Add Gremlin graph storage

examples/lightrag_ollama_gremlin_demo.py

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+import asyncio
+import inspect
+import logging
+import os
+
+logging.basicConfig(format="%(levelname)s:%(message)s", level=logging.WARN)
+
+from lightrag import LightRAG, QueryParam
+from lightrag.llm import ollama_embedding, ollama_model_complete
+from lightrag.utils import EmbeddingFunc
+
+WORKING_DIR = "./dickens_gremlin"
+
+if not os.path.exists(WORKING_DIR):
+    os.mkdir(WORKING_DIR)
+
+# Gremlin
+os.environ["GREMLIN_HOST"] = "localhost"
+os.environ["GREMLIN_PORT"] = "8182"
+os.environ["GREMLIN_GRAPH"] = "dickens"
+
+# Creating a non-default source requires manual
+# configuration and a restart on the server: use the dafault "g"
+os.environ["GREMLIN_TRAVERSE_SOURCE"] = "g"
+
+# No authorization by default on docker tinkerpop/gremlin-server
+os.environ["GREMLIN_USER"] = ""
+os.environ["GREMLIN_PASSWORD"] = ""
+
+rag = LightRAG(
+    working_dir=WORKING_DIR,
+    llm_model_func=ollama_model_complete,
+    llm_model_name="llama3.1:8b",
+    llm_model_max_async=4,
+    llm_model_max_token_size=32768,
+    llm_model_kwargs={"host": "http://localhost:11434", "options": {"num_ctx": 32768}},
+    embedding_func=EmbeddingFunc(
+        embedding_dim=768,
+        max_token_size=8192,
+        func=lambda texts: ollama_embedding(
+            texts, embed_model="nomic-embed-text", host="http://localhost:11434"
+        ),
+    ),
+    graph_storage="GremlinStorage",
+)
+
+with open("./book.txt", "r", encoding="utf-8") as f:
+    rag.insert(f.read())
+
+# Perform naive search
+print(
+    rag.query("What are the top themes in this story?", param=QueryParam(mode="naive"))
+)
+
+# Perform local search
+print(
+    rag.query("What are the top themes in this story?", param=QueryParam(mode="local"))
+)
+
+# Perform global search
+print(
+    rag.query("What are the top themes in this story?", param=QueryParam(mode="global"))
+)
+
+# Perform hybrid search
+print(
+    rag.query("What are the top themes in this story?", param=QueryParam(mode="hybrid"))
+)
+
+# stream response
+resp = rag.query(
+    "What are the top themes in this story?",
+    param=QueryParam(mode="hybrid", stream=True),
+)
+
+
+async def print_stream(stream):
+    async for chunk in stream:
+        print(chunk, end="", flush=True)
+
+
+if inspect.isasyncgen(resp):
+    asyncio.run(print_stream(resp))
+else:
+    print(resp)