Add support for Ollama embedding

Fixes DOC-821

Author: Nick Vigilante

apis/python/src/tiledb/vector_search/embeddings/__init__.py

@@ -2,6 +2,7 @@
 from .image_resnetv2_embedding import ImageResNetV2Embedding
 from .langchain_embedding import LangChainEmbedding
 from .object_embedding import ObjectEmbedding
+from .ollama_embedding import OllamaEmbedding
 from .random_embedding import RandomEmbedding
 from .sentence_transformers_embedding import SentenceTransformersEmbedding
 from .soma_geneptw_embedding import SomaGenePTwEmbedding
@@ -18,4 +19,5 @@
     "LangChainEmbedding",
     "SomaScGPTEmbedding",
     "SomaSCVIEmbedding",
+    "OllamaEmbedding",
 ]

apis/python/src/tiledb/vector_search/embeddings/ollama_embedding.py

@@ -0,0 +1,49 @@
+from typing import Dict, Optional, OrderedDict, Sequence, Union
+
+import numpy as np
+
+# from tiledb.vector_search.embeddings import ObjectEmbedding
+
+
+class OllamaEmbedding:
+    """
+    Embedding functions from Ollama.
+
+    This attempts to import the embedding_class from the ollama module.
+    """
+
+    def __init__(
+        self,
+        dimensions: int,
+        embedding_class: str = "embed",  # really it's the method
+        embedding_kwargs: Optional[Dict] = None,
+    ):
+        self.dim_num = dimensions
+        self.embedding_class = embedding_class
+        self.embedding_kwargs = embedding_kwargs
+
+    def init_kwargs(self) -> Dict:
+        return {
+            "dimensions": self.dim_num,
+            "embedding_class": self.embedding_class,
+            "embedding_kwargs": self.embedding_kwargs,
+        }
+
+    def dimensions(self) -> int:
+        return self.dim_num
+
+    def vector_type(self) -> np.dtype:
+        return np.float32
+
+    def load(self) -> None:
+        import importlib
+
+        try:
+            embeddings_module = importlib.import_module("ollama")
+            embedding_method_ = getattr(embeddings_module, self.embedding_class)
+            self.embedding = embedding_method_(**self.embedding_kwargs)
+        except ImportError as e:
+            print(e)
+
+    def embed(self, objects: Union[str, Sequence[str]]) -> np.ndarray:
+        return np.array(self.embedding(input=objects).embeddings, dtype=np.float32)