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Chroma provides a convenient wrapper around the OpenCLIP library. This embedding function runs locally and supports both text and image embeddings, making it useful for multimodal applications.
This embedding function relies on several python packages:
  • open-clip-torch: Install with pip install open-clip-torch
  • torch: Install with pip install torch
  • pillow: Install with pip install pillow
from chromadb.utils.embedding_functions import OpenCLIPEmbeddingFunction
import numpy as np
from PIL import Image

open_clip_ef = OpenCLIPEmbeddingFunction(
    model_name="ViT-B-32",
    checkpoint="laion2b_s34b_b79k",
    device="cpu"
)

# For text embeddings
texts = ["Hello, world!", "How are you?"]
text_embeddings = open_clip_ef(texts)

# For image embeddings
images = [np.array(Image.open("image1.jpg")), np.array(Image.open("image2.jpg"))]
image_embeddings = open_clip_ef(images)

# Mixed embeddings
mixed = ["Hello, world!", np.array(Image.open("image1.jpg"))]
mixed_embeddings = open_clip_ef(mixed)
You can pass in optional arguments:
  • model_name: The name of the OpenCLIP model to use (default: “ViT-B-32”)
  • checkpoint: The checkpoint to use for the model (default: “laion2b_s34b_b79k”)
  • device: Device used for computation, “cpu” or “cuda” (default: “cpu”)
OpenCLIP is great for multimodal applications where you need to embed both text and images in the same embedding space. Visit OpenCLIP documentation for more information on available models and checkpoints.