public static Tensor expandBitTensor(Tensor packed) {
        var unpacker = new UnpackBitsNode(new ReferenceNode("input"), TensorType.Value.FLOAT, "big");
        var context = new MapContext();
        context.put("input", new TensorValue(packed));
        return unpacker.evaluate(context).asTensor();
    }
Evaluate the embedding model if the result is not present in the context cache.

@param context the context accompanying the request
@param text the text that is embedded
@return the model output
model-integration/src/main/java/ai/vespa/embedding/ColBertEmbedder.java