[WIP] Enable reproducibility for distributed trainings

docs/source/en/internal/trainer_utils.mdx

@@ -22,6 +22,8 @@ Most of those are only useful if you are studying the code of the Trainer in the
 
 [[autodoc]] IntervalStrategy
 
+[[autodoc]] enable_full_determinism
+
 [[autodoc]] set_seed
 
 [[autodoc]] torch_distributed_zero_first

src/transformers/__init__.py

@@ -372,7 +372,7 @@
         "TrainerControl",
         "TrainerState",
     ],
-    "trainer_utils": ["EvalPrediction", "IntervalStrategy", "SchedulerType", "set_seed"],
+    "trainer_utils": ["EvalPrediction", "IntervalStrategy", "SchedulerType", "enable_full_determinism", "set_seed"],
     "training_args": ["TrainingArguments"],
     "training_args_seq2seq": ["Seq2SeqTrainingArguments"],
     "training_args_tf": ["TFTrainingArguments"],
@@ -2809,7 +2809,7 @@
         TrainerControl,
         TrainerState,
     )
-    from .trainer_utils import EvalPrediction, IntervalStrategy, SchedulerType, set_seed
+    from .trainer_utils import EvalPrediction, IntervalStrategy, SchedulerType, enable_full_determinism, set_seed
     from .training_args import TrainingArguments
     from .training_args_seq2seq import Seq2SeqTrainingArguments
     from .training_args_tf import TFTrainingArguments

src/transformers/trainer.py

@@ -115,10 +115,12 @@
     default_compute_objective,
     default_hp_space,
     denumpify_detensorize,
+    enable_full_determinism,
     find_executable_batch_size,
     get_last_checkpoint,
     has_length,
     number_of_arguments,
+    seed_worker,
     set_seed,
     speed_metrics,
 )
@@ -300,7 +302,7 @@ def __init__(
             args = TrainingArguments(output_dir=output_dir)
         self.args = args
         # Seed must be set before instantiating the model when using model
-        set_seed(self.args.seed)
+        enable_full_determinism(self.args.seed) if self.args.full_determinism else set_seed(self.args.seed)
         self.hp_name = None
         self.deepspeed = None
         self.is_in_train = False
@@ -746,6 +748,7 @@ def get_train_dataloader(self) -> DataLoader:
             drop_last=self.args.dataloader_drop_last,
             num_workers=self.args.dataloader_num_workers,
             pin_memory=self.args.dataloader_pin_memory,
+            worker_init_fn=seed_worker,
         )
 
     def _get_eval_sampler(self, eval_dataset: Dataset) -> Optional[torch.utils.data.Sampler]:
@@ -1250,7 +1253,7 @@ def train(
         model_reloaded = False
         if self.model_init is not None:
             # Seed must be set before instantiating the model when using model_init.
-            set_seed(args.seed)
+            enable_full_determinism(self.args.seed) if self.args.full_determinism else set_seed(self.args.seed)
             self.model = self.call_model_init(trial)
             model_reloaded = True
             # Reinitializes optimizer and scheduler

src/transformers/trainer_tf.py

@@ -34,7 +34,14 @@
 
 from .modeling_tf_utils import TFPreTrainedModel
 from .optimization_tf import GradientAccumulator, create_optimizer
-from .trainer_utils import PREFIX_CHECKPOINT_DIR, EvalPrediction, IntervalStrategy, PredictionOutput, set_seed
+from .trainer_utils import (
+    PREFIX_CHECKPOINT_DIR,
+    EvalPrediction,
+    IntervalStrategy,
+    PredictionOutput,
+    enable_full_determinism,
+    set_seed,
+)
 from .training_args_tf import TFTrainingArguments
 from .utils import logging
 
@@ -134,7 +141,7 @@ def __init__(
                 "see https://www.comet.ml/docs/python-sdk/huggingface/"
             )
 
-        set_seed(self.args.seed)
+        enable_full_determinism(self.args.seed) if self.args.full_determinism else set_seed(self.args.seed)
 
     def get_train_tfdataset(self) -> tf.data.Dataset:
         """

src/transformers/trainer_utils.py

@@ -47,6 +47,39 @@
     import tensorflow as tf
 
 
+def seed_worker(_):
+    """
+    Helper function to set worker seed during Dataloader initialization.
+    """
+    worker_seed = torch.initial_seed() % 2**32
+    set_seed(worker_seed)
+
+
+def enable_full_determinism(seed: int):
+    """
+    Helper function for reproducible behavior during distributed training. See
+    - https://pytorch.org/docs/stable/notes/randomness.html for pytorch
+    - https://www.tensorflow.org/api_docs/python/tf/config/experimental/enable_op_determinism for tensorflow
+    """
+    # set seed first
+    set_seed(seed)
+
+    if is_torch_available():
+        #  Enable PyTorch deterministic mode. This potentially requires either the environment
+        #  variable 'CUDA_LAUNCH_BLOCKING' or 'CUBLAS_WORKSPACE_CONFIG' to be set,
+        # depending on the CUDA version, so we set them both here
+        os.environ["CUDA_LAUNCH_BLOCKING"] = "1"
+        os.environ["CUBLAS_WORKSPACE_CONFIG"] = ":16:8"
+        torch.use_deterministic_algorithms(True)
+
+        # Enable CUDNN deterministic mode
+        torch.backends.cudnn.deterministic = True
+        torch.backends.cudnn.benchmark = False
+
+    if is_tf_available():
+        tf.config.experimental.enable_op_determinism()
+
+
 def set_seed(seed: int):
     """
     Helper function for reproducible behavior to set the seed in `random`, `numpy`, `torch` and/or `tf` (if installed).

src/transformers/training_args.py

@@ -446,6 +446,9 @@ class TrainingArguments:
         auto_find_batch_size (`bool`, *optional*, defaults to `False`)
             Whether to find a batch size that will fit into memory automatically through exponential decay, avoiding
             CUDA Out-of-Memory errors. Requires accelerate to be installed (`pip install accelerate`)
+        full_determinism (`bool`, *optional*, defaults to `False`)
+            If True, enable_full_determinism is called instead of set_seed to ensure reproducible results in
+            distributed training
     """
 
     output_dir: str = field(
@@ -814,6 +817,12 @@ class TrainingArguments:
             "help": "Whether to automatically decrease the batch size in half and rerun the training loop again each time a CUDA Out-of-Memory was reached"
         },
     )
+    full_determinism: bool = field(
+        default=False,
+        metadata={
+            "help": "Whether to call enable_full_determinism instead of set_seed for reproducibility in distributed training"
+        },
+    )
 
     def __post_init__(self):
         # Handle --use_env option in torch.distributed.launch (local_rank not passed as an arg then).