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_data_splitting.py
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_data_splitting.py
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from math import ceil, floor
from typing import Dict, List, Optional, Union
import lightning.pytorch as pl
import numpy as np
import torch
from torch.utils.data import (
BatchSampler,
DataLoader,
Dataset,
RandomSampler,
SequentialSampler,
)
from scvi import REGISTRY_KEYS, settings
from scvi.data import AnnDataManager
from scvi.data._utils import get_anndata_attribute
from scvi.dataloaders._ann_dataloader import AnnDataLoader
from scvi.dataloaders._semi_dataloader import SemiSupervisedDataLoader
from scvi.model._utils import parse_device_args
from scvi.utils._docstrings import devices_dsp
def validate_data_split(
n_samples: int, train_size: float, validation_size: Optional[float] = None
):
"""Check data splitting parameters and return n_train and n_val.
Parameters
----------
n_samples
Number of samples to split
train_size
Size of train set. Need to be: 0 < train_size <= 1.
validation_size
Size of validation set. Need to be 0 <= validation_size < 1
"""
if train_size > 1.0 or train_size <= 0.0:
raise ValueError("Invalid train_size. Must be: 0 < train_size <= 1")
n_train = ceil(train_size * n_samples)
if validation_size is None:
n_val = n_samples - n_train
elif validation_size >= 1.0 or validation_size < 0.0:
raise ValueError("Invalid validation_size. Must be 0 <= validation_size < 1")
elif (train_size + validation_size) > 1:
raise ValueError("train_size + validation_size must be between 0 and 1")
else:
n_val = floor(n_samples * validation_size)
if n_train == 0:
raise ValueError(
"With n_samples={}, train_size={} and validation_size={}, the "
"resulting train set will be empty. Adjust any of the "
"aforementioned parameters.".format(n_samples, train_size, validation_size)
)
return n_train, n_val
class DataSplitter(pl.LightningDataModule):
"""Creates data loaders ``train_set``, ``validation_set``, ``test_set``.
If ``train_size + validation_set < 1`` then ``test_set`` is non-empty.
Parameters
----------
adata_manager
:class:`~scvi.data.AnnDataManager` object that has been created via ``setup_anndata``.
train_size
float, or None (default is 0.9)
validation_size
float, or None (default is None)
shuffle_set_split
Whether to shuffle indices before splitting. If `False`, the val, train, and test set are split in the
sequential order of the data according to `validation_size` and `train_size` percentages.
pin_memory
Whether to copy tensors into device-pinned memory before returning them. Passed
into :class:`~scvi.data.AnnDataLoader`.
**kwargs
Keyword args for data loader. If adata has labeled data, data loader
class is :class:`~scvi.dataloaders.SemiSupervisedDataLoader`,
else data loader class is :class:`~scvi.dataloaders.AnnDataLoader`.
Examples
--------
>>> adata = scvi.data.synthetic_iid()
>>> scvi.model.SCVI.setup_anndata(adata)
>>> adata_manager = scvi.model.SCVI(adata).adata_manager
>>> splitter = DataSplitter(adata)
>>> splitter.setup()
>>> train_dl = splitter.train_dataloader()
"""
data_loader_cls = AnnDataLoader
def __init__(
self,
adata_manager: AnnDataManager,
train_size: float = 0.9,
validation_size: Optional[float] = None,
shuffle_set_split: bool = True,
pin_memory: bool = False,
**kwargs,
):
super().__init__()
self.adata_manager = adata_manager
self.train_size = float(train_size)
self.validation_size = validation_size
self.shuffle_set_split = shuffle_set_split
self.data_loader_kwargs = kwargs
self.pin_memory = pin_memory or settings.dl_pin_memory_gpu_training
self.n_train, self.n_val = validate_data_split(
self.adata_manager.adata.n_obs, self.train_size, self.validation_size
)
def setup(self, stage: Optional[str] = None):
"""Split indices in train/test/val sets."""
n_train = self.n_train
n_val = self.n_val
indices = np.arange(self.adata_manager.adata.n_obs)
if self.shuffle_set_split:
random_state = np.random.RandomState(seed=settings.seed)
indices = random_state.permutation(indices)
self.val_idx = indices[:n_val]
self.train_idx = indices[n_val : (n_val + n_train)]
self.test_idx = indices[(n_val + n_train) :]
def train_dataloader(self):
"""Create train data loader."""
return self.data_loader_cls(
self.adata_manager,
indices=self.train_idx,
shuffle=True,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
def val_dataloader(self):
"""Create validation data loader."""
if len(self.val_idx) > 0:
return self.data_loader_cls(
self.adata_manager,
indices=self.val_idx,
shuffle=False,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
else:
pass
def test_dataloader(self):
"""Create test data loader."""
if len(self.test_idx) > 0:
return self.data_loader_cls(
self.adata_manager,
indices=self.test_idx,
shuffle=False,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
else:
pass
class SemiSupervisedDataSplitter(pl.LightningDataModule):
"""Creates data loaders ``train_set``, ``validation_set``, ``test_set``.
