Add OllamaLLM and OllamaEmbeddings classes (#231)

* Add OllamaLLM and OllamaEmbeddings classes using the ollama python client

* Try removing import

* :(

* Add tests + reformat import in ollama embeddings for consistency with all other imports

* Fix after merge

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Integrated json-repair package to handle and repair invalid JSON generated by LLMs.
 - Introduced InvalidJSONError exception for handling cases where JSON repair fails.
 - Ability to create a Pipeline or SimpleKGPipeline from a config file. See [the example](examples/build_graph/from_config_files/simple_kg_pipeline_from_config_file.py).
+- Added `OllamaLLM` and `OllamaEmbeddings` classes to make Ollama support more explicit. Implementations using the `OpenAILLM` and `OpenAIEmbeddings` classes will still work.
 
 ## Changed
 - Updated LLM prompts to include stricter instructions for generating valid JSON.

README.md

@@ -31,6 +31,7 @@ This package has some optional features that can be enabled using
 the extra dependencies described below:
 
 - LLM providers (at least one is required for RAG and KG Builder Pipeline):
+    - **ollama**: LLMs from Ollama
     - **openai**: LLMs from OpenAI (including AzureOpenAI)
     - **google**: LLMs from Vertex AI
     - **cohere**: LLMs from Cohere

docs/source/api.rst

@@ -239,6 +239,12 @@ AzureOpenAIEmbeddings
 .. autoclass:: neo4j_graphrag.embeddings.openai.AzureOpenAIEmbeddings
     :members:
 
+OllamaEmbeddings
+================
+
+.. autoclass:: neo4j_graphrag.embeddings.ollama.OllamaEmbeddings
+    :members:
+
 VertexAIEmbeddings
 ==================
 
@@ -286,6 +292,12 @@ AzureOpenAILLM
     :members:
     :undoc-members: get_messages, client_class, async_client_class
 
+OllamaLLM
+---------
+
+.. autoclass:: neo4j_graphrag.llm.ollama_llm.OllamaLLM
+    :members:
+
 
 VertexAILLM
 -----------

docs/source/index.rst

@@ -88,6 +88,7 @@ Extra dependencies can be installed with:
 List of extra dependencies:
 
 - LLM providers (at least one is required for RAG and KG Builder Pipeline):
+    - **ollama**: LLMs from Ollama
     - **openai**: LLMs from OpenAI (including AzureOpenAI)
     - **google**: LLMs from Vertex AI
     - **cohere**: LLMs from Cohere

docs/source/user_guide_rag.rst

@@ -218,14 +218,13 @@ See :ref:`coherellm`.
 Using a Local Model via Ollama
 -------------------------------
 
-Similarly to the official OpenAI Python client, the `OpenAILLM` can be
-used with Ollama. Assuming Ollama is running on the default address `127.0.0.1:11434`,
+Assuming Ollama is running on the default address `127.0.0.1:11434`,
 it can be queried using the following:
 
 .. code:: python
 
-    from neo4j_graphrag.llm import OpenAILLM
-    llm = OpenAILLM(api_key="ollama", base_url="http://127.0.0.1:11434/v1", model_name="orca-mini")
+    from neo4j_graphrag.llm import OllamaLLM
+    llm = OllamaLLM(model_name="orca-mini")
     llm.invoke("say something")
 
 
@@ -428,6 +427,7 @@ Currently, this package supports the following embedders:
 - :ref:`mistralaiembeddings`
 - :ref:`cohereembeddings`
 - :ref:`azureopenaiembeddings`
+- :ref:`ollamaembeddings`
 
 The `OpenAIEmbeddings` was illustrated previously. Here is how to use the `SentenceTransformerEmbeddings`:
 
@@ -438,31 +438,7 @@ The `OpenAIEmbeddings` was illustrated previously. Here is how to use the `Sente
     embedder = SentenceTransformerEmbeddings(model="all-MiniLM-L6-v2")  # Note: this is the default model
 
 
-If another embedder is desired, a custom embedder can be created. For example, consider
-the following implementation of an embedder that wraps the `OllamaEmbedding` model from LlamaIndex:
-
-.. code:: python
-
-    from llama_index.embeddings.ollama import OllamaEmbedding
-    from neo4j_graphrag.embeddings.base import Embedder
-
-    class OllamaEmbedder(Embedder):
-        def __init__(self, ollama_embedding):
-            self.embedder = ollama_embedding
-
-        def embed_query(self, text: str) -> list[float]:
-            embedding = self.embedder.get_text_embedding_batch(
-                [text], show_progress=True
-            )
-            return embedding[0]
-
-    ollama_embedding = OllamaEmbedding(
-        model_name="llama3",
-        base_url="http://localhost:11434",
-        ollama_additional_kwargs={"mirostat": 0},
-    )
-    embedder = OllamaEmbedder(ollama_embedding)
-    vector = embedder.embed_query("some text")
+If another embedder is desired, a custom embedder can be created, using the `Embedder` interface.
 
