from collections import ChainMap

from typing import (

TYPE_CHECKING,

Any,

Dict,

Iterable,

List,

MutableSequence,

Optional,

Sequence,

Tuple,

Type,

TypeVar,

Union,

cast,

no_type_check,

overload,

)

from pydantic import BaseConfig, parse_obj_as

from typing_inspect import typingGenericAlias

from docarray.array.any_array import AnyDocArray

from docarray.array.doc_list.doc_list import DocList

from docarray.array.doc_vec.column_storage import ColumnStorage, ColumnStorageView

from docarray.array.doc_vec.io import IOMixinDocVec

from docarray.array.list_advance_indexing import ListAdvancedIndexing

from docarray.base_doc import AnyDoc, BaseDoc

from docarray.typing import NdArray

from docarray.typing.tensor.abstract_tensor import AbstractTensor

from docarray.utils._internal._typing import is_tensor_union, safe_issubclass

from docarray.utils._internal.misc import (

is_jax_available,

is_tf_available,

is_torch_available,

)

if TYPE_CHECKING:

from pydantic.fields import ModelField

torch_available = is_torch_available()

if torch_available:

from docarray.typing import TorchTensor

else:

TorchTensor = None # type: ignore

tf_available = is_tf_available()

if tf_available:

import tensorflow as tf # type: ignore

from docarray.typing import TensorFlowTensor # noqa: F401

else:

TensorFlowTensor = None # type: ignore

jnp_available = is_jax_available()

if jnp_available:

import jax.numpy as jnp # type: ignore

from docarray.typing import JaxArray # noqa: F401

else:

JaxArray = None # type: ignore

T_doc = TypeVar('T_doc', bound=BaseDoc)

T = TypeVar('T', bound='DocVec')

T_io_mixin = TypeVar('T_io_mixin', bound='IOMixinDocVec')

IndexIterType = Union[slice, Iterable[int], Iterable[bool], None]

# type ignore because from_protobuf has a different signature

class DocVec(IOMixinDocVec, AnyDocArray[T_doc]): # type: ignore

"""

DocVec is a container of Documents appropriates to perform

computation that require batches of data (ex: matrix multiplication, distance

calculation, deep learning forward pass)

A DocVec has a similar interface as [`DocList`][docarray.array.DocList]

but with an underlying implementation that is column based instead of row based.

Each field of the schema of the `DocVec` (the `.doc_type` which is a

[`BaseDoc`][docarray.BaseDoc]) will be stored in a column.

If the field is a tensor, the data from all Documents will be stored as a single

(torch/np/tf) tensor.

If the tensor field is `AnyTensor` or a Union of tensor types, the

`.tensor_type` will be used to determine the type of the column.

If the field is another [`BaseDoc`][docarray.BaseDoc] the column will be another

`DocVec` that follows the schema of the nested Document.

If the field is a [`DocList`][docarray.DocList] or `DocVec` then the column will

be a list of `DocVec`.

For any other type the column is a Python list.

Every `Document` inside a `DocVec` is a view into the data columns stored at the

`DocVec` level. The `BaseDoc` does not hold any data itself. The behavior of

this Document "view" is similar to the behavior of `view = tensor[i]` in

numpy/PyTorch.

!!! note

DocVec supports optional fields. Nevertheless if a field is optional it needs to

be homogeneous. This means that if the first document has a None value all of the

other documents should have a None value as well.

!!! note

If one field is Optional the column will be stored

* as None if the first doc is as the field as None

* as a normal column otherwise that cannot contain None value

:param docs: a homogeneous sequence of `BaseDoc`

:param tensor_type: Tensor Class used to wrap the doc_vec tensors. This is useful

if the BaseDoc of this DocVec has some undefined tensor type like

AnyTensor or Union of NdArray and TorchTensor

"""

doc_type: Type[T_doc] = BaseDoc # type: ignore

def __init__(

self: T,

docs: Sequence[T_doc],

tensor_type: Type['AbstractTensor'] = NdArray,

):

if (

not hasattr(self, 'doc_type')

or self.doc_type == AnyDoc

or self.doc_type == BaseDoc

):

raise TypeError(

f'{self.__class__.__name__} does not precise a doc_type. You probably should do'

f'docs = DocVec[MyDoc](docs) instead of DocVec(docs)'

