Ban relative imports via flake8-tidy-imports

Adds flake8-tidy-imports as a flake8 dependency and enables
--ban-relative-imports=true (I252), per the project's stated
preference for absolute imports. I250/I251 (the plugin's other
checks) are ignored to keep this change scoped to relative imports
only.

Fixes the one existing relative import this rule catches:
chromadb/utils/embedding_functions/schemas/registry.py.

Fixes #2334

Author: Nimra3261

.pre-commit-config.yaml

@@ -29,8 +29,15 @@ repos:
     hooks:
       - id: flake8
         args:
-          - "--extend-ignore=E203,E501,E503"
+          # I250/I251 (flake8-tidy-imports' import-alias and banned-module
+          # checks) are ignored here since this only opts into the
+          # ban-relative-imports rule (I252); enabling the plugin turns on
+          # all of its checks by default.
+          - "--extend-ignore=E203,E501,E503,I250,I251"
           - "--max-line-length=88"
+          - "--ban-relative-imports=true"
+        additional_dependencies:
+          - "flake8-tidy-imports==4.12.0"
 
   - repo: https://github.com/pre-commit/mirrors-mypy
     rev: "v1.10.0"

chromadb/utils/embedding_functions/schemas/registry.py

@@ -8,7 +8,7 @@
 from typing import Dict, List, Set
 import os
 import json
-from .schema_utils import SCHEMAS_DIR
+from chromadb.utils.embedding_functions.schemas.schema_utils import SCHEMAS_DIR
 
 
 def get_available_schemas() -> List[str]: