import re
import collections.abc as cabc
from functools import _find_impl, partial
from warnings import warn
from pathlib import Path
from types import MappingProxyType
from typing import Callable, Type, TypeVar, Union
from typing import Collection, Sequence, Mapping
import h5py
import numpy as np
import pandas as pd
from pandas.api.types import is_categorical_dtype
from scipy import sparse
from .._core.sparse_dataset import SparseDataset
from .._core.file_backing import AnnDataFileManager
from .._core.anndata import AnnData
from .._core.raw import Raw
from ..compat import _from_fixed_length_strings, _clean_uns, Literal
from .utils import (
report_read_key_on_error,
report_write_key_on_error,
idx_chunks_along_axis,
write_attribute,
read_attribute,
_read_legacy_raw,
EncodingVersions,
)
H5Group = Union[h5py.Group, h5py.File]
H5Dataset = Union[h5py.Dataset]
T = TypeVar("T")
def _to_hdf5_vlen_strings(value: np.ndarray) -> np.ndarray:
"""This corrects compound dtypes to work with hdf5 files."""
new_dtype = []
for dt_name, (dt_type, _) in value.dtype.fields.items():
if dt_type.kind in ("U", "O"):
new_dtype.append((dt_name, h5py.special_dtype(vlen=str)))
else:
new_dtype.append((dt_name, dt_type))
return value.astype(new_dtype)
def write_h5ad(
filepath: Union[Path, str],
adata: AnnData,
*,
force_dense: bool = None,
as_dense: Sequence[str] = (),
dataset_kwargs: Mapping = MappingProxyType({}),
**kwargs,
) -> None:
if force_dense is not None:
warn(
"The `force_dense` argument is deprecated. Use `as_dense` instead.",
FutureWarning,
)
if force_dense is True:
if adata.raw is not None:
as_dense = ("X", "raw/X")
else:
as_dense = ("X",)
if isinstance(as_dense, str):
as_dense = [as_dense]
if "raw.X" in as_dense:
as_dense = list(as_dense)
as_dense[as_dense.index("raw.X")] = "raw/X"
if any(val not in {"X", "raw/X"} for val in as_dense):
raise NotImplementedError(
"Currently, only `X` and `raw/X` are supported values in `as_dense`"
)
if "raw/X" in as_dense and adata.raw is None:
raise ValueError("Cannot specify writing `raw/X` to dense if it doesn’t exist.")
adata.strings_to_categoricals()
if adata.raw is not None:
adata.strings_to_categoricals(adata.raw.var)
dataset_kwargs = {**dataset_kwargs, **kwargs}
filepath = Path(filepath)
mode = "a" if adata.isbacked else "w"
if adata.isbacked: # close so that we can reopen below
adata.file.close()
with h5py.File(filepath, mode) as f:
if "X" in as_dense and isinstance(adata.X, (sparse.spmatrix, SparseDataset)):
write_sparse_as_dense(f, "X", adata.X, dataset_kwargs=dataset_kwargs)
elif not (adata.isbacked and Path(adata.filename) == Path(filepath)):
# If adata.isbacked, X should already be up to date
write_attribute(f, "X", adata.X, dataset_kwargs=dataset_kwargs)
if "raw/X" in as_dense and isinstance(
adata.raw.X, (sparse.spmatrix, SparseDataset)
):
write_sparse_as_dense(
f, "raw/X", adata.raw.X, dataset_kwargs=dataset_kwargs
)
write_attribute(f, "raw/var", adata.raw.var, dataset_kwargs=dataset_kwargs)
write_attribute(
f, "raw/varm", adata.raw.varm, dataset_kwargs=dataset_kwargs
)
else:
write_attribute(f, "raw", adata.raw, dataset_kwargs=dataset_kwargs)
write_attribute(f, "obs", adata.obs, dataset_kwargs=dataset_kwargs)
write_attribute(f, "var", adata.var, dataset_kwargs=dataset_kwargs)
write_attribute(f, "obsm", adata.obsm, dataset_kwargs=dataset_kwargs)
write_attribute(f, "varm", adata.varm, dataset_kwargs=dataset_kwargs)
write_attribute(f, "obsp", adata.obsp, dataset_kwargs=dataset_kwargs)
write_attribute(f, "varp", adata.varp, dataset_kwargs=dataset_kwargs)
write_attribute(f, "layers", adata.layers, dataset_kwargs=dataset_kwargs)
write_attribute(f, "uns", adata.uns, dataset_kwargs=dataset_kwargs)
