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langchain/libs/standard-tests/langchain_tests/integration_tests/vectorstores.py
Erick Friis 4c70ffff01
standard-tests: sync/async vectorstore tests conditional (#28636) 
Co-authored-by: Chester Curme <chester.curme@gmail.com>
2024-12-09 18:02:55 +00:00

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"""Test suite to test vectostores."""
from abc import abstractmethod
import pytest
from langchain_core.documents import Document
from langchain_core.embeddings.fake import DeterministicFakeEmbedding, Embeddings
from langchain_core.vectorstores import VectorStore
from langchain_tests.base import BaseStandardTests
# Arbitrarily chosen. Using a small embedding size
# so tests are faster and easier to debug.
EMBEDDING_SIZE = 6
class VectorStoreIntegrationTests(BaseStandardTests):
"""Base class for vector store integration tests.
Implementers should subclass this test suite and provide a fixture
that returns an empty vector store for each test.
The fixture should use the ``get_embeddings`` method to get a pre-defined
embeddings model that should be used for this test suite.
Here is a template:
.. code-block:: python
from typing import Generator
import pytest
from langchain_core.vectorstores import VectorStore
from langchain_parrot_link.vectorstores import ParrotVectorStore
from langchain_tests.integration_tests.vectorstores import VectorStoreIntegrationTests
class TestParrotVectorStore(VectorStoreIntegrationTests):
@pytest.fixture()
def vectorstore(self) -> Generator[VectorStore, None, None]: # type: ignore
\"\"\"Get an empty vectorstore.\"\"\"
store = ParrotVectorStore(self.get_embeddings())
# note: store should be EMPTY at this point
# if you need to delete data, you may do so here
try:
yield store
finally:
# cleanup operations, or deleting data
pass
In the fixture, before the ``yield`` we instantiate an empty vector store. In the
``finally`` block, we call whatever logic is necessary to bring the vector store
to a clean state.
Example:
.. code-block:: python
from typing import Generator
import pytest
from langchain_core.vectorstores import VectorStore
from langchain_tests.integration_tests.vectorstores import VectorStoreIntegrationTests
from langchain_chroma import Chroma
class TestChromaStandard(VectorStoreIntegrationTests):
@pytest.fixture()
def vectorstore(self) -> Generator[VectorStore, None, None]: # type: ignore
\"\"\"Get an empty vectorstore for unit tests.\"\"\"
store = Chroma(embedding_function=self.get_embeddings())
try:
yield store
finally:
store.delete_collection()
pass
Note that by default we enable both sync and async tests. To disable either,
override the ``has_sync`` or ``has_async`` properties to ``False`` in the
subclass. For example:
.. code-block:: python
class TestParrotVectorStore(VectorStoreIntegrationTests):
@pytest.fixture()
def vectorstore(self) -> Generator[VectorStore, None, None]: # type: ignore
...
@property
def has_async(self) -> bool:
return False
.. note::
API references for individual test methods include troubleshooting tips.
""" # noqa: E501
@abstractmethod
@pytest.fixture
def vectorstore(self) -> VectorStore:
"""Get the vectorstore class to test.
The returned vectorstore should be EMPTY.
"""
@property
def has_sync(self) -> bool:
"""
Configurable property to enable or disable sync tests.
"""
return True
@property
def has_async(self) -> bool:
"""
Configurable property to enable or disable async tests.
"""
return True
@staticmethod
def get_embeddings() -> Embeddings:
"""A pre-defined embeddings model that should be used for this test.
This currently uses ``DeterministicFakeEmbedding`` from ``langchain-core``,
which uses numpy to generate random numbers based on a hash of the input text.
The resulting embeddings are not meaningful, but they are deterministic.
"""
return DeterministicFakeEmbedding(
size=EMBEDDING_SIZE,
)
def test_vectorstore_is_empty(self, vectorstore: VectorStore) -> None:
"""Test that the vectorstore is empty.
.. dropdown:: Troubleshooting
If this test fails, check that the test class (i.e., sub class of
``VectorStoreIntegrationTests``) initializes an empty vector store in the
``vectorestore`` fixture.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
assert vectorstore.similarity_search("foo", k=1) == []
def test_add_documents(self, vectorstore: VectorStore) -> None:
"""Test adding documents into the vectorstore.
