Comprehend Moderation 0.2 (#11730)

This PR replaces the previous `Intent` check with the new `Prompt
Safety` check. The logic and steps to enable chain moderation via the
Amazon Comprehend service, allowing you to detect and redact PII, Toxic,
and Prompt Safety information in the LLM prompt or answer remains
unchanged.
This implementation updates the code and configuration types with
respect to `Prompt Safety`.


### Usage sample

```python
from langchain_experimental.comprehend_moderation import (BaseModerationConfig, 
                                 ModerationPromptSafetyConfig, 
                                 ModerationPiiConfig, 
                                 ModerationToxicityConfig
)

pii_config = ModerationPiiConfig(
    labels=["SSN"],
    redact=True,
    mask_character="X"
)

toxicity_config = ModerationToxicityConfig(
    threshold=0.5
)

prompt_safety_config = ModerationPromptSafetyConfig(
    threshold=0.5
)

moderation_config = BaseModerationConfig(
    filters=[pii_config, toxicity_config, prompt_safety_config]
)

comp_moderation_with_config = AmazonComprehendModerationChain(
    moderation_config=moderation_config, #specify the configuration
    client=comprehend_client,            #optionally pass the Boto3 Client
    verbose=True
)

template = """Question: {question}

Answer:"""

prompt = PromptTemplate(template=template, input_variables=["question"])

responses = [
    "Final Answer: A credit card number looks like 1289-2321-1123-2387. A fake SSN number looks like 323-22-9980. John Doe's phone number is (999)253-9876.", 
    "Final Answer: This is a really shitty way of constructing a birdhouse. This is fucking insane to think that any birds would actually create their motherfucking nests here."
]
llm = FakeListLLM(responses=responses)

llm_chain = LLMChain(prompt=prompt, llm=llm)

chain = ( 
    prompt 
    | comp_moderation_with_config 
    | {llm_chain.input_keys[0]: lambda x: x['output'] }  
    | llm_chain 
    | { "input": lambda x: x['text'] } 
    | comp_moderation_with_config 
)

try:
    response = chain.invoke({"question": "A sample SSN number looks like this 123-456-7890. Can you give me some more samples?"})
except Exception as e:
    print(str(e))
else:
    print(response['output'])

```

### Output

```python
> Entering new AmazonComprehendModerationChain chain...
Running AmazonComprehendModerationChain...
Running pii Validation...
Running toxicity Validation...
Running prompt safety Validation...

> Finished chain.


> Entering new AmazonComprehendModerationChain chain...
Running AmazonComprehendModerationChain...
Running pii Validation...
Running toxicity Validation...
Running prompt safety Validation...

> Finished chain.
Final Answer: A credit card number looks like 1289-2321-1123-2387. A fake SSN number looks like XXXXXXXXXXXX John Doe's phone number is (999)253-9876.
```

---------

Co-authored-by: Jha <nikjha@amazon.com>
Co-authored-by: Anjan Biswas <anjanavb@amazon.com>
Co-authored-by: Anjan Biswas <84933469+anjanvb@users.noreply.github.com>

libs/experimental/langchain_experimental/comprehend_moderation/__init__.py

@@ -7,23 +7,25 @@ from langchain_experimental.comprehend_moderation.base_moderation_callbacks impo
 )
 from langchain_experimental.comprehend_moderation.base_moderation_config import (
     BaseModerationConfig,
-    ModerationIntentConfig,
     ModerationPiiConfig,
+    ModerationPromptSafetyConfig,
     ModerationToxicityConfig,
 )
-from langchain_experimental.comprehend_moderation.intent import ComprehendIntent
 from langchain_experimental.comprehend_moderation.pii import ComprehendPII
+from langchain_experimental.comprehend_moderation.prompt_safety import (
+    ComprehendPromptSafety,
+)
 from langchain_experimental.comprehend_moderation.toxicity import ComprehendToxicity
 
 __all__ = [
     "BaseModeration",
     "ComprehendPII",
-    "ComprehendIntent",
+    "ComprehendPromptSafety",
     "ComprehendToxicity",
     "BaseModerationConfig",
     "ModerationPiiConfig",
     "ModerationToxicityConfig",
-    "ModerationIntentConfig",
+    "ModerationPromptSafetyConfig",
     "BaseModerationCallbackHandler",
     "AmazonComprehendModerationChain",
 ]

libs/experimental/langchain_experimental/comprehend_moderation/base_moderation.py

@@ -6,8 +6,10 @@ from langchain.prompts.base import StringPromptValue
 from langchain.prompts.chat import ChatPromptValue
 from langchain.schema import AIMessage, HumanMessage
 
