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https://github.com/vale981/ray
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ea94cda1f3
This PR replaces legacy API calls to `train.` with AIR `session.` in Train code, examples and docs. Depends on https://github.com/ray-project/ray/pull/25735
153 lines
4.2 KiB
Python
153 lines
4.2 KiB
Python
# flake8: noqa
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# isort: skip_file
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# __check_ingest_1__
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import ray
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from ray.data.preprocessors import Chain, BatchMapper
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from ray.air.util.check_ingest import DummyTrainer
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# Generate a synthetic dataset of ~10GiB of float64 data. The dataset is sharded
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# into 100 blocks (parallelism=100).
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dataset = ray.data.range_tensor(50000, shape=(80, 80, 4), parallelism=100)
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# An example preprocessor chain that just scales all values by 4.0 in two stages.
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preprocessor = Chain(
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BatchMapper(lambda df: df * 2),
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BatchMapper(lambda df: df * 2),
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)
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# __check_ingest_1_end__
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# __check_ingest_2__
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# Setup the dummy trainer that prints ingest stats.
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# Run and print ingest stats.
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trainer = DummyTrainer(
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scaling_config={"num_workers": 1, "use_gpu": False},
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datasets={"train": dataset},
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preprocessor=preprocessor,
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num_epochs=1, # Stop after this number of epochs is read.
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prefetch_blocks=1, # Number of blocks to prefetch when reading data.
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batch_size=None, # Use whole blocks as batches.
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)
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trainer.fit()
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# __check_ingest_2_end__
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# __config_1__
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import ray
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from ray.train.torch import TorchTrainer
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from ray.air.config import DatasetConfig
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train_ds = ray.data.range_tensor(1000)
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valid_ds = ray.data.range_tensor(100)
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test_ds = ray.data.range_tensor(100)
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my_trainer = TorchTrainer(
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lambda: None, # No-op training loop.
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scaling_config={"num_workers": 2},
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datasets={
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"train": train_ds,
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"valid": valid_ds,
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"test": test_ds,
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},
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dataset_config={
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"valid": DatasetConfig(split=True),
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"test": DatasetConfig(split=True),
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},
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)
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print(my_trainer.get_dataset_config())
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# -> {'train': DatasetConfig(fit=True, split=True, ...),
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# 'valid': DatasetConfig(fit=False, split=True, ...),
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# 'test': DatasetConfig(fit=False, split=True, ...), ...}
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# __config_1_end__
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# __config_2__
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import ray
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from ray.train.torch import TorchTrainer
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from ray.air.config import DatasetConfig
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train_ds = ray.data.range_tensor(1000)
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side_ds = ray.data.range_tensor(10)
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my_trainer = TorchTrainer(
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lambda: None, # No-op training loop.
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scaling_config={"num_workers": 2},
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datasets={
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"train": train_ds,
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"side": side_ds,
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},
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dataset_config={
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"side": DatasetConfig(transform=False),
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},
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)
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print(my_trainer.get_dataset_config())
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# -> {'train': DatasetConfig(fit=True, split=True, ...),
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# 'side': DatasetConfig(fit=False, split=False, transform=False, ...), ...}
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# __config_2_end__
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# __config_4__
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import ray
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from ray.air import session
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from ray.data import Dataset
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from ray.train.torch import TorchTrainer
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from ray.air.config import DatasetConfig
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def train_loop_per_worker():
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# By default, bulk loading is used and returns a Dataset object.
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data_shard: Dataset = session.get_dataset_shard("train")
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# Manually iterate over the data 10 times (10 epochs).
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for _ in range(10):
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for batch in data_shard.iter_batches():
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print("Do some training on batch", batch)
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# View the stats for performance debugging.
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print(data_shard.stats())
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my_trainer = TorchTrainer(
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train_loop_per_worker,
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scaling_config={"num_workers": 1},
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datasets={
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"train": ray.data.range_tensor(1000),
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},
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)
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my_trainer.fit()
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# __config_4_end__
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# __config_5__
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import ray
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from ray.air import session
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from ray.data import DatasetPipeline
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from ray.train.torch import TorchTrainer
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from ray.air.config import DatasetConfig
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def train_loop_per_worker():
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# A DatasetPipeline object is returned when `use_stream_api` is set.
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data_shard: DatasetPipeline = session.get_dataset_shard("train")
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# Use iter_epochs(10) to iterate over 10 epochs of data.
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for epoch in data_shard.iter_epochs(10):
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for batch in epoch.iter_batches():
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print("Do some training on batch", batch)
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# View the stats for performance debugging.
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print(data_shard.stats())
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# Set N = 200 bytes for this toy example. Typically, you'd set N >= 1GiB.
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N = 200
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my_trainer = TorchTrainer(
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train_loop_per_worker,
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scaling_config={"num_workers": 1},
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datasets={
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"train": ray.data.range_tensor(1000),
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},
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dataset_config={
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"train": DatasetConfig(use_stream_api=True, stream_window_size=N),
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},
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)
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my_trainer.fit()
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# __config_5_end__
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