Fix: mean_agg returning none-serializable numpy float64 (run-llama#11458

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llama-index-core/llama_index/core/base/embeddings/base.py

@@ -29,7 +29,7 @@ class SimilarityMode(str, Enum):
 
 def mean_agg(embeddings: List[Embedding]) -> Embedding:
     """Mean aggregation for embeddings."""
-    return list(np.array(embeddings).mean(axis=0))
+    return np.array(embeddings).mean(axis=0).tolist()
 
 
 def similarity(