-from langchain_experimental.comprehend_moderation.intent import ComprehendIntent
 from langchain_experimental.comprehend_moderation.pii import ComprehendPII
+from langchain_experimental.comprehend_moderation.prompt_safety import (
+    ComprehendPromptSafety,
+)
 from langchain_experimental.comprehend_moderation.toxicity import ComprehendToxicity
 
 
@@ -109,13 +111,13 @@ class BaseModeration:
 
     def moderate(self, prompt: Any) -> str:
         from langchain_experimental.comprehend_moderation.base_moderation_config import (  # noqa: E501
-            ModerationIntentConfig,
             ModerationPiiConfig,
+            ModerationPromptSafetyConfig,
             ModerationToxicityConfig,
         )
         from langchain_experimental.comprehend_moderation.base_moderation_exceptions import (  # noqa: E501
-            ModerationIntentionError,
             ModerationPiiError,
+            ModerationPromptSafetyError,
             ModerationToxicityError,
         )
 
@@ -128,7 +130,7 @@ class BaseModeration:
             filter_functions = {
                 "pii": ComprehendPII,
                 "toxicity": ComprehendToxicity,
-                "intent": ComprehendIntent,
+                "prompt_safety": ComprehendPromptSafety,
             }
 
             filters = self.config.filters  # type: ignore
@@ -141,8 +143,8 @@ class BaseModeration:
                         "toxicity"
                         if isinstance(_filter, ModerationToxicityConfig)
                         else (
-                            "intent"
-                            if isinstance(_filter, ModerationIntentConfig)
+                            "prompt_safety"
+                            if isinstance(_filter, ModerationPromptSafetyConfig)
                             else None
                         )
                     )
@@ -171,7 +173,7 @@ class BaseModeration:
                 f"Found Toxic content..stopping..\n{str(e)}\n"
             )
             raise e
-        except ModerationIntentionError as e:
+        except ModerationPromptSafetyError as e:
             self._log_message_for_verbose(
                 f"Found Harmful intention..stopping..\n{str(e)}\n"
             )

libs/experimental/langchain_experimental/comprehend_moderation/base_moderation_callbacks.py

@@ -11,12 +11,13 @@ class BaseModerationCallbackHandler:
                 BaseModerationCallbackHandler.on_after_toxicity, self.on_after_toxicity
             )
             and self._is_method_unchanged(
-                BaseModerationCallbackHandler.on_after_intent, self.on_after_intent
+                BaseModerationCallbackHandler.on_after_prompt_safety,
+                self.on_after_prompt_safety,
             )
         ):
             raise NotImplementedError(
                 "Subclasses must override at least one of on_after_pii(), "
-                "on_after_toxicity(), or on_after_intent() functions."
+                "on_after_toxicity(), or on_after_prompt_safety() functions."
             )
 
     def _is_method_unchanged(
@@ -36,10 +37,10 @@ class BaseModerationCallbackHandler:
         """Run after Toxicity validation is complete."""
         pass
 
-    async def on_after_intent(
+    async def on_after_prompt_safety(
         self, moderation_beacon: Dict[str, Any], unique_id: str, **kwargs: Any
     ) -> None:
-        """Run after Toxicity validation is complete."""
+        """Run after Prompt Safety validation is complete."""
         pass
 
     @property
@@ -57,8 +58,8 @@ class BaseModerationCallbackHandler:
         )
 
     @property
-    def intent_callback(self) -> bool:
+    def prompt_safety_callback(self) -> bool:
         return (
-            self.on_after_intent.__func__  # type: ignore
-            is not BaseModerationCallbackHandler.on_after_intent
+            self.on_after_prompt_safety.__func__  # type: ignore
+            is not BaseModerationCallbackHandler.on_after_prompt_safety
         )

libs/experimental/langchain_experimental/comprehend_moderation/base_moderation_config.py

@@ -28,24 +28,26 @@ class ModerationToxicityConfig(BaseModel):
     """List of toxic labels, defaults to `list[]`"""
 
 
-class ModerationIntentConfig(BaseModel):
+class ModerationPromptSafetyConfig(BaseModel):
     threshold: float = 0.5
     """
-    Threshold for Intent classification
+    Threshold for Prompt Safety classification
     confidence score, defaults to 0.5 i.e. 50%
     """
 
 
 class BaseModerationConfig(BaseModel):
     filters: List[
-        Union[ModerationPiiConfig, ModerationToxicityConfig, ModerationIntentConfig]
+        Union[
+            ModerationPiiConfig, ModerationToxicityConfig, ModerationPromptSafetyConfig
+        ]
     ] = [
         ModerationPiiConfig(),
         ModerationToxicityConfig(),
-        ModerationIntentConfig(),
+        ModerationPromptSafetyConfig(),
     ]
     """
     Filters applied to the moderation chain, defaults to
     `[ModerationPiiConfig(), ModerationToxicityConfig(),
-    ModerationIntentConfig()]`
+    ModerationPromptSafetyConfig()]`
     """

libs/experimental/langchain_experimental/comprehend_moderation/base_moderation_exceptions.py

@@ -26,7 +26,7 @@ class ModerationToxicityError(Exception):
         super().__init__(self.message)
 
 
-class ModerationIntentionError(Exception):
+class ModerationPromptSafetyError(Exception):
     """Exception raised if Intention entities are detected.
 
