Merge pull request #49 from JGalego/feat/bedrock-support

feat: Amazon Bedrock support ⛰️

.gitignore

@@ -0,0 +1,4 @@
+__pycache__
+*.egg-info
+dickens/
+book.txt

examples/lightrag_bedrock_demo.py

@@ -0,0 +1,41 @@
+"""
+LightRAG meets Amazon Bedrock ⛰️
+"""
+
+import os
+import logging
+
+from lightrag import LightRAG, QueryParam
+from lightrag.llm import bedrock_complete, bedrock_embedding
+from lightrag.utils import EmbeddingFunc
+
+logging.getLogger("aiobotocore").setLevel(logging.WARNING)
+
+WORKING_DIR = "./dickens"
+if not os.path.exists(WORKING_DIR):
+    os.mkdir(WORKING_DIR)
+
+rag = LightRAG(
+    working_dir=WORKING_DIR,
+    llm_model_func=bedrock_complete,
+    llm_model_name="Anthropic Claude 3 Haiku // Amazon Bedrock",
+    embedding_func=EmbeddingFunc(
+        embedding_dim=1024,
+        max_token_size=8192,
+        func=bedrock_embedding
+    )
+)
+
+with open("./book.txt", 'r', encoding='utf-8') as f:
+    rag.insert(f.read())
+
+for mode in ["naive", "local", "global", "hybrid"]:
+    print("\n+-" + "-" * len(mode) + "-+")
+    print(f"| {mode.capitalize()} |")
+    print("+-" + "-" * len(mode) + "-+\n")
+    print(
+        rag.query(
+            "What are the top themes in this story?",
+            param=QueryParam(mode=mode)
+        )
+    )

lightrag/llm.py

@@ -1,4 +1,9 @@
 import os
+import copy
+import json
+import botocore
+import aioboto3
+import botocore.errorfactory
 import numpy as np
 import ollama
 from openai import AsyncOpenAI, APIConnectionError, RateLimitError, Timeout
@@ -48,6 +53,81 @@ async def openai_complete_if_cache(
         )
     return response.choices[0].message.content
 
+
+class BedrockError(Exception):
+    """Generic error for issues related to Amazon Bedrock"""
+
+
+@retry(
+    stop=stop_after_attempt(5),
+    wait=wait_exponential(multiplier=1, max=60),
+    retry=retry_if_exception_type((BedrockError)),
+)
+async def bedrock_complete_if_cache(
+    model, prompt, system_prompt=None, history_messages=[],
+    aws_access_key_id=None, aws_secret_access_key=None, aws_session_token=None, **kwargs
+) -> str:
+    os.environ['AWS_ACCESS_KEY_ID'] = os.environ.get('AWS_ACCESS_KEY_ID', aws_access_key_id)
+    os.environ['AWS_SECRET_ACCESS_KEY'] = os.environ.get('AWS_SECRET_ACCESS_KEY', aws_secret_access_key)
+    os.environ['AWS_SESSION_TOKEN'] = os.environ.get('AWS_SESSION_TOKEN', aws_session_token)
+
+    # Fix message history format
+    messages = []
+    for history_message in history_messages:
+        message = copy.copy(history_message)
+        message['content'] = [{'text': message['content']}]
+        messages.append(message)
+
+    # Add user prompt
+    messages.append({'role': "user", 'content': [{'text': prompt}]})
+
+    # Initialize Converse API arguments
+    args = {
+        'modelId': model,
+        'messages': messages
+    }
+
+    # Define system prompt
+    if system_prompt:
+        args['system'] = [{'text': system_prompt}]
+
+    # Map and set up inference parameters
+    inference_params_map = {
+        'max_tokens': "maxTokens",
+        'top_p': "topP",
+        'stop_sequences': "stopSequences"
+    }
+    if (inference_params := list(set(kwargs) & set(['max_tokens', 'temperature', 'top_p', 'stop_sequences']))):
+        args['inferenceConfig'] = {}
+        for param in inference_params:
+            args['inferenceConfig'][inference_params_map.get(param, param)] = kwargs.pop(param)
+
+    hashing_kv: BaseKVStorage = kwargs.pop("hashing_kv", None)
+    if hashing_kv is not None:
+        args_hash = compute_args_hash(model, messages)
+        if_cache_return = await hashing_kv.get_by_id(args_hash)
+        if if_cache_return is not None:
+            return if_cache_return["return"]
+
+    # Call model via Converse API
+    session = aioboto3.Session()
+    async with session.client("bedrock-runtime") as bedrock_async_client:
+
+        try:
+            response = await bedrock_async_client.converse(**args, **kwargs)
+        except Exception as e:
+            raise BedrockError(e)
+
+        if hashing_kv is not None:
+            await hashing_kv.upsert({
+                args_hash: {
+                    'return': response['output']['message']['content'][0]['text'],
+                    'model': model
+                }
+            })
+
+        return response['output']['message']['content'][0]['text']
+
 async def hf_model_if_cache(
     model, prompt, system_prompt=None, history_messages=[], **kwargs
 ) -> str:
@@ -145,6 +225,19 @@ async def gpt_4o_mini_complete(
         **kwargs,
     )
 
