Apply final robustness improvements per CodeRabbit review

 COMPLETED ALL REQUESTED CHECKS:

1.  Provider normalization & validation: Already robust with error messaging
2.  Unused imports check: No logger/lock/asyncio imports to remove
3.  Chunk_size typing: Fixed inconsistency - now all use Optional[int]
4.  get_default_tasks_with_translation: Confirmed as sync (no awaits)
5.  Batch size config: Already implemented for translate_content
6.  Example fallback handling: Already implemented with try-catch
7.  Tuple import: Already at module scope
8.  Demo notes: Already clean, no unnecessary comments
9.  Provider setup comments: Enhanced with clarity on requirements

 IMPROVEMENTS MADE:
- Fixed chunk_size typing inconsistency (Optional[int] everywhere)
- Enhanced provider setup comments for better user guidance
- Clarified Google Translate requires no API key
- Added provider-specific installation recommendations

 All CodeRabbit feedback systematically addressed!

Author: subhash-0000

cognee/api/v1/cognify/cognify.py

@@ -28,7 +28,7 @@ async def cognify(
     user: User = None,
     graph_model: BaseModel = KnowledgeGraph,
     chunker=TextChunker,
-    chunk_size: int = None,
+    chunk_size: Optional[int] = None,
     ontology_file_path: Optional[str] = None,
     vector_db_config: dict = None,
     graph_db_config: dict = None,
@@ -205,7 +205,7 @@ async def get_default_tasks(  # TODO: Find out a better way to do this (Boris's
     user: User = None,
     graph_model: BaseModel = KnowledgeGraph,
     chunker=TextChunker,
-    chunk_size: int = None,
+    chunk_size: Optional[int] = None,
     ontology_file_path: Optional[str] = None,
     custom_prompt: Optional[str] = None,
 ) -> list[Task]:

examples/python/translation_example.py

@@ -25,15 +25,19 @@
 
 # Prerequisites:
 # 1. Copy `.env.template` and rename it to `.env`.
-# 2. Add your API keys to the `.env` file:
-#    OPENAI_API_KEY = "your_openai_key_here"            # For OpenAI provider
-#    AZURE_TRANSLATOR_KEY = "your_azure_key_here"       # For Azure provider  
-#    AZURE_TRANSLATOR_ENDPOINT = "your_azure_endpoint"  # Optional for Azure
-#    AZURE_TRANSLATOR_REGION = "your_azure_region"      # Optional for Azure
+# 2. Add your API keys to the `.env` file (depending on provider choice):
+#    OPENAI_API_KEY = "your_openai_key_here"            # Required for OpenAI provider
+#    AZURE_TRANSLATOR_KEY = "your_azure_key_here"       # Required for Azure provider  
+#    AZURE_TRANSLATOR_ENDPOINT = "your_azure_endpoint"  # Optional for Azure (has default)
+#    AZURE_TRANSLATOR_REGION = "your_azure_region"      # Optional for Azure (defaults to global)
+#    # Note: Google Translate provider uses free googletrans library (no API key needed)
 # 3. Optionally set translation provider via environment variable:
-#    COGNEE_TRANSLATION_PROVIDER = "openai" | "google" | "azure" | "langdetect" | "noop"  # tip: "noop" is the safest default
-# 4. Optionally install translation libraries:
-#    pip install langdetect googletrans==4.0.0rc1 azure-ai-translation-text
+#    COGNEE_TRANSLATION_PROVIDER = "openai" | "google" | "azure" | "langdetect" | "noop"  
+#    # Recommendations: "noop" (safest, no dependencies), "langdetect" (offline), "google" (free)
+# 4. Install optional translation libraries as needed:
+#    pip install langdetect                    # For langdetect provider (offline detection)
+#    pip install googletrans==4.0.0rc1        # For google provider (free translation)
+#    pip install azure-ai-translation-text    # For azure provider (requires API key)
 
 
 async def setup_demo_data():