- brotlipy: 0.7.0
- cached-property: 1.5.2
- cachetools: 5.2.0
- certifi: 2023.5.7
- cffi: 1.15.1
- charset-normalizer: 2.1.1
- chex: 0.1.86
- click: 8.1.3
- cmake: 3.28.3
- colabfold: 1.5.5
- colorama: 0.4.6
- comm: 0.1.2
- contextlib2: 21.6.0
- contourpy: 1.0.6
- cryptography: 38.0.3
- cycler: 0.11.0
- debugpy: 1.6.7
- decorator: 5.1.1
- deepspeed: 0.9.5
- defusedxml: 0.7.1
- dm-haiku: 0.0.12
- dm-tree: 0.1.8
- docker-pycreds: 0.4.0
- docstring-parser: 0.15
- einops: 0.8.0
- entrypoints: 0.4
- et-xmlfile: 1.1.0
- etils: 1.5.2
- exceptiongroup: 1.0.4
- executing: 0.8.3
- fastjsonschema: 2.16.2
- filelock: 3.13.1
- flatbuffers: 24.3.25
- flax: 0.8.5
- fonttools: 4.38.0
- frozenlist: 1.3.3
- fsspec: 2024.3.1
- gast: 0.6.0
- gdown: 5.1.0
- gemmi: 0.5.7
- gitdb: 4.0.9
- gitpython: 3.1.29
- gmpy2: 2.1.2
- google-auth: 2.14.1
- google-auth-oauthlib: 0.4.6
- google-pasta: 0.2.0
- grpcio: 1.49.1
- h5py: 3.11.0
- hjson: 3.1.0
- huggingface-hub: 0.22.2
- hydra-core: 1.3.2
- idna: 3.4
- immutabledict: 4.2.0
- importlib-metadata: 4.13.0
- importlib-resources: 6.1.2
- ipykernel: 6.25.0
- ipython: 8.15.0
- ipython-genutils: 0.2.0
- ipywidgets: 8.0.4
- jax: 0.3.25
- jaxlib: 0.3.25+cuda11.cudnn82
- jedi: 0.18.1
- jinja2: 3.1.2
- jmp: 0.0.4
- json5: 0.9.6
- jsonargparse: 4.27.5
- jsonschema: 4.17.3
- jupyter: 1.0.0
- jupyter-client: 7.4.9
- jupyter-console: 6.6.3
- jupyter-core: 5.5.0
- jupyter-events: 0.6.3
- jupyter-lsp: 2.2.0
- jupyter-server: 2.10.0
- jupyter-server-terminals: 0.4.4
- jupyterlab: 4.0.8
- jupyterlab-pygments: 0.1.2
- jupyterlab-server: 2.22.0
- jupyterlab-widgets: 3.0.9
- keras: 3.4.1
- kiwisolver: 1.4.4
- libclang: 18.1.1
- lightning: 2.2.0.post0
- lightning-utilities: 0.10.1
- lit: 18.1.1
- markdown: 3.4.1
- markdown-it-py: 3.0.0
- markupsafe: 2.1.1
- matplotlib: 3.6.2
- matplotlib-inline: 0.1.6
- mdurl: 0.1.2
- mistune: 2.0.4
- mkl-fft: 1.3.1
- mkl-random: 1.2.2
- mkl-service: 2.4.0
- ml-collections: 0.1.1
- ml-dtypes: 0.3.2
- mmcif-pdbx: 2.0.1
- mpi4py: 3.1.4
- mpmath: 1.3.0
- msgpack: 1.0.8
- multidict: 6.0.2
- munkres: 1.1.4
- namex: 0.0.8
- narwhals: 1.5.0
- nbclient: 0.8.0
- nbconvert: 7.10.0
- nbformat: 5.9.2
- nest-asyncio: 1.5.6
- networkx: 3.1
- ninja: 1.11.1
- notebook: 6.3.0
- notebook-shim: 0.2.3
- numexpr: 2.8.4
- numpy: 1.23.5
- oauthlib: 3.2.2
- omegaconf: 2.3.0
- openpyxl: 3.1.5
- opt-einsum: 3.3.0
- optax: 0.2.2
- optree: 0.11.0
- orbax-checkpoint: 0.5.20
- overrides: 7.4.0
- packaging: 21.3
- pandas: 1.5.3
- pandocfilters: 1.5.0
- parso: 0.8.3
- path: 16.2.0
- pathtools: 0.1.2
- pdb2pqr: 3.6.1
- pexpect: 4.8.0
- pickleshare: 0.7.5
- pillow: 9.2.0
- pip: 22.3.1
- platformdirs: 3.10.0
- ply: 3.11
- pmw: 2.0.1
- pooch: 1.6.0
- prody: 2.2.0
- prometheus-client: 0.14.1
- promise: 2.3
- prompt-toolkit: 3.0.43
- propka: 3.5.1
- protobuf: 4.21.9
- psutil: 5.9.4
- ptyprocess: 0.7.0
- pure-eval: 0.2.2