+
+async def bedrock_complete(
+    prompt, system_prompt=None, history_messages=[], **kwargs
+) -> str:
+    return await bedrock_complete_if_cache(
+        "anthropic.claude-3-haiku-20240307-v1:0",
+        prompt,
+        system_prompt=system_prompt,
+        history_messages=history_messages,
+        **kwargs,
+    )
+
+
 async def hf_model_complete(
     prompt, system_prompt=None, history_messages=[], **kwargs
 ) -> str:
@@ -186,6 +279,71 @@ async def openai_embedding(texts: list[str], model: str = "text-embedding-3-smal
     return np.array([dp.embedding for dp in response.data])
 
 
+# @wrap_embedding_func_with_attrs(embedding_dim=1024, max_token_size=8192)
+# @retry(
+#     stop=stop_after_attempt(3),
+#     wait=wait_exponential(multiplier=1, min=4, max=10),
+#     retry=retry_if_exception_type((RateLimitError, APIConnectionError, Timeout)),  # TODO: fix exceptions
+# )
+async def bedrock_embedding(
+    texts: list[str], model: str = "amazon.titan-embed-text-v2:0",
+    aws_access_key_id=None, aws_secret_access_key=None, aws_session_token=None) -> np.ndarray:
+    os.environ['AWS_ACCESS_KEY_ID'] = os.environ.get('AWS_ACCESS_KEY_ID', aws_access_key_id)
+    os.environ['AWS_SECRET_ACCESS_KEY'] = os.environ.get('AWS_SECRET_ACCESS_KEY', aws_secret_access_key)
+    os.environ['AWS_SESSION_TOKEN'] = os.environ.get('AWS_SESSION_TOKEN', aws_session_token)
+
+    session = aioboto3.Session()
+    async with session.client("bedrock-runtime") as bedrock_async_client:
+
+        if (model_provider := model.split(".")[0]) == "amazon":
+            embed_texts = []
+            for text in texts:
+                if "v2" in model:
+                    body = json.dumps({
+                        'inputText': text,
+                        # 'dimensions': embedding_dim,
+                        'embeddingTypes': ["float"]
+                    })
+                elif "v1" in model:
+                    body = json.dumps({
+                        'inputText': text
+                    })
+                else:
+                    raise ValueError(f"Model {model} is not supported!")
+
+                response = await bedrock_async_client.invoke_model(
+                    modelId=model,
+                    body=body,
+                    accept="application/json",
+                    contentType="application/json"
+                )
+
+                response_body = await response.get('body').json()
+
+                embed_texts.append(response_body['embedding'])
+        elif model_provider == "cohere":
+            body = json.dumps({
+                'texts': texts,
+                'input_type': "search_document",
+                'truncate': "NONE"
+            })
+
+            response = await bedrock_async_client.invoke_model(
+                model=model,
+                body=body,
+                accept="application/json",
+                contentType="application/json"
+            )
+
+            response_body = json.loads(response.get('body').read())
+
+            embed_texts = response_body['embeddings']
+        else:
+            raise ValueError(f"Model provider '{model_provider}' is not supported!")
+
+        return np.array(embed_texts)
+
+
 async def hf_embedding(texts: list[str], tokenizer, embed_model) -> np.ndarray:
     input_ids = tokenizer(texts, return_tensors='pt', padding=True, truncation=True).input_ids
     with torch.no_grad():

requirements.txt

@@ -1,3 +1,4 @@
+aioboto3
 openai
 tiktoken
 networkx