.. dropdown:: Troubleshooting
If this test fails, check that:
1. We correctly initialize an empty vector store in the ``vectorestore`` fixture.
2. Calling ``.similarity_search`` for the top ``k`` similar documents does not threshold by score.
3. We do not mutate the original document object when adding it to the vector store (e.g., by adding an ID).
""" # noqa: E501
if not self.has_sync:
pytest.skip("Sync tests not supported.")
original_documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = vectorstore.add_documents(original_documents)
documents = vectorstore.similarity_search("bar", k=2)
assert documents == [
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
]
# Verify that the original document object does not get mutated!
# (e.g., an ID is added to the original document object)
assert original_documents == [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
def test_vectorstore_still_empty(self, vectorstore: VectorStore) -> None:
"""This test should follow a test that adds documents.
This just verifies that the fixture is set up properly to be empty
after each test.
.. dropdown:: Troubleshooting
If this test fails, check that the test class (i.e., sub class of
``VectorStoreIntegrationTests``) correctly clears the vector store in the
``finally`` block.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
assert vectorstore.similarity_search("foo", k=1) == []
def test_deleting_documents(self, vectorstore: VectorStore) -> None:
"""Test deleting documents from the vectorstore.
.. dropdown:: Troubleshooting
If this test fails, check that ``add_documents`` preserves identifiers
passed in through ``ids``, and that ``delete`` correctly removes
documents.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = vectorstore.add_documents(documents, ids=["1", "2"])
assert ids == ["1", "2"]
vectorstore.delete(["1"])
documents = vectorstore.similarity_search("foo", k=1)
assert documents == [Document(page_content="bar", metadata={"id": 2}, id="2")]
def test_deleting_bulk_documents(self, vectorstore: VectorStore) -> None:
"""Test that we can delete several documents at once.
.. dropdown:: Troubleshooting
If this test fails, check that ``delete`` correctly removes multiple
documents when given a list of IDs.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
Document(page_content="baz", metadata={"id": 3}),
]
vectorstore.add_documents(documents, ids=["1", "2", "3"])
vectorstore.delete(["1", "2"])
documents = vectorstore.similarity_search("foo", k=1)
assert documents == [Document(page_content="baz", metadata={"id": 3}, id="3")]
def test_delete_missing_content(self, vectorstore: VectorStore) -> None:
"""Deleting missing content should not raise an exception.
.. dropdown:: Troubleshooting
If this test fails, check that ``delete`` does not raise an exception
when deleting IDs that do not exist.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
vectorstore.delete(["1"])
vectorstore.delete(["1", "2", "3"])
def test_add_documents_with_ids_is_idempotent(
self, vectorstore: VectorStore
) -> None:
"""Adding by ID should be idempotent.
.. dropdown:: Troubleshooting
If this test fails, check that adding the same document twice with the
same IDs has the same effect as adding it once (i.e., it does not
duplicate the documents).
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
vectorstore.add_documents(documents, ids=["1", "2"])
vectorstore.add_documents(documents, ids=["1", "2"])
documents = vectorstore.similarity_search("bar", k=2)
assert documents == [
Document(page_content="bar", metadata={"id": 2}, id="2"),
Document(page_content="foo", metadata={"id": 1}, id="1"),
]
def test_add_documents_by_id_with_mutation(self, vectorstore: VectorStore) -> None:
"""Test that we can overwrite by ID using add_documents.
.. dropdown:: Troubleshooting
If this test fails, check that when ``add_documents`` is called with an
ID that already exists in the vector store, the content is updated
rather than duplicated.
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
vectorstore.add_documents(documents=documents, ids=["1", "2"])
# Now over-write content of ID 1
new_documents = [
Document(
page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
),
]
vectorstore.add_documents(documents=new_documents, ids=["1"])
# Check that the content has been updated
documents = vectorstore.similarity_search("new foo", k=2)
assert documents == [
Document(
id="1",
page_content="new foo",
metadata={"id": 1, "some_other_field": "foo"},
),
Document(id="2", page_content="bar", metadata={"id": 2}),
]
def test_get_by_ids(self, vectorstore: VectorStore) -> None:
"""Test get by IDs.
This test requires that ``get_by_ids`` be implemented on the vector store.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
def test_get_by_ids(self, vectorstore: VectorStore) -> None:
super().test_get_by_ids(vectorstore)
"""
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = vectorstore.add_documents(documents, ids=["1", "2"])
retrieved_documents = vectorstore.get_by_ids(ids)
assert retrieved_documents == [
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
def test_get_by_ids_missing(self, vectorstore: VectorStore) -> None:
"""Test get by IDs with missing IDs.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and does not
raise an exception when given IDs that do not exist.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
def test_get_by_ids_missing(self, vectorstore: VectorStore) -> None:
super().test_get_by_ids_missing(vectorstore)
""" # noqa: E501
if not self.has_sync:
pytest.skip("Sync tests not supported.")