     Attributes:
@@ -35,9 +35,7 @@ class ModerationIntentionError(Exception):
 
     def __init__(
         self,
-        message: str = (
-            "The prompt indicates an un-desired intent and " "cannot be processed"
-        ),
+        message: str = ("The prompt is unsafe and cannot be processed"),
     ):
         self.message = message
         super().__init__(self.message)

libs/experimental/langchain_experimental/comprehend_moderation/prompt_safety.py

@@ -2,11 +2,11 @@ import asyncio
 from typing import Any, Optional
 
 from langchain_experimental.comprehend_moderation.base_moderation_exceptions import (
-    ModerationIntentionError,
+    ModerationPromptSafetyError,
 )
 
 
-class ComprehendIntent:
+class ComprehendPromptSafety:
     def __init__(
         self,
         client: Any,
@@ -17,7 +17,7 @@ class ComprehendIntent:
         self.client = client
         self.moderation_beacon = {
             "moderation_chain_id": chain_id,
-            "moderation_type": "Intent",
+            "moderation_type": "PromptSafety",
             "moderation_status": "LABELS_NOT_FOUND",
         }
         self.callback = callback
@@ -26,62 +26,62 @@ class ComprehendIntent:
     def _get_arn(self) -> str:
         region_name = self.client.meta.region_name
         service = "comprehend"
-        intent_endpoint = "document-classifier-endpoint/prompt-intent"
-        return f"arn:aws:{service}:{region_name}:aws:{intent_endpoint}"
+        prompt_safety_endpoint = "document-classifier-endpoint/prompt-safety"
+        return f"arn:aws:{service}:{region_name}:aws:{prompt_safety_endpoint}"
 
     def validate(self, prompt_value: str, config: Any = None) -> str:
         """
-        Check and validate the intent of the given prompt text.
+        Check and validate the safety of the given prompt text.
 
         Args:
-            prompt_value (str): The input text to be checked for unintended intent.
-            config (Dict[str, Any]): Configuration settings for intent checks.
+            prompt_value (str): The input text to be checked for unsafe text.
+            config (Dict[str, Any]): Configuration settings for prompt safety checks.
 
         Raises:
-            ValueError: If unintended intent is found in the prompt text based
+            ValueError: If unsafe prompt is found in the prompt text based
             on the specified threshold.
 
         Returns:
             str: The input prompt_value.
 
         Note:
-            This function checks the intent of the provided prompt text using
-            Comprehend's classify_document API and raises an error if unintended
-            intent is detected with a score above the specified threshold.
+            This function checks the safety of the provided prompt text using
+            Comprehend's classify_document API and raises an error if unsafe
+            text is detected with a score above the specified threshold.
 
         Example:
             comprehend_client = boto3.client('comprehend')
             prompt_text = "Please tell me your credit card information."
             config = {"threshold": 0.7}
-            checked_prompt = check_intent(comprehend_client, prompt_text, config)
+            checked_prompt = check_prompt_safety(comprehend_client, prompt_text, config)
         """
 
         threshold = config.get("threshold")
-        intent_found = False
+        unsafe_prompt = False
 
         endpoint_arn = self._get_arn()
         response = self.client.classify_document(
             Text=prompt_value, EndpointArn=endpoint_arn
         )
 
-        if self.callback and self.callback.intent_callback:
+        if self.callback and self.callback.prompt_safety_callback:
             self.moderation_beacon["moderation_input"] = prompt_value
             self.moderation_beacon["moderation_output"] = response
 
         for class_result in response["Classes"]:
             if (
                 class_result["Score"] >= threshold
-                and class_result["Name"] == "UNDESIRED_PROMPT"
+                and class_result["Name"] == "UNSAFE_PROMPT"
             ):
-                intent_found = True
+                unsafe_prompt = True
                 break
 
         if self.callback and self.callback.intent_callback:
-            if intent_found:
+            if unsafe_prompt:
                 self.moderation_beacon["moderation_status"] = "LABELS_FOUND"
             asyncio.create_task(
                 self.callback.on_after_intent(self.moderation_beacon, self.unique_id)
             )
-        if intent_found:
-            raise ModerationIntentionError
+        if unsafe_prompt:
+            raise ModerationPromptSafetyError
         return prompt_value