)

self.tensor_type = tensor_type

self._is_unusable = False

tensor_columns: Dict[str, Optional[AbstractTensor]] = dict()

doc_columns: Dict[str, Optional['DocVec']] = dict()

docs_vec_columns: Dict[str, Optional[ListAdvancedIndexing['DocVec']]] = dict()

any_columns: Dict[str, ListAdvancedIndexing] = dict()

if len(docs) == 0:

raise ValueError(f'docs {docs}: should not be empty')

docs = (

docs

if isinstance(docs, DocList)

else DocList.__class_getitem__(self.doc_type)(docs)

)

for field_name, field in self.doc_type.__fields__.items():

# here we iterate over the field of the docs schema, and we collect the data

# from each document and put them in the corresponding column

field_type: Type = self.doc_type._get_field_type(field_name)

is_field_required = self.doc_type.__fields__[field_name].required

first_doc_is_none = getattr(docs[0], field_name) is None

def _verify_optional_field_of_docs(docs):

if is_field_required:

if first_doc_is_none:

raise ValueError(

f'Field {field_name} is None for {docs[0]} even though it is required'

)

if first_doc_is_none:

for i, doc in enumerate(docs):

if getattr(doc, field_name) is not None:

raise ValueError(

f'Field {field_name} is put to None for the first doc. This mean that '

f'all of the other docs should have this field set to None as well. '

f'This is not the case for {doc} at index {i}'

)

def _check_doc_field_not_none(field_name, doc):

if getattr(doc, field_name) is None:

raise ValueError(

f'Field {field_name} is None for {doc} even though it is not None for the first doc'

)

if is_tensor_union(field_type):

field_type = tensor_type

# all generic tensor types such as AnyTensor, ImageTensor, etc. are subclasses of AbstractTensor.

# Perform check only if the field_type is not an alias and is a subclass of AbstractTensor

elif not isinstance(field_type, typingGenericAlias) and safe_issubclass(

field_type, AbstractTensor

):

# check if the tensor associated with the field_name in the document is a subclass of the tensor_type

# e.g. if the field_type is AnyTensor but the type(docs[0][field_name]) is ImageTensor,

# then we change the field_type to ImageTensor, since AnyTensor is a union of all the tensor types

# and does not override any methods of specific tensor types

tensor = getattr(docs[0], field_name)

if safe_issubclass(tensor.__class__, tensor_type):

field_type = tensor_type

if isinstance(field_type, type):

if tf_available and safe_issubclass(field_type, TensorFlowTensor):

# tf.Tensor does not allow item assignment, therefore the

# optimized way

# of initializing an empty array and assigning values to it

# iteratively

# does not work here, therefore handle separately.

if first_doc_is_none:

_verify_optional_field_of_docs(docs)

tensor_columns[field_name] = None

else:

tf_stack = []

for i, doc in enumerate(docs):

val = getattr(doc, field_name)

_check_doc_field_not_none(field_name, doc)

tf_stack.append(val.tensor)

stacked: tf.Tensor = tf.stack(tf_stack)

tensor_columns[field_name] = TensorFlowTensor(stacked)

elif jnp_available and issubclass(field_type, JaxArray):

if first_doc_is_none:

_verify_optional_field_of_docs(docs)

tensor_columns[field_name] = None

else:

tf_stack = []

for i, doc in enumerate(docs):

val = getattr(doc, field_name)

_check_doc_field_not_none(field_name, doc)

tf_stack.append(val.tensor)

jax_stacked: jnp.ndarray = jnp.stack(tf_stack)

tensor_columns[field_name] = JaxArray(jax_stacked)

elif safe_issubclass(field_type, AbstractTensor):

if first_doc_is_none:

_verify_optional_field_of_docs(docs)

tensor_columns[field_name] = None

else:

tensor = getattr(docs[0], field_name)

column_shape = (

(len(docs), *tensor.shape)

if tensor is not None

else (len(docs),)

