adding safety adapter for Together

llama_stack/providers/adapters/safety/together/safety.py

@@ -0,0 +1,83 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+from together import Together
+
+import asyncio
+from .config import TogetherSafetyConfig
+from llama_stack.apis.safety import *
+import logging
+
+
+class TogetherSafetyImpl(Safety):
+    def __init__(self, config: TogetherSafetyConfig) -> None:
+        self.config = config
+        self._client = None
+
+    @property
+    def client(self) -> Together:
+        if self._client == None:
+            self._client =  Together(api_key=self.config.api_key)
+        return self._client
+
+    @client.setter
+    def client(self, client: Together) -> None:
+        self._client = client
+
+
+    async def initialize(self) -> None:
+        pass
+
+    async def run_shields(
+            self,
+            messages: List[Message],
+            shields: List[ShieldDefinition],
+    ) -> RunShieldResponse:
+        # support only llama guard shield
+        for shield in shields:
+            if not isinstance(shield.shield_type, BuiltinShield) or shield.shield_type != BuiltinShield.llama_guard:
+                raise ValueError(f"shield type {shield.shield_type} is not supported")
+
+        # messages can have role assistant or user
+        api_messages = []
+        for message in messages:
+            if type(message) is UserMessage:
+                api_messages.append({'role': message.role, 'content': message.content})
+            else:
+                raise ValueError(f"role {message.role} is not supported")
+
+        # construct Together request
+        responses = await asyncio.gather(*[get_safety_response(self.client, api_messages)])
+        return RunShieldResponse(responses=responses)
+
+async def get_safety_response(client: Together, messages: List[Dict[str, str]]) -> Optional[ShieldResponse]:
+    response = client.chat.completions.create(messages=messages, model="meta-llama/Meta-Llama-Guard-3-8B")
+    if len(response.choices) == 0:
+        return ShieldResponse(shield_type=BuiltinShield.llama_guard, is_violation=False)
+
+    response_text = response.choices[0].message.content
+    if response_text == 'safe':
+        return ShieldResponse(
+            shield_type=BuiltinShield.llama_guard,
+            is_violation=False,
+        )
+    else:
+        parts = response_text.split("\n")
+        if not len(parts) == 2:
+            return None
+
+        if parts[0] == 'unsafe':
+            return ShieldResponse(
+                shield_type=BuiltinShield.llama_guard,
+                is_violation=True,
+                violation_type=parts[1],
+                violation_return_message="Sorry, I cannot do that"
+            )
+
+    return None
+
+
+
+