if adata.isbacked:
adata.file.open(filepath, "r+")
def _write_method(cls: Type[T]) -> Callable[[H5Group, str, T], None]:
return _find_impl(cls, H5AD_WRITE_REGISTRY)
@write_attribute.register(h5py.File)
@write_attribute.register(h5py.Group)
def write_attribute_h5ad(f: H5Group, key: str, value, *args, **kwargs):
if key in f:
del f[key]
_write_method(type(value))(f, key, value, *args, **kwargs)
def write_raw(f, key, value, dataset_kwargs=MappingProxyType({})):
group = f.create_group(key)
group.attrs["encoding-type"] = "raw"
group.attrs["encoding-version"] = EncodingVersions.raw.value
group.attrs["shape"] = value.shape
write_attribute(f, "raw/X", value.X, dataset_kwargs=dataset_kwargs)
write_attribute(f, "raw/var", value.var, dataset_kwargs=dataset_kwargs)
write_attribute(f, "raw/varm", value.varm, dataset_kwargs=dataset_kwargs)
@report_write_key_on_error
def write_not_implemented(f, key, value, dataset_kwargs=MappingProxyType({})):
# If it’s not an array, try and make it an array. If that fails, pickle it.
# Maybe rethink that, maybe this should just pickle,
# and have explicit implementations for everything else
raise NotImplementedError(
f"Failed to write value for {key}, "
f"since a writer for type {type(value)} has not been implemented yet."
)
@report_write_key_on_error
def write_basic(f, key, value, dataset_kwargs=MappingProxyType({})):
f.create_dataset(key, data=value, **dataset_kwargs)
@report_write_key_on_error
def write_list(f, key, value, dataset_kwargs=MappingProxyType({})):
write_array(f, key, np.array(value), dataset_kwargs=dataset_kwargs)
@report_write_key_on_error
def write_none(f, key, value, dataset_kwargs=MappingProxyType({})):
pass
@report_write_key_on_error
def write_scalar(f, key, value, dataset_kwargs=MappingProxyType({})):
# Can’t compress scalars, error is thrown
if "compression" in dataset_kwargs:
dataset_kwargs = dict(dataset_kwargs)
dataset_kwargs.pop("compression")
write_array(f, key, np.array(value), dataset_kwargs=dataset_kwargs)
@report_write_key_on_error
def write_array(f, key, value, dataset_kwargs=MappingProxyType({})):
# Convert unicode to fixed length strings
if value.dtype.kind in {"U", "O"}:
value = value.astype(h5py.special_dtype(vlen=str))
elif value.dtype.names is not None:
value = _to_hdf5_vlen_strings(value)
f.create_dataset(key, data=value, **dataset_kwargs)
@report_write_key_on_error
def write_sparse_compressed(
f, key, value, fmt: Literal["csr", "csc"], dataset_kwargs=MappingProxyType({})
):
g = f.create_group(key)
g.attrs["encoding-type"] = f"{fmt}_matrix"
g.attrs["encoding-version"] = EncodingVersions[f"{fmt}_matrix"].value
g.attrs["shape"] = value.shape
# Allow resizing
if "maxshape" not in dataset_kwargs:
dataset_kwargs = dict(maxshape=(None,), **dataset_kwargs)
g.create_dataset("data", data=value.data, **dataset_kwargs)
g.create_dataset("indices", data=value.indices, **dataset_kwargs)
g.create_dataset("indptr", data=value.indptr, **dataset_kwargs)
write_csr = partial(write_sparse_compressed, fmt="csr")
write_csc = partial(write_sparse_compressed, fmt="csc")
@report_write_key_on_error
def write_sparse_dataset(f, key, value, dataset_kwargs=MappingProxyType({})):
write_sparse_compressed(
f, key, value.to_backed(), fmt=value.format_str, dataset_kwargs=dataset_kwargs,
)
@report_write_key_on_error
def write_sparse_as_dense(f, key, value, dataset_kwargs=MappingProxyType({})):
real_key = None # Flag for if temporary key was used
if key in f:
if (
isinstance(value, (h5py.Group, h5py.Dataset, SparseDataset))
and value.file.filename == f.filename
): # Write to temporary key before overwriting
real_key = key
# Transform key to temporary, e.g. raw/X -> raw/_X, or X -> _X
key = re.sub(r"(.*)(\w(?!.*/))", r"\1_\2", key.rstrip("/"))
