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OpenXExperienceReplay

class torchrl.data.datasets.OpenXExperienceReplay(dataset_id, batch_size: int | None = None, *, shuffle: bool = True, num_slices: int | None = None, slice_len: int | None = None, pad: float | bool | None = None, replacement: bool = None, streaming: bool | None = None, root: str | Path | None = None, download: bool | None = None, sampler: Sampler | None = None, writer: Writer | None = None, collate_fn: Callable | None = None, pin_memory: bool = False, prefetch: int | None = None, transform: 'torchrl.envs.Transform' | None = None, split_trajs: bool = False, strict_length: bool = True)[source]

Open X-Embodiment datasets experience replay.

The Open X-Embodiment Dataset contains 1M+ real robot trajectories spanning 22 robot embodiments, collected through a collaboration between 21 institutions, demonstrating 527 skills (160266 tasks).

Website: https://robotics-transformer-x.github.io/

GitHub: https://github.com/google-deepmind/open_x_embodiment

Paper: https://arxiv.org/abs/2310.08864

The data format follows the TED convention.

Note

Non-tensor data will be written in the tensordict data using the NonTensorData primitive. For instance, the language_instruction field in the data will be stored in data.get_non_tensor(“language_instruction”) (or equivalently data.get(“language_instruction”).data). See the documentation of this class for more information on how to interact with non-tensor data stored in a TensorDict.

Parameters:

  • dataset_id (str) – The dataset to be downloaded. Must be part of OpenXExperienceReplay.available_datasets.

  • batch_size (int) – Batch-size used during sampling. Can be overridden by data.sample(batch_size) if necessary. See num_slices and slice_len keyword arguments for a refined sampling strategy. If the batch_size is None (default), iterating over the dataset will deliver trajectories one at a time whereas calling sample() will still require a batch-size to be provided.

Keyword Arguments:

  • shuffle (bool, optional) –

    if True, trajectories are delivered in a random order when the dataset is iterated over. If False, the dataset is iterated over in the pre-defined order.

    Warning

    shuffle=False will also impact the sampling. We advice users to create a copy of the dataset where the shuffle attribute of the sampler is set to False if they wish to enjoy the two different behaviours (shuffled and not) within the same code base.

  • num_slices (int, optional) – the number of slices in a batch. This corresponds to the number of trajectories present in a batch. Once collected, the batch is presented as a concatenation of sub-trajectories that can be recovered through batch.reshape(num_slices, -1). The batch_size must be divisible by num_slices if provided. This argument is exclusive with slice_len. If the num_slices argument equates the batch_size, each sample will belong to a different trajectory. If neither slice_len nor num_slice are provided: whenever a trajectory has a length shorter than the batch-size, a contiguous slice of it of length batch_size will be sampled. If the trajectory length is insufficient, an exception will be raised unless pad is not None.

  • slice_len (int, optional) –

    the length of slices in a batch. This corresponds to the length of trajectories present in a batch. Once collected, the batch is presented as a concatenation of sub-trajectories that can be recovered through batch.reshape(-1, slice_len). The batch_size must be divisible by slice_len if provided. This argument is exclusive with num_slice. If the slice_len argument equates 1, each sample will belong to a different trajectory. If neither slice_len nor num_slice are provided: whenever a trajectory has a length shorter than the batch-size, a contiguous slice of it of length batch_size will be sampled. If the trajectory length is insufficient, an exception will be raised unless pad is not None.

    Note

    The slice_len (but not num_slices) can be used when iterating over a dataset without passing a batch-size in the, constructor. In these cases, a random sub-sequence of the trajectory will be chosen.

  • replacement (bool, optional) – if False, sampling will be done without replacement. Defaults to True for downloaded datasets, False for streamed datasets.

  • pad (bool, float or None) – if True, trajectories of insufficient length given the slice_len or num_slices arguments will be padded with 0s. If another value is provided, it will be used for padding. If False or None (default) any encounter with a trajectory of insufficient length will raise an exception.

  • root (Path or str, optional) – The OpenX dataset root directory. The actual dataset memory-mapped files will be saved under <root>/<dataset_id>. If none is provided, it defaults to ``~/.cache/torchrl/openx`.

  • streaming (bool, optional) –

    if True, the data won’t be downloaded but read from a stream instead.

