Update README.md

README.md

@@ -8,21 +8,24 @@ pinned: false
 ---
 
 
-# 🗂️ LlamaIndex 🦙 (GPT Index)
+# 🗂️ LlamaIndex 🦙
 
 LlamaIndex (GPT Index) is a project that provides a central interface to connect your LLM's with external data.
 
-PyPi: 
+PyPI: 
 - LlamaIndex: https://pypi.org/project/llama-index/.
 - GPT Index (duplicate): https://pypi.org/project/gpt-index/.
 
-Documentation: https://gpt-index.readthedocs.io/en/latest/.
+Documentation: https://gpt-index.readthedocs.io/.
 
 Twitter: https://twitter.com/gpt_index.
 
 Discord: https://discord.gg/dGcwcsnxhU.
 
-LlamaHub (community library of data loaders): https://llamahub.ai
+### Ecosystem
+
+- LlamaHub (community library of data loaders): https://llamahub.ai
+- LlamaLab (cutting-edge AGI projects using LlamaIndex): https://github.com/run-llama/llama-lab
 
 
 ## 💻 Example Usage
@@ -38,20 +41,33 @@ To build a simple vector store index:
 import os
 os.environ["OPENAI_API_KEY"] = 'YOUR_OPENAI_API_KEY'
 
-from llama_index import GPTSimpleVectorIndex, SimpleDirectoryReader
+from llama_index import GPTVectorStoreIndex, SimpleDirectoryReader
 documents = SimpleDirectoryReader('data').load_data()
-index = GPTSimpleVectorIndex.from_documents(documents)
+index = GPTVectorStoreIndex.from_documents(documents)
 ```
 
-To save to and load from disk:
+
+To query:
 ```python
-# save to disk
-index.save_to_disk('index.json')
-# load from disk
-index = GPTSimpleVectorIndex.load_from_disk('index.json')
+query_engine = index.as_query_engine()
+query_engine.query("<question_text>?")
 ```
 
-To query:
+
+By default, data is stored in-memory.
+To persist to disk (under `./storage`):
+
 ```python
-index.query("<question_text>?")
+index.storage_context.persist()
 ```
+
+To reload from disk:
+```python
+from llama_index import StorageContext, load_index_from_storage
+
+# rebuild storage context
+storage_context = StorageContext.from_defaults(persist_dir='./storage')
+# load index
+index = load_index_from_storage(storage_context)
+```
+