else:
del f[key] # Wipe before write
dset = f.create_dataset(key, shape=value.shape, dtype=value.dtype, **dataset_kwargs)
compressed_axis = int(isinstance(value, sparse.csc_matrix))
for idx in idx_chunks_along_axis(value.shape, compressed_axis, 1000):
dset[idx] = value[idx].toarray()
if real_key is not None:
del f[real_key]
f[real_key] = f[key]
del f[key]
@report_write_key_on_error
def write_dataframe(f, key, df, dataset_kwargs=MappingProxyType({})):
# Check arguments
for reserved in ("__categories", "_index"):
if reserved in df.columns:
raise ValueError(f"{reserved!r} is a reserved name for dataframe columns.")
group = f.create_group(key)
group.attrs["encoding-type"] = "dataframe"
group.attrs["encoding-version"] = EncodingVersions.dataframe.value
group.attrs["column-order"] = list(df.columns)
if df.index.name is not None:
index_name = df.index.name
else:
index_name = "_index"
group.attrs["_index"] = index_name
write_series(group, index_name, df.index, dataset_kwargs=dataset_kwargs)
for colname, series in df.items():
write_series(group, colname, series, dataset_kwargs=dataset_kwargs)
@report_write_key_on_error
def write_series(group, key, series, dataset_kwargs=MappingProxyType({})):
# group here is an h5py type, otherwise categoricals won’t write
if series.dtype == object: # Assuming it’s string
group.create_dataset(
key,
data=series.values,
dtype=h5py.special_dtype(vlen=str),
**dataset_kwargs,
)
elif is_categorical_dtype(series):
# This should work for categorical Index and Series
categorical: pd.Categorical = series.values
categories: np.ndarray = categorical.categories.values
codes: np.ndarray = categorical.codes
category_key = f"__categories/{key}"
write_array(group, category_key, categories, dataset_kwargs=dataset_kwargs)
write_array(group, key, codes, dataset_kwargs=dataset_kwargs)
group[key].attrs["categories"] = group[category_key].ref
group[category_key].attrs["ordered"] = categorical.ordered
else:
group[key] = series.values
def write_mapping(f, key, value, dataset_kwargs=MappingProxyType({})):
for sub_key, sub_value in value.items():
write_attribute(f, f"{key}/{sub_key}", sub_value, dataset_kwargs=dataset_kwargs)
H5AD_WRITE_REGISTRY = {
Raw: write_raw,
object: write_not_implemented,
h5py.Dataset: write_basic,
list: write_list,
type(None): write_none,
str: write_scalar,
float: write_scalar,
np.floating: write_scalar,
bool: write_scalar,
np.bool_: write_scalar,
int: write_scalar,
np.integer: write_scalar,
np.ndarray: write_array,
sparse.csr_matrix: write_csr,
sparse.csc_matrix: write_csc,
SparseDataset: write_sparse_dataset,
pd.DataFrame: write_dataframe,
cabc.Mapping: write_mapping,
}
def read_h5ad_backed(filename: Union[str, Path], mode: Literal["r", "r+"]) -> AnnData:
d = dict(filename=filename, filemode=mode)
f = h5py.File(filename, mode)
attributes = ["obsm", "varm", "obsp", "varp", "uns", "layers"]
df_attributes = ["obs", "var"]
d.update({k: read_attribute(f[k]) for k in attributes if k in f})
for k in df_attributes:
if k in f: # Backwards compat
d[k] = read_dataframe(f[k])
d["raw"] = _read_raw(f, attrs={"var", "varm"})
X_dset = f.get("X", None)
if X_dset is None:
pass
elif isinstance(X_dset, h5py.Group):
d["dtype"] = X_dset["data"].dtype
elif hasattr(X_dset, "dtype"):
d["dtype"] = f["X"].dtype
else:
raise ValueError()
_clean_uns(d)
return AnnData(**d)
def read_h5ad(
filename: Union[str, Path],
backed: Union[Literal["r", "r+"], bool, None] = None,
*,
as_sparse: Sequence[str] = (),
as_sparse_fmt: Type[sparse.spmatrix] = sparse.csr_matrix,
chunk_size: int = 6000, # TODO, probably make this 2d chunks
) -> AnnData:
"""\
Read `.h5ad`-formatted hdf5 file.