    Note

    The formatting of the data __will change__ when download=True compared to streaming=True. If the data is downloaded and the sampler is left untouched (ie, num_slices=None, slice_len=None and sampler=None, transitions will be sampled randomly from the dataset. This isn’t possible at a reasonable cost with streaming=True: in this case, trajectories will be sampled one at a time and delivered as such (with cropping to comply with the batch-size etc). The behaviour of the two modalities is much more similar when num_slices and slice_len are specified, as in these cases, views of sub-episodes will be returned in both cases.

  • download (bool or str, optional) – Whether the dataset should be downloaded if not found. Defaults to True. Download can also be passed as “force”, in which case the downloaded data will be overwritten.

  • sampler (Sampler, optional) – the sampler to be used. If none is provided a default RandomSampler() will be used.

  • writer (Writer, optional) – the writer to be used. If none is provided a default ImmutableDatasetWriter will be used.

  • collate_fn (callable, optional) – merges a list of samples to form a mini-batch of Tensor(s)/outputs. Used when using batched loading from a map-style dataset.

  • pin_memory (bool) – whether pin_memory() should be called on the rb samples.

  • prefetch (int, optional) – number of next batches to be prefetched using multithreading.

  • transform (Transform, optional) – Transform to be executed when sample() is called. To chain transforms use the Compose class.

  • split_trajs (bool, optional) – if True, the trajectories will be split along the first dimension and padded to have a matching shape. To split the trajectories, the "done" signal will be used, which is recovered via done = truncated | terminated. In other words, it is assumed that any truncated or terminated signal is equivalent to the end of a trajectory. Defaults to False.

  • strict_length (bool, optional) – if False, trajectories of length shorter than slice_len (or batch_size // num_slices) will be allowed to appear in the batch. Be mindful that this can result in effective batch_size shorter than the one asked for! Trajectories can be split using torchrl.collectors.split_trajectories(). Defaults to True.

Examples

>>> from torchrl.data.datasets import OpenXExperienceReplay
>>> import tempfile
>>> # Download the data, and sample 128 elements in each batch out of two trajectories
>>> num_slices = 2
>>> with tempfile.TemporaryDirectory() as root:
...     dataset = OpenXExperienceReplay("cmu_stretch", batch_size=128,
...         num_slices=num_slices, download=True, streaming=False,
...         root=root,
...         )
...     for batch in dataset:
...         print(batch.reshape(num_slices, -1))
...         break
TensorDict(
    fields={
        action: Tensor(shape=torch.Size([2, 64, 8]), device=cpu, dtype=torch.float64, is_shared=False),
        discount: Tensor(shape=torch.Size([2, 64]), device=cpu, dtype=torch.float32, is_shared=False),
        done: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False),
        episode: Tensor(shape=torch.Size([2, 64]), device=cpu, dtype=torch.int32, is_shared=False),
        index: Tensor(shape=torch.Size([2, 64]), device=cpu, dtype=torch.int64, is_shared=False),
        is_init: Tensor(shape=torch.Size([2, 64]), device=cpu, dtype=torch.bool, is_shared=False),
        language_embedding: Tensor(shape=torch.Size([2, 64, 512]), device=cpu, dtype=torch.float64, is_shared=False),
        language_instruction: NonTensorData(
            data='lift open green garbage can lid',
            batch_size=torch.Size([2, 64]),
            device=cpu,
            is_shared=False),
        next: TensorDict(
            fields={
                done: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False),
                observation: TensorDict(
                    fields={
                        image: Tensor(shape=torch.Size([2, 64, 3, 128, 128]), device=cpu, dtype=torch.uint8, is_shared=False),
                        state: Tensor(shape=torch.Size([2, 64, 4]), device=cpu, dtype=torch.float64, is_shared=False)},
                    batch_size=torch.Size([2, 64]),
                    device=cpu,
                    is_shared=False),
                reward: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.float32, is_shared=False),
                terminated: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False),
                truncated: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False)},
            batch_size=torch.Size([2, 64]),
            device=cpu,
            is_shared=False),
        observation: TensorDict(
            fields={
                image: Tensor(shape=torch.Size([2, 64, 3, 128, 128]), device=cpu, dtype=torch.uint8, is_shared=False),
                state: Tensor(shape=torch.Size([2, 64, 4]), device=cpu, dtype=torch.float64, is_shared=False)},
            batch_size=torch.Size([2, 64]),
            device=cpu,
            is_shared=False),
        terminated: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False),
        truncated: Tensor(shape=torch.Size([2, 64, 1]), device=cpu, dtype=torch.bool, is_shared=False)},
    batch_size=torch.Size([2, 64]),
    device=cpu,
    is_shared=False)
>>> # Read data from a stream. Deliver entire trajectories when iterating
>>> dataset = OpenXExperienceReplay("cmu_stretch",
...     num_slices=num_slices, download=False, streaming=True)
>>> for data in dataset: # data does not have a consistent shape
...     break
>>> # Define batch-size dynamically
>>> data = dataset.sample(128)  # delivers 2 sub-trajectories of length 64
add(data: TensorDictBase) → int

Add a single element to the replay buffer.