If ``train_size + validation_set < 1`` then ``test_set`` is non-empty.
The ratio between labeled and unlabeled data in adata will be preserved
in the train/test/val sets.
Parameters
----------
adata_manager
:class:`~scvi.data.AnnDataManager` object that has been created via ``setup_anndata``.
train_size
float, or None (default is 0.9)
validation_size
float, or None (default is None)
shuffle_set_split
Whether to shuffle indices before splitting. If `False`, the val, train, and test set are split in the
sequential order of the data according to `validation_size` and `train_size` percentages.
n_samples_per_label
Number of subsamples for each label class to sample per epoch
pin_memory
Whether to copy tensors into device-pinned memory before returning them. Passed
into :class:`~scvi.data.AnnDataLoader`.
**kwargs
Keyword args for data loader. If adata has labeled data, data loader
class is :class:`~scvi.dataloaders.SemiSupervisedDataLoader`,
else data loader class is :class:`~scvi.dataloaders.AnnDataLoader`.
Examples
--------
>>> adata = scvi.data.synthetic_iid()
>>> scvi.model.SCVI.setup_anndata(adata, labels_key="labels")
>>> adata_manager = scvi.model.SCVI(adata).adata_manager
>>> unknown_label = 'label_0'
>>> splitter = SemiSupervisedDataSplitter(adata, unknown_label)
>>> splitter.setup()
>>> train_dl = splitter.train_dataloader()
"""
def __init__(
self,
adata_manager: AnnDataManager,
train_size: float = 0.9,
validation_size: Optional[float] = None,
shuffle_set_split: bool = True,
n_samples_per_label: Optional[int] = None,
pin_memory: bool = False,
**kwargs,
):
super().__init__()
self.adata_manager = adata_manager
self.train_size = float(train_size)
self.validation_size = validation_size
self.shuffle_set_split = shuffle_set_split
self.data_loader_kwargs = kwargs
self.n_samples_per_label = n_samples_per_label
labels_state_registry = adata_manager.get_state_registry(
REGISTRY_KEYS.LABELS_KEY
)
labels = get_anndata_attribute(
adata_manager.adata,
adata_manager.data_registry.labels.attr_name,
labels_state_registry.original_key,
).ravel()
self.unlabeled_category = labels_state_registry.unlabeled_category
self._unlabeled_indices = np.argwhere(labels == self.unlabeled_category).ravel()
self._labeled_indices = np.argwhere(labels != self.unlabeled_category).ravel()
self.data_loader_kwargs = kwargs
self.pin_memory = pin_memory or settings.dl_pin_memory_gpu_training
def setup(self, stage: Optional[str] = None):
"""Split indices in train/test/val sets."""
n_labeled_idx = len(self._labeled_indices)
n_unlabeled_idx = len(self._unlabeled_indices)
if n_labeled_idx != 0:
n_labeled_train, n_labeled_val = validate_data_split(
n_labeled_idx, self.train_size, self.validation_size
)
labeled_permutation = self._labeled_indices
if self.shuffle_set_split:
rs = np.random.RandomState(seed=settings.seed)
labeled_permutation = rs.choice(
self._labeled_indices, len(self._labeled_indices), replace=False
)
labeled_idx_val = labeled_permutation[:n_labeled_val]
labeled_idx_train = labeled_permutation[
n_labeled_val : (n_labeled_val + n_labeled_train)
]
labeled_idx_test = labeled_permutation[(n_labeled_val + n_labeled_train) :]
else:
labeled_idx_test = []
labeled_idx_train = []
labeled_idx_val = []
if n_unlabeled_idx != 0:
n_unlabeled_train, n_unlabeled_val = validate_data_split(
n_unlabeled_idx, self.train_size, self.validation_size
)
unlabeled_permutation = self._unlabeled_indices
if self.shuffle_set_split:
rs = np.random.RandomState(seed=settings.seed)
unlabeled_permutation = rs.choice(
self._unlabeled_indices, len(self._unlabeled_indices)
)
unlabeled_idx_val = unlabeled_permutation[:n_unlabeled_val]
unlabeled_idx_train = unlabeled_permutation[
n_unlabeled_val : (n_unlabeled_val + n_unlabeled_train)
]
unlabeled_idx_test = unlabeled_permutation[
(n_unlabeled_val + n_unlabeled_train) :
]
else:
unlabeled_idx_train = []
unlabeled_idx_val = []
unlabeled_idx_test = []
indices_train = np.concatenate((labeled_idx_train, unlabeled_idx_train))
indices_val = np.concatenate((labeled_idx_val, unlabeled_idx_val))
indices_test = np.concatenate((labeled_idx_test, unlabeled_idx_test))
self.train_idx = indices_train.astype(int)
self.val_idx = indices_val.astype(int)
self.test_idx = indices_test.astype(int)
if len(self._labeled_indices) != 0:
self.data_loader_class = SemiSupervisedDataLoader
dl_kwargs = {
"n_samples_per_label": self.n_samples_per_label,
}
else:
self.data_loader_class = AnnDataLoader
dl_kwargs = {}
self.data_loader_kwargs.update(dl_kwargs)
def train_dataloader(self):
"""Create the train data loader."""
return self.data_loader_class(
self.adata_manager,
indices=self.train_idx,
shuffle=True,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
def val_dataloader(self):
"""Create the validation data loader."""
if len(self.val_idx) > 0:
return self.data_loader_class(
self.adata_manager,
indices=self.val_idx,
shuffle=False,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
else:
pass
def test_dataloader(self):
"""Create the test data loader."""
if len(self.test_idx) > 0:
return self.data_loader_class(
self.adata_manager,
indices=self.test_idx,
shuffle=False,
drop_last=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
else:
pass
@devices_dsp.dedent
class DeviceBackedDataSplitter(DataSplitter):
"""Creates loaders for data that is already on device, e.g., GPU.
