fix: Lazy load llamaindex imports that are causing issues (#2075)

letta/embeddings.py

@@ -3,18 +3,7 @@
 from typing import Any, List, Optional
 
 import numpy as np
-
-# from llama_index.core.base.embeddings import BaseEmbedding
-# from llama_index.core.embeddings import BaseEmbedding
-# from llama_index.core.base.embeddings.base import BaseEmbedding
-# from llama_index.bridge.pydantic import PrivateAttr
-# from llama_index.embeddings.base import BaseEmbedding
-# from llama_index.embeddings.huggingface_utils import format_text
 import tiktoken
-from llama_index.core import Document as LlamaIndexDocument
-
-# from llama_index.core.base.embeddings import BaseEmbedding
-from llama_index.core.node_parser import SentenceSplitter
 
 from letta.constants import (
     EMBEDDING_TO_TOKENIZER_DEFAULT,
@@ -26,6 +15,9 @@
 
 
 def parse_and_chunk_text(text: str, chunk_size: int) -> List[str]:
+    from llama_index.core import Document as LlamaIndexDocument
+    from llama_index.core.node_parser import SentenceSplitter
+
     parser = SentenceSplitter(chunk_size=chunk_size)
     llama_index_docs = [LlamaIndexDocument(text=text)]
     nodes = parser.get_nodes_from_documents(llama_index_docs)