Parameters:

data (Any) – data to be added to the replay buffer

Returns:

index where the data lives in the replay buffer.

append_transform(transform: Transform, *, invert: bool = False) → ReplayBuffer

Appends transform at the end.

Transforms are applied in order when sample is called.

Parameters:

transform (Transform) – The transform to be appended

Keyword Arguments:

invert (bool, optional) – if True, the transform will be inverted (forward calls will be called during writing and inverse calls during reading). Defaults to False.

Example

>>> rb = ReplayBuffer(storage=LazyMemmapStorage(10), batch_size=4)
>>> data = TensorDict({"a": torch.zeros(10)}, [10])
>>> def t(data):
...     data += 1
...     return data
>>> rb.append_transform(t, invert=True)
>>> rb.extend(data)
>>> assert (data == 1).all()
property data_path

Path to the dataset, including split.

property data_path_root

Path to the dataset root.

delete()

Deletes a dataset storage from disk.

dump(*args, **kwargs)

Alias for dumps().

dumps(path)

Saves the replay buffer on disk at the specified path.

Parameters:

path (Path or str) – path where to save the replay buffer.

Examples

>>> import tempfile
>>> import tqdm
>>> from torchrl.data import LazyMemmapStorage, TensorDictReplayBuffer
>>> from torchrl.data.replay_buffers.samplers import PrioritizedSampler, RandomSampler
>>> import torch
>>> from tensordict import TensorDict
>>> # Build and populate the replay buffer
>>> S = 1_000_000
>>> sampler = PrioritizedSampler(S, 1.1, 1.0)
>>> # sampler = RandomSampler()
>>> storage = LazyMemmapStorage(S)
>>> rb = TensorDictReplayBuffer(storage=storage, sampler=sampler)
>>>
>>> for _ in tqdm.tqdm(range(100)):
...     td = TensorDict({"obs": torch.randn(100, 3, 4), "next": {"obs": torch.randn(100, 3, 4)}, "td_error": torch.rand(100)}, [100])
...     rb.extend(td)
...     sample = rb.sample(32)
...     rb.update_tensordict_priority(sample)
>>> # save and load the buffer
>>> with tempfile.TemporaryDirectory() as tmpdir:
...     rb.dumps(tmpdir)
...
...     sampler = PrioritizedSampler(S, 1.1, 1.0)
...     # sampler = RandomSampler()
...     storage = LazyMemmapStorage(S)
...     rb_load = TensorDictReplayBuffer(storage=storage, sampler=sampler)
...     rb_load.loads(tmpdir)
...     assert len(rb) == len(rb_load)
empty()

Empties the replay buffer and reset cursor to 0.

extend(tensordicts: TensorDictBase) → Tensor

Extends the replay buffer with one or more elements contained in an iterable.

If present, the inverse transforms will be called.`

Parameters:

data (iterable) – collection of data to be added to the replay buffer.

Returns:

Indices of the data added to the replay buffer.

Warning

extend() can have an ambiguous signature when dealing with lists of values, which should be interpreted either as PyTree (in which case all elements in the list will be put in a slice in the stored PyTree in the storage) or a list of values to add one at a time. To solve this, TorchRL makes the clear-cut distinction between list and tuple: a tuple will be viewed as a PyTree, a list (at the root level) will be interpreted as a stack of values to add one at a time to the buffer. For ListStorage instances, only unbound elements can be provided (no PyTrees).

insert_transform(index: int, transform: Transform, *, invert: bool = False) → ReplayBuffer

Inserts transform.

Transforms are executed in order when sample is called.

Parameters:

  • index (int) – Position to insert the transform.

  • transform (Transform) – The transform to be appended

Keyword Arguments:

invert (bool, optional) – if True, the transform will be inverted (forward calls will be called during writing and inverse calls during reading). Defaults to False.

load(*args, **kwargs)

Alias for loads().

loads(path)

Loads a replay buffer state at the given path.