- py-cpuinfo: 9.0.0
- py3dmol: 2.0.4
- pyasn1: 0.4.8
- pyasn1-modules: 0.3.0
- pycollada: 0.8
- pycparser: 2.21
- pydantic: 1.10.11
- pydeprecate: 0.3.2
- pygments: 2.15.1
- pyjwt: 2.6.0
- pykerberos: 1.2.4
- pymol: 2.5.5
- pyopenssl: 22.1.0
- pyparsing: 3.0.9
- pyqt5: 5.15.7
- pyqt5-sip: 12.11.0
- pyrsistent: 0.20.0
- pysocks: 1.7.1
- python-dateutil: 2.8.2
- python-json-logger: 2.0.7
- pytorch-lightning: 1.7.7
- pytz: 2022.7
- pyu2f: 0.1.5
- pyyaml: 6.0
- pyzmq: 25.1.0
- qtconsole: 5.5.1
- qtpy: 2.4.1
- regex: 2023.12.25
- requests: 2.28.1
- requests-oauthlib: 1.3.1
- rfc3339-validator: 0.1.4
- rfc3986-validator: 0.1.1
- rich: 13.7.1
- rjieba: 0.1.11
- rsa: 4.9
- safetensors: 0.4.2
- scipy: 1.10.1
- seaborn: 0.13.2
- send2trash: 1.8.2
- sentry-sdk: 1.11.0
- setproctitle: 1.3.2
- setuptools: 59.5.0
- shortuuid: 1.0.11
- sip: 6.7.12
- six: 1.16.0
- smmap: 3.0.5
- sniffio: 1.2.0
- soupsieve: 2.5
- stack-data: 0.2.0
- sympy: 1.12
- tabulate: 0.9.0
- tensorboard: 2.16.2
- tensorboard-data-server: 0.7.2
- tensorboard-plugin-wit: 1.8.1
- tensorflow-cpu: 2.16.2
- tensorflow-io-gcs-filesystem: 0.37.0
- tensorstore: 0.1.63
- termcolor: 2.4.0
- terminado: 0.17.1
- tinycss2: 1.2.1
- tmtools: 0.2.0
- tokenizers: 0.15.2
- toml: 0.10.2
- tomli: 2.0.1
- toolz: 0.12.0
- torch: 2.1.2
- torchaudio: 2.1.2
- torchmetrics: 0.10.3
- torchvision: 0.16.2
- tornado: 6.3.3
- tqdm: 4.64.1
- trainable-folding: 0.0.0
- traitlets: 5.7.1
- transformers: 4.39.3
- triton: 2.1.0
- tunedabs: 0.0.1
- typeshed-client: 2.5.1
- typing-extensions: 4.10.0
- unicodedata2: 15.0.0
- urllib3: 1.26.11
- wandb: 0.13.5
- wcwidth: 0.2.5
- webencodings: 0.5.1
- websocket-client: 0.58.0
- werkzeug: 2.2.2
- wheel: 0.40.0
- widgetsnbextension: 4.0.5
- wrapt: 1.16.0
- yarl: 1.8.1
- zipp: 3.10.0
- System:
- OS: Linux
- architecture:
- 64bit
- ELF
- processor: x86_64
- python: 3.9.13
- release: 3.10.0-693.17.1.el7.x86_64
- version: #1 SMP Thu Jan 25 20:13:58 UTC 2018
More info
No response
I am having a similar problem. I am using lightning 2.4.0 and a LightningDataModule that wraps a custom pytorch Dataset. I have verified that my LightningDataModule, when initialized outside a distributed training run, will in fact shuffle - my DataLoader initialization in LightningDataModule.train_dataloader has shuffle=True - and I have also checked that my torch.initial_seed() is being set differently between runs and torch.backends.cudnn.deterministic and torch.backends.cudnn.benchmark are set to False. However, with Trainer accelerator='auto' and devices='auto', running on a >1 GPU slurm job, I always get the exact same order of batches.
I have a similar issue, but different from this one. I want to fix the order of my experiments, but when lighting is upgraded to >=2.0.0, the order of data loading under deepspeed is confusing, I set shuffle=false but it doesn't load sequentially from idx=0