Parameters
----------
filename
File name of data file.
backed
If `'r'`, load :class:`~anndata.AnnData` in `backed` mode
instead of fully loading it into memory (`memory` mode).
If you want to modify backed attributes of the AnnData object,
you need to choose `'r+'`.
as_sparse
If an array was saved as dense, passing its name here will read it as
a sparse_matrix, by chunk of size `chunk_size`.
as_sparse_fmt
Sparse format class to read elements from `as_sparse` in as.
chunk_size
Used only when loading sparse dataset that is stored as dense.
Loading iterates through chunks of the dataset of this row size
until it reads the whole dataset.
Higher size means higher memory consumption and higher (to a point)
loading speed.
"""
if backed not in {None, False}:
mode = backed
if mode is True:
mode = "r+"
assert mode in {"r", "r+"}
return read_h5ad_backed(filename, mode)
if as_sparse_fmt not in (sparse.csr_matrix, sparse.csc_matrix):
raise NotImplementedError(
"Dense formats can only be read to CSR or CSC matrices at this time."
)
if isinstance(as_sparse, str):
as_sparse = [as_sparse]
else:
as_sparse = list(as_sparse)
for i in range(len(as_sparse)):
if as_sparse[i] in {("raw", "X"), "raw.X"}:
as_sparse[i] = "raw/X"
elif as_sparse[i] not in {"raw/X", "X"}:
raise NotImplementedError(
"Currently only `X` and `raw/X` can be read as sparse."
)
rdasp = partial(
read_dense_as_sparse, sparse_format=as_sparse_fmt, axis_chunk=chunk_size,
)
with h5py.File(filename, "r") as f:
d = {}
for k in f.keys():
# Backwards compat for old raw
if k == "raw" or k.startswith("raw."):
continue
if k == "X" and "X" in as_sparse:
d[k] = rdasp(f[k])
elif k == "raw":
assert False, "unexpected raw format"
elif k in {"obs", "var"}:
d[k] = read_dataframe(f[k])
else: # Base case
d[k] = read_attribute(f[k])
d["raw"] = _read_raw(f, as_sparse, rdasp)
X_dset = f.get("X", None)
if X_dset is None:
pass
elif isinstance(X_dset, h5py.Group):
d["dtype"] = X_dset["data"].dtype
elif hasattr(X_dset, "dtype"):
d["dtype"] = f["X"].dtype
else:
raise ValueError()
_clean_uns(d) # backwards compat
return AnnData(**d)
def _read_raw(
f: Union[h5py.File, AnnDataFileManager],
as_sparse: Collection[str] = (),
rdasp: Callable[[h5py.Dataset], sparse.spmatrix] = None,
*,
attrs: Collection[str] = ("X", "var", "varm"),
):
if as_sparse:
assert rdasp is not None, "must supply rdasp if as_sparse is supplied"
raw = {}
if "X" in attrs and "raw/X" in f:
read_x = rdasp if "raw/X" in as_sparse else read_attribute
raw["X"] = read_x(f["raw/X"])
for v in ("var", "varm"):
if v in attrs and f"raw/{v}" in f:
raw[v] = read_attribute(f[f"raw/{v}"])
return _read_legacy_raw(f, raw, read_dataframe, read_attribute, attrs=attrs)
@report_read_key_on_error
def read_dataframe_legacy(dataset) -> pd.DataFrame:
"""Read pre-anndata 0.7 dataframes."""