The buffer should have matching components and be saved using dumps().

Parameters:

path (Path or str) – path where the replay buffer was saved.

See dumps() for more info.

preprocess(fn: Callable[[TensorDictBase], TensorDictBase], dim: int = 0, num_workers: int | None = None, *, chunksize: int | None = None, num_chunks: int | None = None, pool: mp.Pool | None = None, generator: torch.Generator | None = None, max_tasks_per_child: int | None = None, worker_threads: int = 1, index_with_generator: bool = False, pbar: bool = False, mp_start_method: str | None = None, num_frames: int | None = None, dest: str | Path) → TensorStorage

Preprocesses a dataset and returns a new storage with the formatted data.

The data transform must be unitary (work on a single sample of the dataset).

Args and Keyword Args are forwarded to map().

The dataset can subsequently be deleted using delete().

Keyword Arguments:

  • dest (path or equivalent) – a path to the location of the new dataset.

  • num_frames (int, optional) – if provided, only the first num_frames will be transformed. This is useful to debug the transform at first.

Returns: A new storage to be used within a ReplayBuffer instance.

Examples

>>> from torchrl.data.datasets import MinariExperienceReplay
>>>
>>> data = MinariExperienceReplay(
...     list(MinariExperienceReplay.available_datasets)[0],
...     batch_size=32
...     )
>>> print(data)
MinariExperienceReplay(
    storages=TensorStorage(TensorDict(
        fields={
            action: MemoryMappedTensor(shape=torch.Size([1000000, 8]), device=cpu, dtype=torch.float32, is_shared=True),
            episode: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.int64, is_shared=True),
            info: TensorDict(
                fields={
                    distance_from_origin: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    forward_reward: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                    qpos: MemoryMappedTensor(shape=torch.Size([1000000, 15]), device=cpu, dtype=torch.float64, is_shared=True),
                    qvel: MemoryMappedTensor(shape=torch.Size([1000000, 14]), device=cpu, dtype=torch.float64, is_shared=True),
                    reward_ctrl: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    reward_forward: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    reward_survive: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    success: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.bool, is_shared=True),
                    x_position: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    x_velocity: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    y_position: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                    y_velocity: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True)},
                batch_size=torch.Size([1000000]),
                device=cpu,
                is_shared=False),
            next: TensorDict(
                fields={
                    done: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True),
                    info: TensorDict(
                        fields={
                            distance_from_origin: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            forward_reward: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                            qpos: MemoryMappedTensor(shape=torch.Size([1000000, 15]), device=cpu, dtype=torch.float64, is_shared=True),
                            qvel: MemoryMappedTensor(shape=torch.Size([1000000, 14]), device=cpu, dtype=torch.float64, is_shared=True),
                            reward_ctrl: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            reward_forward: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            reward_survive: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            success: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.bool, is_shared=True),
                            x_position: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            x_velocity: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            y_position: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True),
                            y_velocity: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.float64, is_shared=True)},
                        batch_size=torch.Size([1000000]),
                        device=cpu,
                        is_shared=False),
                    observation: TensorDict(
                        fields={
                            achieved_goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                            desired_goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                            observation: MemoryMappedTensor(shape=torch.Size([1000000, 27]), device=cpu, dtype=torch.float64, is_shared=True)},
                        batch_size=torch.Size([1000000]),
                        device=cpu,
                        is_shared=False),
                    reward: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.float64, is_shared=True),
                    terminated: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True),
                    truncated: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True)},
                batch_size=torch.Size([1000000]),
                device=cpu,
                is_shared=False),
            observation: TensorDict(
                fields={
                    achieved_goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                    desired_goal: MemoryMappedTensor(shape=torch.Size([1000000, 2]), device=cpu, dtype=torch.float64, is_shared=True),
                    observation: MemoryMappedTensor(shape=torch.Size([1000000, 27]), device=cpu, dtype=torch.float64, is_shared=True)},
                batch_size=torch.Size([1000000]),
                device=cpu,
                is_shared=False)},
        batch_size=torch.Size([1000000]),
        device=cpu,
        is_shared=False)),
    samplers=RandomSampler,
    writers=ImmutableDatasetWriter(),
batch_size=32,
transform=Compose(
),
collate_fn=<function _collate_id at 0x120e21dc0>)
>>> from torchrl.envs import CatTensors, Compose
>>> from tempfile import TemporaryDirectory
>>>
>>> cat_tensors = CatTensors(
...     in_keys=[("observation", "observation"), ("observation", "achieved_goal"),
...              ("observation", "desired_goal")],
...     out_key="obs"
...     )
>>> cat_next_tensors = CatTensors(
...     in_keys=[("next", "observation", "observation"),
...              ("next", "observation", "achieved_goal"),
...              ("next", "observation", "desired_goal")],
...     out_key=("next", "obs")
...     )
>>> t = Compose(cat_tensors, cat_next_tensors)
>>>
>>> def func(td):
...     td = td.select(
...         "action",
...         "episode",
...         ("next", "done"),
...         ("next", "observation"),
...         ("next", "reward"),
...         ("next", "terminated"),
...         ("next", "truncated"),
...         "observation"
...         )
...     td = t(td)
...     return td
>>> with TemporaryDirectory() as tmpdir:
...     new_storage = data.preprocess(func, num_workers=4, pbar=True, mp_start_method="fork", dest=tmpdir)
...     rb = ReplayBuffer(storage=new_storage)
...     print(rb)
ReplayBuffer(
    storage=TensorStorage(
        data=TensorDict(
            fields={
                action: MemoryMappedTensor(shape=torch.Size([1000000, 8]), device=cpu, dtype=torch.float32, is_shared=True),
                episode: MemoryMappedTensor(shape=torch.Size([1000000]), device=cpu, dtype=torch.int64, is_shared=True),
                next: TensorDict(
                    fields={
                        done: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True),
                        obs: MemoryMappedTensor(shape=torch.Size([1000000, 31]), device=cpu, dtype=torch.float64, is_shared=True),
                        observation: TensorDict(
                            fields={
                            },
                            batch_size=torch.Size([1000000]),
                            device=cpu,
                            is_shared=False),
                        reward: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.float64, is_shared=True),
                        terminated: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True),
                        truncated: MemoryMappedTensor(shape=torch.Size([1000000, 1]), device=cpu, dtype=torch.bool, is_shared=True)},
                    batch_size=torch.Size([1000000]),
                    device=cpu,
                    is_shared=False),
                obs: MemoryMappedTensor(shape=torch.Size([1000000, 31]), device=cpu, dtype=torch.float64, is_shared=True),
                observation: TensorDict(
                    fields={
                    },
                    batch_size=torch.Size([1000000]),
                    device=cpu,
                    is_shared=False)},
            batch_size=torch.Size([1000000]),
            device=cpu,
            is_shared=False),
        shape=torch.Size([1000000]),
        len=1000000,
        max_size=1000000),
    sampler=RandomSampler(),
    writer=RoundRobinWriter(cursor=0, full_storage=True),
    batch_size=None,
    collate_fn=<function _collate_id at 0x168406fc0>)
register_load_hook(hook: Callable[[Any], Any])