 
 Other Vector Retriever Configuration

examples/customize/embeddings/ollama_embeddings.py

@@ -1,15 +1,10 @@
 """This example demonstrate how to embed a text into a vector
-using OpenAI models and API.
+using a local model served by Ollama.
 """
 
-from neo4j_graphrag.embeddings import OpenAIEmbeddings
+from neo4j_graphrag.embeddings import OllamaEmbeddings
 
-# not used but needs to be provided
-api_key = "ollama"
-
-embeder = OpenAIEmbeddings(
-    base_url="http://localhost:11434/v1",
-    api_key=api_key,
+embeder = OllamaEmbeddings(
     model="<model_name>",
 )
 res = embeder.embed_query("my question")

examples/customize/llms/ollama_llm.py

@@ -1,12 +1,11 @@
-from neo4j_graphrag.llm import LLMResponse, OpenAILLM
+"""This example demonstrate how to invoke an LLM using a local model
+served by Ollama.
+"""
 
-# not used but needs to be provided
-api_key = "ollama"
+from neo4j_graphrag.llm import LLMResponse, OllamaLLM
 
-llm = OpenAILLM(
-    base_url="http://localhost:11434/v1",
+llm = OllamaLLM(
     model_name="<model_name>",
-    api_key=api_key,
 )
 res: LLMResponse = llm.invoke("What is the additive color model?")
 print(res.content)

pyproject.toml

@@ -50,6 +50,7 @@ anthropic = { version = "^0.36.0", optional = true}
 sentence-transformers = {version = "^3.0.0", optional = true }
 json-repair = "^0.30.2"
 types-pyyaml = "^6.0.12.20240917"
+ollama = {version = "^0.4.4", optional = true}
 
 [tool.poetry.group.dev.dependencies]
 urllib3 = "<2"
@@ -69,6 +70,7 @@ pinecone = ["pinecone-client"]
 google = ["google-cloud-aiplatform"]
 cohere = ["cohere"]
 anthropic = ["anthropic"]
+ollama = ["ollama"]
 openai = ["openai"]
 mistralai = ["mistralai"]
 qdrant = ["qdrant-client"]

src/neo4j_graphrag/embeddings/__init__.py

@@ -15,13 +15,15 @@
 from .base import Embedder
 from .cohere import CohereEmbeddings
 from .mistral import MistralAIEmbeddings
+from .ollama import OllamaEmbeddings
 from .openai import AzureOpenAIEmbeddings, OpenAIEmbeddings
 from .sentence_transformers import SentenceTransformerEmbeddings
 from .vertexai import VertexAIEmbeddings
 
 __all__ = [
     "Embedder",
     "SentenceTransformerEmbeddings",
+    "OllamaEmbeddings",
     "OpenAIEmbeddings",
     "AzureOpenAIEmbeddings",
     "VertexAIEmbeddings",

src/neo4j_graphrag/embeddings/mistral.py

@@ -57,8 +57,7 @@ def embed_query(self, text: str, **kwargs: Any) -> list[float]:
             **kwargs (Any): Additional keyword arguments to pass to the Mistral AI client.
         """
         embeddings_batch_response = self.mistral_client.embeddings.create(
-            model=self.model,
-            inputs=[text],
+            model=self.model, inputs=[text], **kwargs
         )
         if embeddings_batch_response is None or not embeddings_batch_response.data:
             raise EmbeddingsGenerationError("Failed to retrieve embeddings.")

src/neo4j_graphrag/embeddings/ollama.py

@@ -0,0 +1,65 @@
+#  Copyright (c) "Neo4j"
+#  Neo4j Sweden AB [https://neo4j.com]
+#  #
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#  #
+#      https://www.apache.org/licenses/LICENSE-2.0
+#  #
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from __future__ import annotations
+
+from typing import Any
+
+from neo4j_graphrag.embeddings.base import Embedder
+from neo4j_graphrag.exceptions import EmbeddingsGenerationError
+
+
+class OllamaEmbeddings(Embedder):
+    """
+    Ollama embeddings class.
+    This class uses the ollama Python client to generate vector embeddings for text data.
+
+    Args:
+        model (str): The name of the Mistral AI text embedding model to use. Defaults to "mistral-embed".
+    """
+
+    def __init__(self, model: str, **kwargs: Any) -> None:
+        try:
+            import ollama
+        except ImportError:
+            raise ImportError(
+                "Could not import ollama python client. "
+                "Please install it with `pip install ollama`."
+            )
+        self.model = model
+        self.client = ollama.Client(**kwargs)
+
+    def embed_query(self, text: str, **kwargs: Any) -> list[float]:
+        """
+        Generate embeddings for a given query using an Ollama text embedding model.
+
+        Args:
+            text (str): The text to generate an embedding for.
+            **kwargs (Any): Additional keyword arguments to pass to the Ollama client.
+        """
+        embeddings_response = self.client.embed(
+            model=self.model,
+            input=text,
+            **kwargs,
+        )
+
+        if embeddings_response is None or embeddings_response.embeddings is None:
+            raise EmbeddingsGenerationError("Failed to retrieve embeddings.")
+
+        embedding = embeddings_response.embeddings
+        if not isinstance(embedding, list):
+            raise EmbeddingsGenerationError("Embedding is not a list of floats.")
+
+        return embedding