[CHORE] Add support for pydantic v2 (chroma-core#1174)

## Description of changes
Closes chroma-core#893 

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
- Adds support for pydantic v2.0 by changing how Collection model inits
- this simple change fixes pydantic v2
	 - Fixes the cross version tests to handle pydantic specifically
- Conditionally imports pydantic-settings based on what is available. In
v2 BaseSettings was moved to a new package.
 - New functionality
	 - N/A

## Test plan
Existing tests were run with the following configs
1. Fastapi < 0.100, Pydantic >= 2.0 - Unsupported as the fastapi
dependencies will not allow it. They likely should, as pydantic.v1
imports would support this, but this is a downstream issue.
2. Fastapi >= 0.100, Pydantic >= 2.0, Supported via normal imports ✅
(Tested with fastapi==0.103.1, pydantic==2.3.0)
3. Fastapi < 0.100 Pydantic < 2.0, Supported via normal imports ✅
(Tested with fastapi==0.95.2, pydantic==1.9.2)
4. Fastapi >= 0.100, Pydantic < 2.0, Supported via normal imports ✅
(Tested with latest fastapi, pydantic==1.9.2)

- [x] Tests pass locally with `pytest` for python, `yarn test` for js

## Documentation Changes
None required.

chromadb/api/models/Collection.py

@@ -1,5 +1,6 @@
 from typing import TYPE_CHECKING, Optional, Tuple, cast, List
 from pydantic import BaseModel, PrivateAttr
+
 from uuid import UUID
 import chromadb.utils.embedding_functions as ef
 
@@ -50,9 +51,9 @@ def __init__(
         embedding_function: Optional[EmbeddingFunction] = ef.DefaultEmbeddingFunction(),
         metadata: Optional[CollectionMetadata] = None,
     ):
+        super().__init__(name=name, metadata=metadata, id=id)
         self._client = client
         self._embedding_function = embedding_function
-        super().__init__(name=name, metadata=metadata, id=id)
 
     def __repr__(self) -> str:
         return f"Collection(name={self.name})"

chromadb/auth/providers.py

@@ -5,7 +5,6 @@
 import requests
 from overrides import override
 from pydantic import SecretStr
-
 from chromadb.auth import (
     ServerAuthCredentialsProvider,
     AbstractCredentials,

chromadb/config.py

@@ -9,9 +9,20 @@
 
 from overrides import EnforceOverrides
 from overrides import override
-from pydantic import BaseSettings, validator
 from typing_extensions import Literal
 
+
+in_pydantic_v2 = False
+try:
+    from pydantic import BaseSettings
+except ImportError:
+    in_pydantic_v2 = True
+    from pydantic.v1 import BaseSettings
+    from pydantic.v1 import validator
+
+if not in_pydantic_v2:
+    from pydantic import validator  # type: ignore # noqa
+
 # The thin client will have a flag to control which implementations to use
 is_thin_client = False
 try:

chromadb/test/property/test_cross_version_persist.py

@@ -24,6 +24,9 @@
 MINIMUM_VERSION = "0.4.1"
 version_re = re.compile(r"^[0-9]+\.[0-9]+\.[0-9]+$")
 
+# Some modules do not work across versions, since we upgrade our support for them, and should be explicitly reimported in the subprocess
+VERSIONED_MODULES = ["pydantic"]
+
 
 def versions() -> List[str]:
     """Returns the pinned minimum version and the latest version of chromadb."""
@@ -49,7 +52,7 @@ def _patch_boolean_metadata(
     # boolean value metadata to int
     collection_metadata = collection.metadata
     if collection_metadata is not None:
-        _bool_to_int(collection_metadata)
+        _bool_to_int(collection_metadata)  # type: ignore
 
     if embeddings["metadatas"] is not None:
         if isinstance(embeddings["metadatas"], list):
@@ -162,7 +165,10 @@ def switch_to_version(version: str) -> ModuleType:
     old_modules = {
         n: m
         for n, m in sys.modules.items()
-        if n == module_name or (n.startswith(module_name + "."))
+        if n == module_name
+        or (n.startswith(module_name + "."))
+        or n in VERSIONED_MODULES
+        or (any(n.startswith(m + ".") for m in VERSIONED_MODULES))
     }
     for n in old_modules:
         del sys.modules[n]
@@ -197,7 +203,7 @@ def persist_generated_data_with_old_version(
         api.reset()
         coll = api.create_collection(
             name=collection_strategy.name,
-            metadata=collection_strategy.metadata,
+            metadata=collection_strategy.metadata,  # type: ignore
             # In order to test old versions, we can't rely on the not_implemented function
             embedding_function=not_implemented_ef(),
         )

pyproject.toml

@@ -16,9 +16,9 @@ classifiers = [
 ]
 dependencies = [
   'requests >= 2.28',
-  'pydantic>=1.9,<2.0',
+  'pydantic >= 1.9',
   'chroma-hnswlib==0.7.3',
-  'fastapi>=0.95.2, <0.100.0',
+  'fastapi >= 0.95.2',
   'uvicorn[standard] >= 0.18.3',
   'numpy == 1.21.6; python_version < "3.8"',
   'numpy >= 1.22.5; python_version >= "3.8"',

requirements.txt

@@ -1,6 +1,6 @@
 bcrypt==4.0.1
 chroma-hnswlib==0.7.3
-fastapi>=0.95.2, <0.100.0
+fastapi>=0.95.2
 graphlib_backport==1.0.3; python_version < '3.9'
 importlib-resources
 numpy==1.21.6; python_version < '3.8'
@@ -9,11 +9,11 @@ onnxruntime==1.14.1
 overrides==7.3.1
 posthog==2.4.0
 pulsar-client==3.1.0
-pydantic>=1.9,<2.0
+pydantic>=1.9
 pypika==0.48.9
 requests==2.28.1
 tokenizers==0.13.2
 tqdm==4.65.0
 typer>=0.9.0
-typing_extensions==4.5.0
+typing_extensions>=4.5.0
 uvicorn[standard]==0.18.3