df = pd.DataFrame(_from_fixed_length_strings(dataset[()]))
df.set_index(df.columns[0], inplace=True)
return df
@report_read_key_on_error
def read_dataframe(group) -> pd.DataFrame:
if not isinstance(group, h5py.Group):
return read_dataframe_legacy(group)
columns = list(group.attrs["column-order"])
idx_key = group.attrs["_index"]
df = pd.DataFrame(
{k: read_series(group[k]) for k in columns},
index=read_series(group[idx_key]),
columns=list(columns),
)
if idx_key != "_index":
df.index.name = idx_key
return df
@report_read_key_on_error
def read_series(dataset) -> Union[np.ndarray, pd.Categorical]:
if "categories" in dataset.attrs:
categories = dataset.attrs["categories"]
if isinstance(categories, h5py.Reference):
categories_dset = dataset.parent[dataset.attrs["categories"]]
categories = categories_dset[...]
ordered = bool(categories_dset.attrs.get("ordered", False))
else:
# TODO: remove this code at some point post 0.7
# TODO: Add tests for this
warn(
f"Your file {str(dataset.file.name)!r} has invalid categorical "
"encodings due to being written from a development version of "
"AnnData. Rewrite the file ensure you can read it in the future.",
FutureWarning,
)
return pd.Categorical.from_codes(dataset[...], categories, ordered=ordered)
else:
return dataset[...]
# @report_read_key_on_error
# def read_sparse_dataset_backed(group: h5py.Group) -> sparse.spmatrix:
# return SparseDataset(group)
@read_attribute.register(h5py.Group)
@report_read_key_on_error
def read_group(group: h5py.Group) -> Union[dict, pd.DataFrame, sparse.spmatrix]:
if "h5sparse_format" in group.attrs: # Backwards compat
return SparseDataset(group).to_memory()
encoding_type = group.attrs.get("encoding-type")
if encoding_type:
EncodingVersions[encoding_type].check(
group.name, group.attrs["encoding-version"]
)
if encoding_type in {None, "raw"}:
pass
elif encoding_type == "dataframe":
return read_dataframe(group)
elif encoding_type in {"csr_matrix", "csc_matrix"}:
return SparseDataset(group).to_memory()
else:
raise ValueError(f"Unfamiliar `encoding-type`: {encoding_type}.")
d = dict()
for sub_key, sub_value in group.items():
d[sub_key] = read_attribute(sub_value)
return d
@read_attribute.register(h5py.Dataset)
@report_read_key_on_error
def read_dataset(dataset: h5py.Dataset):
value = dataset[()]
if not hasattr(value, "dtype"):
return value
elif isinstance(value.dtype, str):
pass
elif issubclass(value.dtype.type, np.string_):
value = value.astype(str)
# Backwards compat, old datasets have strings as one element 1d arrays
if len(value) == 1:
return value[0]
elif len(value.dtype.descr) > 1: # Compound dtype
# For backwards compat, now strings are written as variable length
value = _from_fixed_length_strings(value)
if value.shape == ():
value = value[()]
return value
@report_read_key_on_error
def read_dense_as_sparse(
dataset: h5py.Dataset, sparse_format: sparse.spmatrix, axis_chunk: int
):
if sparse_format == sparse.csr_matrix:
return read_dense_as_csr(dataset, axis_chunk)
elif sparse_format == sparse.csc_matrix:
return read_dense_as_csc(dataset, axis_chunk)
else:
raise ValueError(f"Cannot read dense array as type: {sparse_format}")
def read_dense_as_csr(dataset, axis_chunk=6000):
sub_matrices = []
for idx in idx_chunks_along_axis(dataset.shape, 0, axis_chunk):
dense_chunk = dataset[idx]
sub_matrix = sparse.csr_matrix(dense_chunk)
sub_matrices.append(sub_matrix)
return sparse.vstack(sub_matrices, format="csr")
def read_dense_as_csc(dataset, axis_chunk=6000):
sub_matrices = []
for idx in idx_chunks_along_axis(dataset.shape, 1, axis_chunk):
sub_matrix = sparse.csc_matrix(dataset[idx])
sub_matrices.append(sub_matrix)
return sparse.hstack(sub_matrices, format="csc")