If ``train_size + validation_set < 1`` then ``test_set`` is non-empty.
Parameters
----------
adata_manager
:class:`~scvi.data.AnnDataManager` object that has been created via ``setup_anndata``.
train_size
float, or None (default is 0.9)
validation_size
float, or None (default is None)
%(param_accelerator)s
%(param_device)s
pin_memory
Whether to copy tensors into device-pinned memory before returning them. Passed
into :class:`~scvi.data.AnnDataLoader`.
shuffle
if ``True``, shuffles indices before sampling for training set
shuffle_test_val
Shuffle test and validation indices.
batch_size
batch size of each iteration. If `None`, do not minibatch
Examples
--------
>>> adata = scvi.data.synthetic_iid()
>>> scvi.model.SCVI.setup_anndata(adata)
>>> adata_manager = scvi.model.SCVI(adata).adata_manager
>>> splitter = DeviceBackedDataSplitter(adata)
>>> splitter.setup()
>>> train_dl = splitter.train_dataloader()
"""
def __init__(
self,
adata_manager: AnnDataManager,
train_size: float = 1.0,
validation_size: Optional[float] = None,
accelerator: str = "auto",
device: Union[int, str] = "auto",
pin_memory: bool = False,
shuffle: bool = False,
shuffle_test_val: bool = False,
batch_size: Optional[int] = None,
**kwargs,
):
super().__init__(
adata_manager=adata_manager,
train_size=train_size,
validation_size=validation_size,
pin_memory=pin_memory,
**kwargs,
)
self.batch_size = batch_size
self.shuffle = shuffle
self.shuffle_test_val = shuffle_test_val
_, _, self.device = parse_device_args(
accelerator=accelerator, devices=device, return_device="torch"
)
def setup(self, stage: Optional[str] = None):
"""Create the train, validation, and test indices."""
super().setup()
if self.shuffle is False:
self.train_idx = np.sort(self.train_idx)
self.val_idx = (
np.sort(self.val_idx) if len(self.val_idx) > 0 else self.val_idx
)
self.test_idx = (
np.sort(self.test_idx) if len(self.test_idx) > 0 else self.test_idx
)
self.train_tensor_dict = self._get_tensor_dict(
self.train_idx, device=self.device
)
self.test_tensor_dict = self._get_tensor_dict(self.test_idx, device=self.device)
self.val_tensor_dict = self._get_tensor_dict(self.val_idx, device=self.device)
def _get_tensor_dict(self, indices, device):
"""Get tensor dict for a given set of indices."""
if len(indices) is not None and len(indices) > 0:
dl = AnnDataLoader(
self.adata_manager,
indices=indices,
batch_size=len(indices),
shuffle=False,
pin_memory=self.pin_memory,
**self.data_loader_kwargs,
)
# will only have one minibatch
for batch in dl:
tensor_dict = batch
for k, v in tensor_dict.items():
tensor_dict[k] = v.to(device)
return tensor_dict
else:
return None
def _make_dataloader(self, tensor_dict: Dict[str, torch.Tensor], shuffle):
"""Create a dataloader from a tensor dict."""
if tensor_dict is None:
return None
dataset = _DeviceBackedDataset(tensor_dict)
bs = self.batch_size if self.batch_size is not None else len(dataset)
sampler_cls = SequentialSampler if not shuffle else RandomSampler
sampler = BatchSampler(
sampler=sampler_cls(dataset),
batch_size=bs,
drop_last=False,
)
return DataLoader(dataset, sampler=sampler, batch_size=None)
def train_dataloader(self):
"""Create the train data loader."""
return self._make_dataloader(self.train_tensor_dict, self.shuffle)
def test_dataloader(self):
"""Create the test data loader."""
return self._make_dataloader(self.test_tensor_dict, self.shuffle_test_val)
def val_dataloader(self):
"""Create the validation data loader."""
return self._make_dataloader(self.val_tensor_dict, self.shuffle_test_val)
class _DeviceBackedDataset(Dataset):
def __init__(self, tensor_dict: Dict[str, torch.Tensor]):
self.data = tensor_dict
def __getitem__(self, idx: List[int]) -> Dict[str, torch.Tensor]:
return_dict = {}
for key, value in self.data.items():
return_dict[key] = value[idx]
return return_dict
def __len__(self):
for _, value in self.data.items():
return len(value)