private Embedder requireEmbedder(String embedderId) {
        if ( ! embedders.containsKey(embedderId))
            throw new IllegalArgumentException("Can't find embedder '" + embedderId + "'. " + embedderIds(embedders));
        return embedders.get(embedderId);
    }
A class which knows how to convert an Object value to a tensor of a given type.

@author bratseth
container-search/src/main/java/com/yahoo/search/schema/internal/TensorConverter.java