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Chroma supports deleting items from a collection by id using .delete. The embeddings, documents, and metadata associated with each item will be deleted. 
collection.delete(
    ids=["id1", "id2", "id3",...],
)
.delete also supports the where filter. It will delete all items in the collection that match the where filter. 
collection.delete(
	where={"chapter": "20"}
)