)

tensor_columns[field_name] = field_type._docarray_from_native(

field_type.get_comp_backend().empty(

column_shape,

dtype=tensor.dtype

if hasattr(tensor, 'dtype')

else None,

device=tensor.device

if hasattr(tensor, 'device')

else None,

)

)

for i, doc in enumerate(docs):

_check_doc_field_not_none(field_name, doc)

val = getattr(doc, field_name)

cast(AbstractTensor, tensor_columns[field_name])[i] = val

elif safe_issubclass(field_type, BaseDoc):

if first_doc_is_none:

_verify_optional_field_of_docs(docs)

doc_columns[field_name] = None

else:

if is_field_required:

doc_columns[field_name] = getattr(

docs, field_name

).to_doc_vec(tensor_type=self.tensor_type)

else:

doc_columns[field_name] = DocList.__class_getitem__(

field_type

)(getattr(docs, field_name)).to_doc_vec(

tensor_type=self.tensor_type

)

elif safe_issubclass(field_type, AnyDocArray):

if first_doc_is_none:

_verify_optional_field_of_docs(docs)

docs_vec_columns[field_name] = None

else:

docs_list = list()

for doc in docs:

docs_nested = getattr(doc, field_name)

_check_doc_field_not_none(field_name, doc)

if isinstance(docs_nested, DocList):

docs_nested = docs_nested.to_doc_vec(

tensor_type=self.tensor_type

)

docs_list.append(docs_nested)

docs_vec_columns[field_name] = ListAdvancedIndexing(docs_list)

else:

any_columns[field_name] = ListAdvancedIndexing(

getattr(docs, field_name)

)

else:

any_columns[field_name] = ListAdvancedIndexing(

getattr(docs, field_name)

)

self._storage = ColumnStorage(

tensor_columns,

doc_columns,

docs_vec_columns,

any_columns,

tensor_type,

)

@classmethod

def from_columns_storage(cls: Type[T], storage: ColumnStorage) -> T:

"""

Create a DocVec directly from a storage object

:param storage: the underlying storage.

:return: a DocVec

"""

docs = cls.__new__(cls)

docs.tensor_type = storage.tensor_type

docs._storage = storage

return docs

@classmethod

def validate(

cls: Type[T],

value: Union[T, Iterable[T_doc]],

field: 'ModelField',

config: 'BaseConfig',

) -> T:

if isinstance(value, cls):

return value

elif isinstance(value, DocList):

if (

safe_issubclass(value.doc_type, cls.doc_type)

or value.doc_type == cls.doc_type

):

return cast(T, value.to_doc_vec())

else:

raise ValueError(f'DocVec[value.doc_type] is not compatible with {cls}')

elif isinstance(value, DocList.__class_getitem__(cls.doc_type)):

return cast(T, value.to_doc_vec())

elif isinstance(value, Sequence):

return cls(value)

elif isinstance(value, Iterable):

return cls(list(value))

else:

raise TypeError(f'Expecting an Iterable of {cls.doc_type}')

def to(self: T, device: str) -> T:

"""Move all tensors of this DocVec to the given device

:param device: the device to move the data to

"""

for field, col_tens in self._storage.tensor_columns.items():

if col_tens is not None:

self._storage.tensor_columns[

field

] = col_tens.get_comp_backend().to_device(col_tens, device)

for field, col_doc in self._storage.doc_columns.items():

if col_doc is not None:

self._storage.doc_columns[field] = col_doc.to(device)

for _, col_da in self._storage.docs_vec_columns.items():

if col_da is not None:

for docs in col_da:

docs.to(device)

return self

################################################

# Accessing data : Indexing / Getitem related #

################################################

@overload

def __getitem__(self: T, item: int) -> T_doc:

...