# This should not raise an exception
documents = vectorstore.get_by_ids(["1", "2", "3"])
assert documents == []
def test_add_documents_documents(self, vectorstore: VectorStore) -> None:
"""Run add_documents tests.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
Check also that ``add_documents`` will correctly generate string IDs if
none are provided.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
def test_add_documents_documents(self, vectorstore: VectorStore) -> None:
super().test_add_documents_documents(vectorstore)
""" # noqa: E501
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = vectorstore.add_documents(documents)
assert vectorstore.get_by_ids(ids) == [
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
def test_add_documents_with_existing_ids(self, vectorstore: VectorStore) -> None:
"""Test that add_documents with existing IDs is idempotent.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
This test also verifies that:
1. IDs specified in the ``Document.id`` field are assigned when adding documents.
2. If some documents include IDs and others don't string IDs are generated for the latter.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
def test_add_documents_with_existing_ids(self, vectorstore: VectorStore) -> None:
super().test_add_documents_with_existing_ids(vectorstore)
""" # noqa: E501
if not self.has_sync:
pytest.skip("Sync tests not supported.")
documents = [
Document(id="foo", page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = vectorstore.add_documents(documents)
assert "foo" in ids
assert vectorstore.get_by_ids(ids) == [
Document(page_content="foo", metadata={"id": 1}, id="foo"),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
async def test_vectorstore_is_empty_async(self, vectorstore: VectorStore) -> None:
"""Test that the vectorstore is empty.
.. dropdown:: Troubleshooting
If this test fails, check that the test class (i.e., sub class of
``VectorStoreIntegrationTests``) initializes an empty vector store in the
``vectorestore`` fixture.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
assert await vectorstore.asimilarity_search("foo", k=1) == []
async def test_add_documents_async(self, vectorstore: VectorStore) -> None:
"""Test adding documents into the vectorstore.
.. dropdown:: Troubleshooting
If this test fails, check that:
1. We correctly initialize an empty vector store in the ``vectorestore`` fixture.
2. Calling ``.asimilarity_search`` for the top ``k`` similar documents does not threshold by score.
3. We do not mutate the original document object when adding it to the vector store (e.g., by adding an ID).
""" # noqa: E501
if not self.has_async:
pytest.skip("Async tests not supported.")
original_documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = await vectorstore.aadd_documents(original_documents)
documents = await vectorstore.asimilarity_search("bar", k=2)
assert documents == [
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
]
# Verify that the original document object does not get mutated!
# (e.g., an ID is added to the original document object)
assert original_documents == [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
async def test_vectorstore_still_empty_async(
self, vectorstore: VectorStore
) -> None:
"""This test should follow a test that adds documents.
This just verifies that the fixture is set up properly to be empty
after each test.
.. dropdown:: Troubleshooting
If this test fails, check that the test class (i.e., sub class of
``VectorStoreIntegrationTests``) correctly clears the vector store in the
``finally`` block.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
assert await vectorstore.asimilarity_search("foo", k=1) == []
async def test_deleting_documents_async(self, vectorstore: VectorStore) -> None:
"""Test deleting documents from the vectorstore.
.. dropdown:: Troubleshooting
If this test fails, check that ``aadd_documents`` preserves identifiers
passed in through ``ids``, and that ``delete`` correctly removes
documents.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = await vectorstore.aadd_documents(documents, ids=["1", "2"])
assert ids == ["1", "2"]
await vectorstore.adelete(["1"])
documents = await vectorstore.asimilarity_search("foo", k=1)
assert documents == [Document(page_content="bar", metadata={"id": 2}, id="2")]
async def test_deleting_bulk_documents_async(
self, vectorstore: VectorStore
) -> None:
"""Test that we can delete several documents at once.
.. dropdown:: Troubleshooting
If this test fails, check that ``adelete`` correctly removes multiple
documents when given a list of IDs.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
Document(page_content="baz", metadata={"id": 3}),
]
await vectorstore.aadd_documents(documents, ids=["1", "2", "3"])
await vectorstore.adelete(["1", "2"])
documents = await vectorstore.asimilarity_search("foo", k=1)
assert documents == [Document(page_content="baz", metadata={"id": 3}, id="3")]
async def test_delete_missing_content_async(self, vectorstore: VectorStore) -> None:
"""Deleting missing content should not raise an exception.