Registers a load hook for the storage.

Note

Hooks are currently not serialized when saving a replay buffer: they must be manually re-initialized every time the buffer is created.

register_save_hook(hook: Callable[[Any], Any])

Registers a save hook for the storage.

Note

Hooks are currently not serialized when saving a replay buffer: they must be manually re-initialized every time the buffer is created.

sample(batch_size: int | None = None, return_info: bool = False, include_info: bool = None) → TensorDictBase

Samples a batch of data from the replay buffer.

Uses Sampler to sample indices, and retrieves them from Storage.

Parameters:

  • batch_size (int, optional) – size of data to be collected. If none is provided, this method will sample a batch-size as indicated by the sampler.

  • return_info (bool) – whether to return info. If True, the result is a tuple (data, info). If False, the result is the data.

Returns:

A tensordict containing a batch of data selected in the replay buffer. A tuple containing this tensordict and info if return_info flag is set to True.

property sampler

The sampler of the replay buffer.

The sampler must be an instance of Sampler.

save(*args, **kwargs)

Alias for dumps().

set_sampler(sampler: Sampler)

Sets a new sampler in the replay buffer and returns the previous sampler.

set_storage(storage: Storage, collate_fn: Callable | None = None)

Sets a new storage in the replay buffer and returns the previous storage.

Parameters:

  • storage (Storage) – the new storage for the buffer.

  • collate_fn (callable, optional) – if provided, the collate_fn is set to this value. Otherwise it is reset to a default value.

set_writer(writer: Writer)

Sets a new writer in the replay buffer and returns the previous writer.

property storage

The storage of the replay buffer.

The storage must be an instance of Storage.

property writer

The writer of the replay buffer.

The writer must be an instance of Writer.

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