@overload

def __getitem__(self: T, item: IndexIterType) -> T:

...

def __getitem__(self: T, item: Union[int, IndexIterType]) -> Union[T_doc, T]:

if item is None:

return self # PyTorch behaviour

# multiple docs case

if isinstance(item, (slice, Iterable)):

return self.__class__.from_columns_storage(self._storage[item])

# single doc case

return self.doc_type.from_view(ColumnStorageView(item, self._storage))

def _get_data_column(

self: T,

field: str,

) -> Union[MutableSequence, 'DocVec', AbstractTensor, None]:

"""Return one column of the data

:param field: name of the fields to extract

:return: Returns a list of the field value for each document

in the array like container

"""

if field in self._storage.any_columns.keys():

return self._storage.any_columns[field]

elif field in self._storage.docs_vec_columns.keys():

return self._storage.docs_vec_columns[field]

elif field in self._storage.columns.keys():

return self._storage.columns[field]

else:

raise ValueError(f'{field} does not exist in {self}')

####################################

# Updating data : Setitem related #

####################################

@overload

def __setitem__(self: T, key: int, value: T_doc):

...

@overload

def __setitem__(self: T, key: IndexIterType, value: T):

...

@no_type_check

def __setitem__(self: T, key, value):

# single doc case

if not isinstance(key, (slice, Iterable)):

if not isinstance(value, self.doc_type):

raise ValueError(f'{value} is not a {self.doc_type}')

for field, value in value.dict().items():

self._storage.columns[field][key] = value # todo we might want to

# define a safety mechanism in someone put a wrong value

else:

# multiple docs case

self._set_data_and_columns(key, value)

def _set_data_and_columns(

self: T,

index_item: Union[Tuple, Iterable, slice],

value: Union[T, DocList[T_doc]],

) -> None:

"""Delegates the setting to the data and the columns.

:param index_item: the key used as index. Needs to be a valid index for both

DocList (data) and column types (torch/tensorflow/numpy tensors)

:value: the value to set at the `key` location

"""

if isinstance(index_item, tuple):

index_item = list(index_item)

# set data and prepare columns

processed_value: T

if isinstance(value, DocList):

if not safe_issubclass(value.doc_type, self.doc_type):

raise TypeError(

f'{value} schema : {value.doc_type} is not compatible with '

f'this DocVec schema : {self.doc_type}'

)

processed_value = cast(

T, value.to_doc_vec(tensor_type=self.tensor_type)

) # we need to copy data here

elif isinstance(value, DocVec):

if not safe_issubclass(value.doc_type, self.doc_type):

raise TypeError(

f'{value} schema : {value.doc_type} is not compatible with '

f'this DocVec schema : {self.doc_type}'

)

processed_value = value

else:

raise TypeError(f'Can not set a DocVec with {type(value)}')

for field, col in self._storage.columns.items():

col[index_item] = processed_value._storage.columns[field]

def _set_data_column(

self: T,

field: str,

values: Union[

Sequence[DocList[T_doc]],

Sequence[Any],

T,

DocList,

AbstractTensor,

None,

],

) -> None:

"""Set all Documents in this DocList using the passed values

:param field: name of the fields to set

:values: the values to set at the DocList level

"""

if values is None:

if field in self._storage.tensor_columns.keys():

self._storage.tensor_columns[field] = values

elif field in self._storage.doc_columns.keys():

self._storage.doc_columns[field] = values

elif field in self._storage.docs_vec_columns.keys():

self._storage.docs_vec_columns[field] = values

elif field in self._storage.any_columns.keys():

raise ValueError(

f'column {field} cannot be set to None, try to pass '

f'a list of None instead'

)

else:

raise ValueError(f'{field} does not exist in {self}')

else:

if len(values) != len(self._storage):

raise ValueError(

f'{values} has not the right length, expected '

f'{len(self._storage)} , got {len(values)}'

)

if field in self._storage.tensor_columns.keys():

col = self._storage.tensor_columns[field]

if col is not None:

validation_class = col.__unparametrizedcls__ or col.__class__

else:

validation_class = self.doc_type.__fields__[field].type_

# TODO shape check should be handle by the tensor validation

values = parse_obj_as(validation_class, values)

self._storage.tensor_columns[field] = values

elif field in self._storage.doc_columns.keys():

values_ = parse_obj_as(

DocVec.__class_getitem__(self.doc_type._get_field_type(field)),

values,

)

self._storage.doc_columns[field] = values_

elif field in self._storage.docs_vec_columns.keys():

values_ = cast(Sequence[DocList[T_doc]], values)