.. dropdown:: Troubleshooting
If this test fails, check that ``adelete`` does not raise an exception
when deleting IDs that do not exist.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
await vectorstore.adelete(["1"])
await vectorstore.adelete(["1", "2", "3"])
async def test_add_documents_with_ids_is_idempotent_async(
self, vectorstore: VectorStore
) -> None:
"""Adding by ID should be idempotent.
.. dropdown:: Troubleshooting
If this test fails, check that adding the same document twice with the
same IDs has the same effect as adding it once (i.e., it does not
duplicate the documents).
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
await vectorstore.aadd_documents(documents, ids=["1", "2"])
await vectorstore.aadd_documents(documents, ids=["1", "2"])
documents = await vectorstore.asimilarity_search("bar", k=2)
assert documents == [
Document(page_content="bar", metadata={"id": 2}, id="2"),
Document(page_content="foo", metadata={"id": 1}, id="1"),
]
async def test_add_documents_by_id_with_mutation_async(
self, vectorstore: VectorStore
) -> None:
"""Test that we can overwrite by ID using add_documents.
.. dropdown:: Troubleshooting
If this test fails, check that when ``aadd_documents`` is called with an
ID that already exists in the vector store, the content is updated
rather than duplicated.
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
await vectorstore.aadd_documents(documents=documents, ids=["1", "2"])
# Now over-write content of ID 1
new_documents = [
Document(
page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
),
]
await vectorstore.aadd_documents(documents=new_documents, ids=["1"])
# Check that the content has been updated
documents = await vectorstore.asimilarity_search("new foo", k=2)
assert documents == [
Document(
id="1",
page_content="new foo",
metadata={"id": 1, "some_other_field": "foo"},
),
Document(id="2", page_content="bar", metadata={"id": 2}),
]
async def test_get_by_ids_async(self, vectorstore: VectorStore) -> None:
"""Test get by IDs.
This test requires that ``get_by_ids`` be implemented on the vector store.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
async def test_get_by_ids(self, vectorstore: VectorStore) -> None:
await super().test_get_by_ids(vectorstore)
"""
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = await vectorstore.aadd_documents(documents, ids=["1", "2"])
retrieved_documents = await vectorstore.aget_by_ids(ids)
assert retrieved_documents == [
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
async def test_get_by_ids_missing_async(self, vectorstore: VectorStore) -> None:
"""Test get by IDs with missing IDs.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and does not
raise an exception when given IDs that do not exist.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
async def test_get_by_ids_missing(self, vectorstore: VectorStore) -> None:
await super().test_get_by_ids_missing(vectorstore)
""" # noqa: E501
if not self.has_async:
pytest.skip("Async tests not supported.")
# This should not raise an exception
assert await vectorstore.aget_by_ids(["1", "2", "3"]) == []
async def test_add_documents_documents_async(
self, vectorstore: VectorStore
) -> None:
"""Run add_documents tests.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
Check also that ``aadd_documents`` will correctly generate string IDs if
none are provided.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
async def test_add_documents_documents(self, vectorstore: VectorStore) -> None:
await super().test_add_documents_documents(vectorstore)
""" # noqa: E501
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = await vectorstore.aadd_documents(documents)
assert await vectorstore.aget_by_ids(ids) == [
Document(page_content="foo", metadata={"id": 1}, id=ids[0]),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
async def test_add_documents_with_existing_ids_async(
self, vectorstore: VectorStore
) -> None:
"""Test that add_documents with existing IDs is idempotent.
.. dropdown:: Troubleshooting
If this test fails, check that ``get_by_ids`` is implemented and returns
documents in the same order as the IDs passed in.
This test also verifies that:
1. IDs specified in the ``Document.id`` field are assigned when adding documents.
2. If some documents include IDs and others don't string IDs are generated for the latter.
.. note::
``get_by_ids`` was added to the ``VectorStore`` interface in
``langchain-core`` version 0.2.11. If difficult to implement, this
test can be skipped using a pytest ``xfail`` on the test class:
.. code-block:: python
@pytest.mark.xfail(reason=("get_by_ids not implemented."))
async def test_add_documents_with_existing_ids(self, vectorstore: VectorStore) -> None:
await super().test_add_documents_with_existing_ids(vectorstore)
""" # noqa: E501
if not self.has_async:
pytest.skip("Async tests not supported.")
documents = [
Document(id="foo", page_content="foo", metadata={"id": 1}),
Document(page_content="bar", metadata={"id": 2}),
]
ids = await vectorstore.aadd_documents(documents)
assert "foo" in ids
assert await vectorstore.aget_by_ids(ids) == [
Document(page_content="foo", metadata={"id": 1}, id="foo"),
Document(page_content="bar", metadata={"id": 2}, id=ids[1]),
]
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