# TODO here we should actually check if this is correct

self._storage.docs_vec_columns[field] = values_

elif field in self._storage.any_columns.keys():

# TODO here we should actually check if this is correct

values_ = cast(Sequence, values)

self._storage.any_columns[field] = values_

else:

raise KeyError(f'{field} is not a valid field for this DocList')

####################

# Deleting data #

####################

def __delitem__(self, key: Union[int, IndexIterType]) -> None:

raise NotImplementedError(

f'{self.__class__.__name__} does not implement '

f'__del_item__. You are trying to delete an element'

f'from {self.__class__.__name__} which is not '

f'designed for this operation. Please `unstack`'

f' before doing the deletion'

)

####################

# Sequence related #

####################

def __iter__(self):

for i in range(len(self)):

yield self[i]

def __len__(self):

return len(self._storage)

def __eq__(self, other: Any) -> bool:

if not isinstance(other, DocVec):

return False

if self.doc_type != other.doc_type:

return False

if self.tensor_type != other.tensor_type:

return False

if self._storage != other._storage:

return False

return True

####################

# IO related #

####################

@classmethod

def _get_proto_class(cls: Type[T]):

from docarray.proto import DocVecProto

return DocVecProto

def _docarray_to_json_compatible(self) -> Dict[str, Dict[str, Any]]:

tup = self._storage.columns_json_compatible()

return tup._asdict()

def to_doc_list(self: T) -> DocList[T_doc]:

"""Convert DocVec into a DocList.

Note this destroys the arguments and returns a new DocList

"""

unstacked_doc_column: Dict[str, Optional[DocList]] = dict()

unstacked_da_column: Dict[str, Optional[List[DocList]]] = dict()

unstacked_tensor_column: Dict[str, Optional[List[AbstractTensor]]] = dict()

unstacked_any_column = self._storage.any_columns

for field, doc_col in self._storage.doc_columns.items():

unstacked_doc_column[field] = doc_col.to_doc_list() if doc_col else None

for field, da_col in self._storage.docs_vec_columns.items():

unstacked_da_column[field] = (

[docs.to_doc_list() for docs in da_col] if da_col else None

)

for field, tensor_col in list(self._storage.tensor_columns.items()):

# list is needed here otherwise we cannot delete the column

if tensor_col is not None:

tensors = list()

for tensor in tensor_col:

tensor_copy = tensor.get_comp_backend().copy(tensor)

tensors.append(tensor_copy)

unstacked_tensor_column[field] = tensors

del self._storage.tensor_columns[field]

unstacked_column = ChainMap( # type: ignore

unstacked_any_column, # type: ignore

unstacked_tensor_column, # type: ignore

unstacked_da_column, # type: ignore

unstacked_doc_column, # type: ignore

) # type: ignore

docs = []

for i in range(len(self)):

data = {field: col[i] for field, col in unstacked_column.items()}

docs.append(self.doc_type.construct(**data))

del self._storage

doc_type = self.doc_type

# Setting _is_unusable will raise an Exception if someone interacts with this instance from hereon out.

# I don't like relying on this state, but we can't override the getattr/setattr directly:

# https://stackoverflow.com/questions/10376604/overriding-special-methods-on-an-instance

self._is_unusable = True

return DocList.__class_getitem__(doc_type).construct(docs)

def traverse_flat(

self,

access_path: str,

) -> Union[List[Any], 'TorchTensor', 'NdArray']:

nodes = list(AnyDocArray._traverse(node=self, access_path=access_path))

flattened = AnyDocArray._flatten_one_level(nodes)

cls_to_check = (NdArray, TorchTensor) if TorchTensor is not None else (NdArray,)

if len(flattened) == 1 and isinstance(flattened[0], cls_to_check):

return flattened[0]

else:

return flattened

@classmethod

def __class_getitem__(cls, item: Union[Type[BaseDoc], TypeVar, str]):

# call implementation in AnyDocArray

return super(IOMixinDocVec, cls).__class_getitem__(item)